Re: printing arrays
Gerriet M. Denkmann wrote: 2012-...] Bad Array: ( \U0e01\U0e38\U0e0d\U0e41\U0e08, \U0e04\U0e38\U0e13\U0e04\U0e48\U0e32 ) For a very long time, the -description method of NSArray (and other collection classes) has produced the old-style ASCII plist format. Since that format has no direct representation for non-ASCII characters, the output is produced in escaped Unicode form. See the description of Representations here: http://en.wikipedia.org/wiki/Property_list I don't know if collections have always done this, but they've acted that way for so long that I don't feel motivated to boot up an old PPC Mac and track it back into the dawn of history. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Finder Info
koko wrote: I forgot to add that the deployment target is 10.4 … which is why I asked … Look at NSFileManager's deprecated methods, and find changeFileAttributes:atPath: . -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: How do I get memory usage numbers?
Charlie Dickman wrote: What I want to do is determine the ratio of inactive to free in order to determine when to execute the purge command to free up the inactive memory before the system gets into trouble. It's unnecessary to purge or free Inactive memory. Quoting from: http://support.apple.com/kb/HT1342 Inactive: This information is in RAM but it is not actively being used, it was recently used. For example, if you've been using Mail and then quit it, the RAM that Mail was using is marked as Inactive memory. EMPHASIS ADDEDInactive memory is available for use by another application, just like Free memory. However, if you open Mail before its Inactive memory is used by a different application, Mail will open quicker because its Inactive memory is converted to Active memory, instead of loading it from the slower drive. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Document Based Application
koko wrote: I have 29 file types and wanted to get away from the if or switch to open them and let NSDocument pick the right class for me. As I understand it, an Item in the Document types array of the plist contains and entry for an NSDocument class. And yes, each type has a unique extension (possibly multiple). I.e. type phobia has extensions pho, pho12, pho15 all mapped to NSDocument subclass MYPhobia. Use an NSDictionary. The key is the file extension. The value is the subclass name, or the actual Class object. Cost is one dictionary lookup. Plus it's extensible, and can be revised without altering code. You can also add a level of indirection. The key is still file extension, but the value is a number (int). Use the number as an index into an NSArray of classname strings, or the actual Class objects. The dictionary and/or array can be stored as plists in your app's Resources sub-dir. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: byte orders question
Koen van der Drift wrote:
u_int32_t value;
[base64DecodedData getBytes:value range:NSMakeRange
(n*4, sizeof(u_int32_t))];
u_int32_t res = CFSwapInt32HostToBig(value);
float f;
memcpy(f, res, sizeof(f));
NSLog(@%f, f);
Since you're just doing a memcpy(), you can simply cast the bits and
avoid the copying. Try this:
float f = *((float*) res);
Or try defining a C union:
union foo { float f; u_int32_t u; };
union foo bar;
bar.u = CFSwapInt32HostToBig(value);
float f = bar.f;
-- GG
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Re: Calling a Cocoa library from C
Nathan Sims wrote:
Hmm, if not a global, where would the declaration go? The C
function certainly shouldn't return it, so if it is to remain
persistent across calls, wouldn't the logical (the only?) place for
it be as a global in the library's .m file?
Why shouldn't the C function return it? As far as C is concerned, an
object pointer is just an opaque pointer. Handle it like any other
opaque pointer.
Example:
void * setup_data()
{
return (void *) [[ObjcCode alloc]init];
}
int get_float_data( void * ptrFrom_setup_data, float *result1, float
*result2)
{
ObjcCode *obj = (ObjcCode *) ptrFrom_setup_data;
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
[obj call];
*result1 = [more stuff];
etc.;
[pool drain];
return 0;
}
void quit_data( void * ptrFrom_setup_data )
{
[(ObjcCode *)ptrFrom_setup_data release];
}
-- GG
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Re: Blocks vs. life, the universe and everything
Quincey Morris wrote: The problem is that the documentation clearly states that exceptions must not try to escape across dispatch queue operation boundaries. AFAICT, this means that for every one of the tiny code block fragments I write, not only does my fragment need to be wrapped in a '@try' block, I must also deal with the exception by (say) logging its description before leaving the block. Every time. That seems like an awful lot of boilerplate code, and it makes the blocks-based approach very unpalatable. Suppose an @try was required at all times. One logical approach would be factor it out, instead of pasting in boilerplate code. Factoring suggests writing a new function that takes the same args, but which wraps the incoming block inside another block that has @try/ @catch. Just thinking out loud. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: -dateWithTimeIntervalSinceNow: 64-bits may overflow
Jerry Krinock wrote: Not necessarily. Multiple overflows tend toward a random number generator. Doubles overflow to +INF, as do floats. Arithmetic on INFs typically yields one of the INFs (+INF or -INF). It is decidedly non-random. It would be an interesting experiment, though. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: How to get mount options of a mounted volume
Oleg Krupnov wrote: I'd like to get the mount options of a particular volume (like rw, nobrowse, automounted etc.) of a mounted volume, like those I get when I run mount command in the Terminal. See the C function statfs(). See the include file sys/mount.h, struct statfs, member f_flags. See the Darwin source for the 'mount' command. But only if NSWorkspace getFileSystemInfoForPath doesn't return enough info. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: diskutil info -plist via Cocoa object?
Todd Heberlein wrote: If not, does anyone know how is diskutil getting this information? For example getfsstat(), statfs(), ...? I'm having troubles finding the equivalent of BusProtocol and Internal values in these structures. BusProtocol is probably worked out from the device pathname (/dev/ something). That's in struct statfs as f_mntfromname. There's probably some munging to turn that path into an IOKit node, and from that, one of the ancestor nodes would identify the bus. For example, look at the plist keys that contain Device as a prefix. The DeviceTreePath key has a value that identifies things like PCI and SATA (on my machine). -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: creating multiple NSTimers
Gordon Apple wrote: There must already be an array for the table, so just iterate the array every minute or whatever (single repeating timer), compare the times to [NSDate date} and start or shut down whatever has not been started or shut down. Much easier than trying to manage timers. You don't have to iterate the whole array, either. Sort it by ascending order of turn-off time. Keep a current position (index). If the time of day is less than the turn-off time of the device at the current position, do nothing. If time of day = turn-off time of current position, then turn it off and advance position until time of day is again less than the turn-off time of device at the current position. Only needs one timer, and scales to as large an array as you want to keep. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Why does Xcode define IBOutlet with @synthesize?
Charles Srstka wrote: It’s a little disturbing that private instance variables can be altered so easily, but then I suppose the same thing could just as easily be done by a third-party monkeying with the ivar in a category. No programming language with direct memory access is ever entirely safe. And one that's defined as a strict superset of C can't ever be more safe than C itself is. Since C lets you typecast pointers indiscriminately, that's a pretty big barn door to close after the horses have bolted. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Task dispatching
Jon Sigman wrote: Also, won't I need to increase shmmax in the kernel, especially if I have numerous flavors of the 1GB matrix to load? What is a flavor of a matrix? You need to explain what you're doing in terms of the data and its representation. How is the matrix data represented on disk? How does it need to be represented in memory? How does a matrix's flavor affect its representation on disk and/or in memory? For example, if every load of the matrix from disk to memory parses from textual representation to double representation, then you might be able to save a lot of time by parsing it once, writing the double representation to disk, then using mmap() or some other mechanism to load that file. That's just an example. I'm guessing at representations and at what needs to be done. Without knowing exactly what your data representation is, and what needs to be done with it in memory, guessing at possible solutions isn't worth anything. http://www.perlmonks.org/index.pl?node_id=542341 .. You want to do X, and you think Y is the best way of doing it. .. Instead of asking about X, you ask about Y. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Follow-up on localizing Keychain names
Sean Leonard wrote: Does anybody know how the display names for these keychains are localized, and how I can use this behavior for another keychain? What have you tried? Maybe it's the same way other file-system names are localized: http://developer.apple.com/library/mac/#documentation/MacOSX/ Conceptual/BPInternational/Articles/LocalizingPathnames.html -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Writing global preferences file into /Library/Preferences (OS X Lion)
Peter C wrote: Graham, I used to store serial number codes for all users, in this directory. Looks like I have change it to save it user library directory. The /Users/Shared/ directory is public-writable, with sticky-bit set (unless that changed in Lion, too). See 'man sticky' for an explanation of the sticky-bit. See the sample code CFPrefTopScores for example code. The convention is to create a sub-directory there, not write files directly into /Users/Shared/. If you put a globally readable file there, and you want any user to be able to modify it, be sure to apply the correct permissions to the sub-dir and to the prefs file itself. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: problem with dataWithContentsOfFile on Lion
Wilker wrote: Before Lion, it really works well and fast, even on Wifi external drive (through Airport Extreme), but now it get's really slow... I did some checks, and now its reading the entire file... instead of just read 128kb (start and end). Anyone have an ideia on why its happening now? And how to make it works as before on Snow Leopard? You could use fopen(), fseek(), fread(), fclose(). Who knows, it might even be faster, since it doesn't have to call mmap (). Worst case, you call mmap() yourself. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Optimizing a loop
Eric E. Dolecki wrote:
//Get the very best match there is to be found for
song.
if(match currentFoundValue){
currentFoundValue = match;
test = [songsDictionary objectForKey:thisSong];
dis = [NSArray arrayWithObject:test];
collection = [[MPMediaItemCollection alloc]
initWithItems:dis];
}
}
You never release the 'collection' variable in the surrounding 'for'
loop, so if there happens to be more than one candidate match during
the search, you'll leak all but one MPMediaItemCollection object.
Personally, I'd just defer the array-making (dis) and collection-
making (collection) until after the 'for' loop finds the closest
match. Only do those things in the loop that are relevant to the
loop: which is finding the closest matching MPMediaItem. If it's not
relevant to that search, defer it until after the closest match is
found.
BTW, if you haven't profiled your code, you should do that first,
before making any changes at all. You haven't posted any evidence
that the fuzzy matching of your StringDistance class is the cause of
the performance problem. It could just as easily be the making of
dis and collection that's the problem. Or it could be that the
problem is better solved by improving the code of StringDistance
(which you haven't posted). There's no way of knowing without
profiling first.
-- GG
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Re: Adding Spotlight comment data to folder/file
Kevin Muldoon wrote: Well, as I indicated, it's only a bit of icing on the cake. I'm just a bit shocked such an trivial task in a scripting language requires such heavy lifting in Obj-C (or more accurately, C). The Finder's spotlight comment is stored as an xattr attached to the file. To test: make a file, add a comment to it in Finder's Get Info window, then in Terminal: xattr -l /path/to/commentedFile The xattr name is com.apple.metadata:kMDItemFinderComment. The contents is a bplist (binary plist) containing the comment data. Maybe google the xattr name for more info. Also see the output of 'xattr -h' (xattr cmd's builtin help summary). There are C functions for working with xattrs, which I've found were quite easy to use. See 'man getxattr' and then check the other xattr functions listed under SEE ALSO. Also check the output of: 'apropos xattr'. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: App Delegate Methods
koko wrote: So, is there really an NSApplicationWillFinishLaunchingNotification or is Apple just pulling my leg? From the reference doc for the NSApplicationDelegate protocol: applicationWillFinishLaunching: Sent by the default notification center immediately ***before the application object is initialized***. (*'s added for emphasis) What do you hope to accomplish with this event that you can't accomplish with applicationDidFinishLaunching: ? -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Using a Soundex category...
Eric E. Dolecki wrote: http://www.cocoadev.com/index.pl?NSStringSoundex However, when I tried it out I get strange results... //someString is set to different strings each time tested BOOL test = [someString soundsLikeString:@Face]; NSLog(@sounds like Face: %d,test); Place = 0 Ace = 0 Mace = 0 Fake = 1 Testing = 0 Brake = 0 It would seem something is off to get negatives on Place, Ace Mace. There's this comment in the -soundexString method: Replace consonants with digits as follows (but do not change the first letter): b, f, p, v = 1 c, g, j, k, q, s, x, z = 2 d, t = 3 l = 4 m, n = 5 r = 6 Collapse adjacent identical digits into a single digit of that value. Remove all non-digits after the first letter. Return the starting letter and the first three remaining digits. If needed, append zeroes to make it a letter and three digits. Assuming the code works as the comment says, and you should read the code to confirm this, then it doesn't change the first letter. So it seems to me that Face won't match place, ace, or mace. Maybe you could print the value of the -soundexString method instead of blindly relying on the boolean of soundsLikeString:. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: dealloc and scarce resources
James Merkel wrote: Everyone doesn't approach this stuff with the same background. We find from Kernighan and Ritchie (KR) second edition, section 8.1 that a file descriptor is a small non-negative integer that refers to a file and is maintained by the system. Wikipedia is also a useful reference. When I select the words file descriptors on a web page, contextual- click it (right click, secondary click, control click), then choose Search with Google from the contextual menu, Wikipedia's page is the top hit. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: dealloc and scarce resources
Jeffrey Walton wrote: Wikipedia is hardly the definitive reference. SEO comes to mind. Luckily, I didn't say Wikipedia was a definitive reference. I said useful reference. And anyone at all familiar with it knows full well that its accuracy (and usefulness) can vary widely. I, for one, would never use it as a definitive reference for any algorithm, though I may well use its links at the end of an article to begin my search for definitive references. My main point was more that there is a very easy way to search for unknown terms that one encounters when reading documentation on the web. This is on the same level as pointing out that nearly every reference page on developer.apple.com has Feedback buttons at the bottom of the page, where complaints about unknown terms can easily be filed. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: tableView: objectValueForTableColumn: row: method not getting called
Sandeep Mohan Bhandarkar wrote: Have i missed anything else...?? All the protocol's methods are declared @optional. That means the compiler won't check whether you've spelled your implementation's method-name correctly. I have seen more than one case where it was misspelled, despite an absolute certainty it was correct. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Automatically mirroring folders
Leonardo wrote: 2) During the period of time the stream is off, if some new files arrive within the folder /A, I lose the notification to copy it. How to workaround that? Make a directory adjacent to /A and /B to use as a staging area for copying. Only copy into the staging area. http://en.wikipedia.org/wiki/Staging_area When the copying of a file is complete, get its inode number. Then rename the copy from the staging area into the actual target folder. After the copying is complete, and the rename is ready to occur, ignore all events that have the file's inode number. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Retrieve NSTable DataSource from AppController
Kevin Muldoon wrote: I have an NSTable which receives its dataSource from MyTableController.m. However, my AppController.m needs the data MyTableController.m holds. Since AppController.m hasn't explicitly instantiated MyTableController (MyTableController being an NSObject within IB with appropriate delegates and such) how does AppController.m access MyTableController.m data? Thanks for the help. How many MyTableController instances will there be at once? If it's one, then you can use a Singleton pattern rooted in AppController. Simply make AppController own and manage the data source object (i.e. the Model for the table's View). AppController is already a singleton (presumably), so giving it the responsibility for other application-wide singletons isn't crazy. MyTableController then calls on the single AppController instance to obtain the data source object. If there are multiple MyTableController instances at once, then you can have them register themselves with the single AppController when they are opened, and also unregister when closed. AppController maintains a collection of these, and depending on which table data source it wants, uses some mechanism to identify the corresponding MyTableController. An example mechanism might be sequence number (1, 2, 3), name, etc. stored as keys in a dictionary, where the value is the MyTableController instance. You can use the register/unregister approach if there's a single MyTableController, too, but it's more complex, and there's no need when a perfectly good Singleton relationship will work. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Release a NSWindowController after the window is closed
Matt Neuburg wrote: Why are we able to do that? m. Because ARC is public knowledge: http://clang.llvm.org/docs/AutomaticReferenceCounting.html -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Parent-child Design Pattern
Martin Hewitson wrote: What I'm unsure about is, how to deal with the children objects. I will, in principle, have a ChildView. This raises some questions: 1) Should I have a ChildViewController class? I don't think there's a single answer. Parent/child relationships can be presented in many ways. For example, see here: http://designingwebinterfaces.com/designing-web-interfaces-12-screen- patterns Many of those designs have some form of hierarchical data models, yet the views and view controllers may not have the same structure. You should figure out what the view relationships are, then design view controllers accordingly. The role of the class is a VIEW controller, not a MODEL controller; it doesn't have to mirror the MODEL's structure. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Mac OS Leopard: how to spawn an child application?
Nick wrote: This per user idea does not let me use any advertisement-based IPCs (like user domain sockets or bonjour). I need some per user only IPC - so other user's instance of the process does not interfere with the current user's one. A Unix domain socket can be placed anywhere in the file-system, AFAIK. So put it in the user's home directory, probably best in a sub-dir like ~/Library/Application Support/YourAppNameHere/. A location under user's home dir also ensures that access permissions are applied when addressing the socket. The name need not be advertised if both parties already know its pathname. http://en.wikipedia.org/wiki/Unix_domain_socket UNIX domain sockets use the file system as address name space. Also, Bonjour service type names may incorporate unique identifiers. For example, the user-name or user id, or a GUID known to both parties. (Obey limits on service type name length, and consider vulnerability to spoofing attacks.) -- GG___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: How disable Special Characters menu item?
McLaughlin, Michael P wrote: I have a Cocoa app (Xcode 3.2.6) which displays text output in a window. This is pure output not meant to be edited by the user. Accordingly, the textfield is marked as not editable or selectable in IB. Speaking as a possible user, it is often useful to be able to select text and copy it to the clipboard, even if the text is pure output and isn't editable. For example, Terminal.app allows this for all the text displayed in a shell window. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Why does NSArray count return NSUInteger?
julius wrote: My question is Why did Cocoa developers make NSArray count return NSUInteger? It's impossible to answer with certainty. The person or persons who made that decision are not on this list (AFAIK). Nor have they documented the rationale behind their design decisions for posterity. Several hypotheses have been proposed. The simplest one is that the returned type is consistent with the parameter types of all the other methods that have an index parameter. You have countered with reasons why the various hypotheses are not compelling (in your opinion). Others have countered with reasons why your reasons are not compelling (in their opinion). Your taste is not theirs, nor is theirs yours. In a practical sense, none of this matters. The decision was made long, long ago. It is what it is. You're too late to save that sheep from drowning. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: add crlf to UITextView
koko wrote: I had changed the string I was appending to @\n\nText to Add which also did not work. You need to identify whether your string is a literal string in your Objective-C source, or whether it's something loaded from somewhere else. If it's loaded from somewhere else, you need to identify whether it contains the literal characters backslash-Small-Letter-R-backslash- Small-Letter-N, or whether it contains the actual character codes for CR and LF. You can do all these things by writing some code that dumps out the hex representations of every unichar in the string you are about to append. Put this code immediately before the point where you call stringByAppendingString:. Post what the hex output is. If your string is a literal @\n\nText in an Objective-C source file, then that should be getting converted to LF-LF-Text, because the compiler will convert backslash-escaped characters. Refer to the C rules on backslash used as an escape character in strings. If you're not compiling the string with some kind of C compiler, then backslash has no special meaning, and what you will get is a literal backslash. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Recursive search for files
James Merkel wrote: I was trying to come up with a way to prevent the user from starting at the wrong place. (Putting up an Alert that says you can't start there). There's a method in the NSFileManager class called isDeletableFileAtPath. I am thinking that all of those volumes and higher level directories that I want to avoid are not deletable. Therefore I could use this as a filter. You should test that assumption. Test it when logged in as both a non-admin user and an admin user. You might be surprised. You also might be surprised if Apple changes anything in permissions, ACLs, etc. and suddenly you get a whole lot more files than you planned for. So the whole premise seems a little shaky to me. I'm not sure why you can't allow the user to start at the volume level, if by that you mean the root filesystem whose pathname is /. If you want to limit depth, give the user a control to limit depth. If you want to limit number of files, give the user a control for that. Set reasonable defaults, but otherwise don't artificially limit what users can do. You don't know how they've setup their storage, and arbitrary limitations are obnoxious. If your concern is traversing every mounted volume, there's an easy way to detect that: it's the device-id in the struct filled in by stat () (see man page for stat(2)). You don't have to decipher the device- id, you just have to check for a change in device-id to some value that differs from the device-id of where you started. For an example of controlling depth, traversal of volumes, etc. look at the man page for the 'find' command. There are also readable attributes (flags and xattrs) that can offer clues as to whether a directory is hidden from the GUI or not. See man chflags, and man xattr. The idea here is to not traverse hidden dirs unless the user says it should. Some of these are also available as Spotlight metadata, so read up on that, too. And don't put up any alert that says You can't start there. Simply dim or don't show any items that should not be traversed. Few things are worse than a cycle of You can't do that alerts, when the proper course is to only show things that can be done. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Communicate Between CocoaAsyncSocket and Java Socket
Bing Li wrote: I believe TCP can be used between Java and iOS. However, I worry that particular serialization exists in CocoaAsyncSocket so that Java cannot deserialize successfully. Do you think the issue exists? No. If there is an issue, it's almost certainly in your code. First, I have used CocoaAsyncSocket to communicate with Java sockets, and had no problems. I have sent and received binary data, lines of text, JSON data, and XML data. It all worked fine. Second, CocoaAsyncSocket doesn't have any particular serialization. It's just a socket, and it works with bytes in NSData. There is no other serialization, other than the in-memory layout of multibyte data structures you pass to and from NSData. If you don't know exactly what the in-memory structure of the NSData bytes is, then you don't really know what you're sending or receiving. If your Java code needs a particular serialization, then that's because your Java code is written a particular way. The CocoaAsyncSocket must serialize data the same way. If you change the Java code to produce or expect some other serialization format, then your CocoaAsyncSocket code must match it. You will need to define the order of bytes in your protocol, by which I mean the order of bytes in the messages or streams exchanged between the two sides. If you don't define the order of bytes, then there is no clearly defined common ground between the two sides. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: How to detect string encoding before reading a file in NSString?
Laurent Daudelin wrote: I've found different ways to do that (some pure Cocoa, some using Carbon) but I was wondering about the wisdom of this list as to what is the best way to detect the encoding of a file before passing it to NSString initWithContentsOfFile:encoding:error:? You might not have to guess at all, if the file has an xattr of com.apple.TextEncoding attached to it. I don't know if any of the NSString encoding-guessing methods use this xattr or not. It's easy to test, though: TextEdit.app writes the xattr when you Save As and choose an encoding. The contents of the xattr is a text-encoding name (such as utf-8), then a semicolon, then a longish decimal number. You can see a file's xattrs with the xattr command in Terminal. Type 'xattr -h' for a summary of options and args. The xattr API works great in C (BSD functions, exist since OS 10.4 Tiger). Google search terms: xattr site:developer.apple.com -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Looking for help scanning entire drives
Laurent Daudelin wrote: I need to write an application that will scan entire drives and compare files between the 2 drives. man rsync See the --dry-run, --stats, and --progress options in particular. rsync can also run as a daemon, which may be easier than trying to control it with NSTask. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: inter-process locks
Alexander Cohen wrote: Is there anyway to do interprocess locks using cocoa ( like a Mutex in Win32 )? The best i've found is not cocoa and uses flock but the man pages say its advisory only which is kindof scary. man semget man semop man semctl They're part of the Posix IPC functions, so obviously work across processes. Like other Posix IPC functions, the proper use of the semaphore functions can be inscrutable. I recommend searching for working examples rather than puzzling it out from man pages alone. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: -[NSSet containsObject:] returns NO when it should return YES
Michael Crawford wrote: The following gdb console output demonstrates an instance of a media-item persistent-ID property that, when queried gives a large unsigned number. When I ask again using the -longLongValue method, I get the answer I was expecting. When I look inside the set, you will see that the value -1748299021286640132 is in the set. However, when -containsObject is called, it returns NO. If the persistent-ID is unsigned, then longLongValue seems like the wrong type to use. There are NSNumber methods for working with unsigned long long types. Try using those exclusively and see if it changes anything. NSNumber has a method that returns the type encoding as a C string (- objCType). The long long type has a different value from the unsigned long long type: q vs. Q. There's also this special consideration (see NSNumber class reference doc): The returned type does not necessarily match the method the receiver was created with. http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ Foundation/Classes/NSNumber_Class/Reference/Reference.html%23// apple_ref/occ/cl/NSNumber The type encodings reference: http://developer.apple.com/library/mac/#documentation/Cocoa/ Conceptual/ObjCRuntimeGuide/Articles/ocrtTypeEncodings.html%23// apple_ref/doc/uid/TP40008048-CH100-SW1 If nothing else works, convert the persistent-ID number to NSString, using an encoding like BASE64 or simply hex in a consistent upper or lower case. I doubt that the performance cost for a string would be so high that making your own NSValue subclass would be worthwhile. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: readInBackgroundAndNotify and rsync output
Robert DuToit wrote: I have been googling around and not sure how to do this - is it with NSData or NSStream perhaps? You can use standard C's stdio lib: fopen(), fread(), fseek(), etc. Objective-C is a superset of C. You can use any C library in Objective-C, exactly the same way you'd use it in C. One advantage of using stdio is you can easily find tutorials, examples, etc. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: lots of find/replace in text file
Jeremy Matthews wrote: I can't help but think there might be a better (and more efficient way) of handling this? How much better (and more efficient) does it have to be? It's a simple game, right? Is it currently too slow or memory- consuming? If not, why change it? If you want a different design for some reason, maybe look into doing the template-file parsing only once. Break it into a sequence of literal strings and replaceable strings in an NSArray. To produce output, walk the array and output either a literal string or a replaced string at each element. Or make a mutable copy of the array and use componentsJoinedByString: after replacing the replaceable items with their replacement strings. That won't necessarily be better or more efficient, just different. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: sending data to a view not yet displayed
Shane wrote: So I guess my question is, how do I make sure my view is able to receive the data I want sent to it before it is ever displayed. I hope that makes sense. Send the data to a Model, not a View. If the View and Model are the same object, then the only way to have a Model is to have a View. If you separate View from Model, then you can create a Model once (or whenever it's needed), and send it any data. It then provides its data to any View that wants it, whenever the View wants it (typically, initialize the View from the Model's data in awakeFromNib). If the View goes away (dealloc'ed), the Model remains. Or if the Model represents a Document, the Model goes away, too. To start making a separate Model, go through your View and ViewController classes and decide whether each method, property, or stateful item is part of the logical structure or the visible structure. Logical structure is what the program represents regardless of how it's presented. Visible structure is graphics, windows, etc. If you change something in the logical structure, the program's capabilities change. If you change something in the visible structure, that changes how it looks, but the capabilities are the same. Example: you can have a huge visible structure consisting of dialogs, palettes, pickers, etc. for setting and applying a font to a single string of text. The logical structure is much simpler: there is a chosen font and there is a single string the font is applied to. The Model has a string and a font. Everything else is part of the View and/or ViewController. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSDictionary key types
Jon Sigman wrote: The underlying issue I was having was how to know when different objects used as keys might be reasonably expected to match, especially if they weren't generated the same way (as with [NSNumber stringValue] and [NSString ...]). That's easy: they match when isEqual: returns true. See the NSDictionary class reference: http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ Foundation/Classes/NSDictionary_Class/Reference/Reference.html Find isEqual on the page: ... no two keys in a single dictionary are equal (as determined by isEqual:). This subtly suggests that key equality is synonymous with isEqual:. There is also a logical relationship between hash and isEqual, which must be maintained. Objects that are equal must also have equal hashes. Or: equality presupposes hash-identicality. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: XML to Plist
Sandro Noël wrote:
- (NSDictionary *) plist{
NSMutableDictionary *resultDict = [[[NSMutableDictionary alloc]
init] autorelease];
if ([self hasChildren]){
NSMutableArray *child = [[[NSMutableArray alloc]init]
autorelease];
for (OSXMLElement *element in _children){
// if thiselement has children add them to an array
[child addObject:[element plist]];
}
[resultDict setValue:child forKey:_elementName];
}
// just a regular node.
else {
[resultDict setValue:_elementText forKey:_elementName];
}
return resultDict;
}
If you don't want nodes stored in an array, then don't use
NSMutableArray.
I think you need to step back from the coding and do a better
analysis. At each step of the logical analysis, given a type of XML
node as input, write down exactly what actions should occur for the
desired output. Don't write code, just write down brief action
descriptions.
For example, I see no arrays in your desired output, so there
shouldn't be any need for creating an array. If you don't create an
array for children, analyze what is needed instead.
You could also benefit by doing an analysis (i.e. write action
descriptions) of the code you have now. When you get to the part
that says Create array. Fill it with every child, think about what
that means.
FWIW, this isn't a Cocoa problem, it's a logic problem. Get the
logic right first, then the Cocoa code should be plain.
-- GG
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Re: XML to Plist
Sandro Noël wrote: the glitch that breaks all my current logic is when there are elements with the same name at the same level. for instance in a RSS, rss chanel item item item this breaks the logic I can apply to a NSDictionary, because the previous item gets overwritten with the current one. That is why I've attempted to put them in array's but that had adverse effects also. The obvious omission in your code is a conditional test. You have to examine the child nodes first, to determine WHEN THERE ARE elements with the same name at the same level (your statement from above, my capitalization). WHEN THERE ARE such nodes, it should do one thing, WHEN THERE AREN'T, it should do another. All the code you've posted does the same thing unconditionally in both cases. Your code has neglected to act on the conditional WHEN THERE ARE ..., even though the conditional statement is there in what you wrote. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Encoding UIViews take long time..
Gustavo Pizano wrote: Any way to improve even more performance?, when I have many many BCItemView on the scene, (around 120+), it takes like 10 seconds to save. :S Measure where your code spends its time by running it in Instruments.app and using the Time Profiler. Use the measurements to tell you which parts of the code need improvement. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: label color
Ariel Feinerman wrote: How to get label color before 10.6? If you mean using Interface Builder, select a label, choose Attributes on the Inspector panel. Also notice the class of the label: NSTextField. Then look in NSTextField.h: - (void)setBackgroundColor:(NSColor *)color; - (NSColor *)backgroundColor; - (void)setTextColor:(NSColor *)color; - (NSColor *)textColor; -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Releasing static variable concurrent data protection questions...
Frederick C. Lee wrote: 2) Static variables on stack -- I was aware of this. Static and on stack are mutually exclusive. It's impossible to have a variable that is both, so static variables on stack is nonsense. BTW, the C storage specifier for on stack is auto. You might want to look at a C reference book and learn the difference between the static and auto storage classes. You can have a static pointer that points to a stack (auto) location. This will invariably fail, and is simply wrong on any semantic level. That's because auto lifetime is limited to a function's lifetime; when the function returns all auto variables die. You can have a stack pointer (i.e. auto pointer) that points to a static location. There is nothing inherently wrong with this, unless you're expecting thread-safety. If you intend to perform concurrent calculations, I suggest read-only inputs (sharable without locking), and single-writer outputs (unshared, hence no locking needed). If the outputs must be delivered to a common location, such as a queue, then that (i.e. the queue) can be locked, but only for the duration of queueing the results data. If you employ locking, you can quite easily lose any concurrency gains by having contested locks. Then your threads are spending all their time coordinating access, instead of doing work. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: instance fails in its own class
N!K wrote: However, exactly the same statement fails when pasted into -init of Class.m. Build yields warnings Class may not respond to -new. This message suggests you're calling an instance method, not a class method, or that's the way the compiler is interpreting it. Post your actual failing code, in the complete method where it fails. For example, is your class really named Class? If so, then that won't work. The reason is that Class is already a defined type, and it doesn't descend from NSObject. See the return type of the NSObject method -class. Look it up in The Objective-C Programming Language reference doc, under the heading Defined Types, or see the include file objc/objc.h. Furthermore, since +new is defined as +alloc followed by -init, calling +new in -init seems a little recursive to me, but without seeing actual code, it's just a guess. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Synchronizing iOS redraw
Rick Mann wrote: Note that the precision of all this isn't so high as to make this hard real time. It just has to be good enough that a person watching the display and comparing it (visually) to an accurate clock would consider them to be synchronized. I'd like to do no worse than 100 ms. Any ideas? I can tell you from experience that 100 ms will be visually noticeable. More than you might think. In any case, to get the display to update ON the second you'd have to change the labels and such BEFORE the second actually occurs. And you'd have to account for any discrepancy between the software's clock and the unidentified accurate clock. If the software doesn't know what the accurate clock is, how would it know its accuracy, so how could you know that a person won't see a difference, even if the display is exactly on the second? -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSFileManager and Resource Forks
koko wrote: NSString *outPath = [nspath stringByAppendingString:@/..namedfork/ rsrc]; ok = [fm createFileAtPath:outPath contents:data attributes:nil]; This won't work. You must first create the file (i.e. create the data fork). Only after the file exists can you open and write to its resource fork using the namedfork notation. This is true even if the data fork is intended to be empty, of length zero. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSFileManager and Resource Forks
koko wrote: although I have implemented a different solution, just to note the data fork (the file) does exist, it is nspath in the first line. I don't see nspath being used to create a data-fork file in any code you posted. It may be in the code you didn't post, or if I've missed it, please point it out. I also realize I wasn't clear. After the file exists, i.e. after the file has been created WITHOUT a namedfork pathname, it's wrong to use createFile on the resource fork. You can, however, open the namedfork for writing. I have done this using C stdio (FILE*) and it worked fine. Obviously, that's not one of the NSFileManager functions. Finally, the most recent code you posted is leaking the malloc'ed buffer holding the resource-fork's bytes. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: fork/exec vs NSTask
eveningnick wrote:: Basically this is the question about using fork in MacOS. But if there are other ways to launch a process, i'd appreciate if someone shared :) Maybe setup a launchd plist specifying the target executable you want to run, then ask launchd to run it by executing the 'launchctl' command in an NSTask. The plist can be generated dynamically if needed. One reason for doing this with launchd is it will take care of a lot of bookkeeping for you. There are also a lot of different conditions and launch options that can be embedded in a launchd plist. See 'man launchd.plist', and also TN2083 Daemons and Agents: http://developer.apple.com/mac/library/technotes/tn2005/tn2083.html If your target app has a GUI, it's an agent. If it has no GUI at all, it can be a daemon or an agent. Read TN2083 for more details; a *LOT* more details, including some that affect use of fork/exec. And since you said you don't have a lot of experience in Mac programming, maybe you can explain why you think fork/exec is the most appropriate solution. For example, list your requirements, your inter-process communications, etc. Maybe Distributed Objects is more appropriate, but no one would ever suggest it without knowing what you're trying to do. -- GG -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSError help
Dave Carrigan wrote: This is fine, although the code in the else is useless. It won't be fine if err is nil. That's another Cocoa idiom: if the NSError** is nil, then no NSError* is returned. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSDictionary allValues not mutable
Trygve Inda wrote: Or does NSArrayController somehow bind to a non-array property, but one that responds as if it were an array? Later in my original post, I suggested subclassing NSMutableArray, so it can bind to NSArrayController. Your new class, i.e. MyDataClass, doesn't just respond *as if* it were an array, it *is* an actual subclass of NSMutableArray, albeit a specialized one. The visible relationship between MyDataClass and NSMutableArray is *is-a*, not *has-a*. Internally, MyDataClass keeps both an NSMutableArray (to provide the array behavior), and an NSMutableDictionary for fast searching. You need to override the minimal methods of any NSMutableArray subclass, so it essentially forwards to the internal array. You also override the add/remove methods so objects are added/removed from both the internal array and the internal dictionay. You then override any of the find or search methods to use the internal dictionary. Or you can add new methods that perform this fast search, and call those when you need fast search as distinct from linear search (a formal protocol is optional). If you have a singleton class whose method you bind to, it could be declared as returning NSMutableArray, but it would actually return an instance of MyDataClass, i.e. your search-enhanced subclass of NSMutableArray. In other words, you arrange the classes and bindings so NSArrayController gets an instance of your specialized data- container, instead of an instance of a generic array container. The singleton whose method you bind to can be another class, or it can be an instance of MyDataClass itself. In the latter case, the binded method simply returns self. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSDictionary allValues not mutable
Trygve Inda wrote: Each dictionary (or object with properties) will need to hold roughly 9 textual strings, and there will be on the order of 10,000 objects in the array. I am guessing that dictionary will perform better than a predicate filter given the number of objects. Never guess at performance. Always measure. For one thing, perform better may be irrelevant. Good enough is the only criterion worth evaluating. If worse performance is good enough, then better performance serves no purpose (ignoring other tradeoffs, such as power consumption). If array search is 10 msecs, and dictionary search is 10 usecs, the user will never perceive the thousand-fold difference if the search occurs at most 10 times per sec. In addition, if the objects are ordered in the array, a binary search instead of linear is simpler than managing a parallel dictionary for keyed retrieval. Binary search is O(log2(n)) worst-case. http://en.wikipedia.org/wiki/Binary_search_algorithm It almost seems like you're choosing representations and algorithms primarily on the existence of classes, instead of what might work best. That is, because predicate filter classes exist, you don't have to write that class, so you've decided to use it for searching arrays instead of other algorithms that may have substantially better performance, but for which you'd have to write non-trivial code (or find it on the web). And the only tradeoffs you're making are between varieties of existing Apple-supplied classes, e.g. NSDictionary vs. NSArray with predicate-search, rather than looking for third-party classes. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSDictionary allValues not mutable
Trygve Inda wrote: This is probably true since this is a very minor part of my app... I simply need an array to display in a table with the added functionality of being able to locate a record uniquely (each object in the array has a unique ID as one of it's properties). I recommend doing the simplest thing that could possibly work, then measuring performance of that before making any other changes, or even thinking about changes. If simple array searching is fast enough, then you've already wasted time by thinking about how to use a dictionary, posting on the list, etc. Furthermore, there are simple additions to linear search of an ordered array that can greatly improve speed. For example, copy the search-keys of every 100th element into another ordered array. Search it first to decide where to start a linear search in the main list, and it's guaranteed you won't have to scan more than 100 main elements. This is effectively a type of tree structure for searching, and it can be recursively applied. Even though it's simple, I wouldn't bother coding it unless actual measurements indicate a need for it. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: The dreaded UITableView won't refresh problem.
G S wrote: Well, this has proven to be a stumper. In case the XIB was corrupted, I deleted the whole thing and started over. Same result. It's a deal-breaker, since this is the main interface of my app. Total standstill. I don't recall seeing any of your code that calls reloadData. Consider posting that. The first step for someone else to find the problem is for someone else to duplicate the problem. So do something that makes that possible. For example, make a complete compilable example that consistently demonstrates the problem, upload it to a public drop-box or pastebin website, and post the URL to the list. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSDictionary allValues not mutable
Trygve Inda wrote: Ultimately I have a masterDict containing a few thousand dicts (all having the same structure) which I need to convert to an array of dicts to be displayed in an NSTable. When I add to this array (quite rarely), I will actually add a new dict to the masterDict and then append this same object to the array (managed by an NSArrayController. One of the items in each dict is the key that is used to place it in the masterDict so when it is in the array I still know the key that refers to it in the masterDict. The reason for storing them as dicts in the masterDict instead of just an array is that I really need to be able to find them on a key-by-key basis The array is only for the ability to put them in an NSTable w/NSArrayController. This seems odd to me, but it's difficult to be sure without details on what the data is and how it's used. If the primary organization is of a numbered tabular sequence, as it seems to be, then the primary collection should be a numbered tabular sequence (NSMutableArray because it's mutable). Other forms, like B- trees, skip-lists, etc. would also be candidates, but those are still fundamentally sequences, with a design that improves searching, insertion, etc. Secondarily, it seems you want to be able to search the sequence quickly, for which you're using an NSDictionary. This doesn't represent the order of the items, it's only an aid to searching. If the dictionary is only used for speeding up searches, then the primary organization is still sequential, and the dictionary is just a speed-enhancer. Again, sorted trees or skip-lists would also speed up searches, while presenting a fundamentally sequential nature. So if the master dictionary and the array for the NSTable are encapsulated together in a class, you could use NSMutableArray as the primary structure, and encapsulate a hidden NSMutableDictionary used only for faster searching. Both are maintained in parallel by the enclosing class, so there's never any need to ask the dictionary for its array of values, nor to copy an immutable array to make a mutable version for table insertion. In short, make a class that encapsulates all the desired behavior by itself, rather than using a naked dictionary and the supplementary arrays it makes. It's possible that such an encapsulating class could subclass NSMutableArray, and maintain an internal dictionary only for fast searching. Then that class could be used directly by NSArrayController, while still performing fast searches. Or maybe the whole thing can be redesigned using NSMutableSet, which guarantees uniqueness and is intended for fast searching. It's unordered, so might be unsuitable for use in a table, though it does have the ability to produce a sorted array. See NSSet and NSMutableSet. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Making Java Calls from Objective-C !!
Naresh Kongara wrote: I want to know how to make java calls from Obj-C. (Java Bridge Seems to be deprecated). Is it possible with out bridge ? If yes , Can any body help me on Where to start ? Use JNI. Also see this Java-Dev message: http://lists.apple.com/archives/java-dev/2009/Oct/msg00497.html Google this: JavaNativeFoundation And you might get a better answer by asking on Java-Dev: http://lists.apple.com/mailman/listinfo/java-dev -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Making Java Calls from Objective-C !!
Nick Zitzmann wrote: So I found this, which has an answer that is not use the bridge but I haven't tried it myself: http://stackoverflow.com/questions/ 1822549/calling-java-library-from-objective-c-on-mac One of its answers is use TCP/IP. I have done that, and it works well. Same-process JVM via JNI's invocation API, or different process running /usr/bin/java via NSTask. For security, confine the network to loopback interface (lo0), which is quite easy to do in Java. I chose JSON as the data format: simple, compact, readily available libs for Cocoa and Java. I also used CocoaAsyncSocket on the Objective-C side, which simplified use of sockets and streams. YMMV. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Problem connecting to Oracle with app run from XCode
Timothy Mowlem wrote: I can run the XCode built app as well from the command line after setting LD_LIBRARY_PATH (as a non-admin user and without using sudo). If that env-var is the cause, then printf() the value of it in both cases, and manually compare them. Use the getenv() C function. You might also read the Mac OS X man page for 'dyld', if you haven't done so yet. Xcode Help Open man Page... -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Question about architecture
Daniel Lopes wrote: But what you think about separate custom views in diferent nibs? Is that right? Try it. See what happens. Repeat as needed. A lot of design questions can only be answered well by experience. Either you already have the experience from an earlier project, or you plan to get the experience by writing one to throw away. If you're a newcomer to a language, there is almost no chance that you'll do everything right the first time. You have to try things and see what works and what fails. You can read books all day, but you will eventually have to try some things that aren't in the book. When you do, you will find that every situation has its own unique set of constraints, even if they are slight variations on what's in the book. Only the simplest things are exactly the same as what's found in books. All software is exploration. If someone had already done exactly what you want, then you'd be using that existing software instead of creating a new thing yourself. http://en.wikipedia.org/wiki/The_Mythical_Man-Month -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTimer not working in a multithreaded application
Abhijeet Singh wrote: Hi,I am working on a multithreaded software that runs on a medical instrument. The software has 2 parts. GUI and worker threads (worker threads sends commands to instrument). The GUI is developed using ObjectiveC and Cocoa. Worker threads are all in C and Carbon.It is a Cocoa application.I am working on GUI of the software.When the application starts it first creates worker threads ( that initializes the hardware/instrument). Once the threads are created one of the thread sends a message back to main thread. My problem isi need to start a timer when the main thread receives a message from worker thread. I am starting a timer as follows:timer = [[NSTimer scheduledTimerWithTimeInterval:10.0 target:self selector:@selector(turnOffLight:) userInfo:nil repeats:NO] retain];But it does not work. I debugged it and found that the timer is created but turnOffLight is never executed.Then I created the timer just before worker threads creation and it worked. You may have been the victim of Cocoa's builtin multithreading locks, which are not initialized until multithreaded mode is entered. See the heading Using Posix Threads in a Cocoa Application, sub- heading Protecting the Cocoa Frameworks, in the Thread Management section of the Threading Programming Guide. --begin-quote-- For multithreaded applications, Cocoa frameworks use locks and other forms of internal synchronization to ensure they behave correctly. To prevent these locks from degrading performance in the single-threaded case, however, Cocoa does not create them until the application spawns its first new thread using the NSThread class. If you spawn threads using only POSIX thread routines, Cocoa does not receive the notifications it needs to know that your application is now multithreaded. When that happens, operations involving the Cocoa frameworks may destabilize or crash your application. To let Cocoa know that you intend to use multiple threads, all you have to do is spawn a single thread using the NSThread class and let that thread immediately exit. Your thread entry point need not do anything. Just the act of spawning a thread using NSThread is enough to ensure that the locks needed by the Cocoa frameworks are put in place. If you are not sure if Cocoa thinks your application is multithreaded or not, you can use the isMultiThreaded method of NSThread to check. --end-quote-- http://developer.apple.com/mac/library/documentation/cocoa/conceptual/ Multithreading/CreatingThreads/CreatingThreads.html Since you're mixing Cocoa and Carbon, you should read that entire section on Thread Management, and probably the entire Thread Management Guide. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSString / NSURL
Amy Heavey wrote: ... I've tried just using strings, but the applicationSupportFolder returns a string, which then is immutable so I can't add to it? There's a significant misconception lurking here. None of the NSString methods for appending or deleting actually modify the NSString they are applied to. A new NSString instance is created that contains a copy of the original's contents plus whatever contents is to be appended, or minus the contents to be deleted, or with some parts replaced, or whatever the operation is. The original NSString is never modified in any way. The methods whose name starts with string, as in stringByAppendingString, return an NSString object that the caller does not own. See the Memory Management Guide on ownership for the consequences (i.e. the uses of retain and release). Also see the NSString reference doc, and read the descriptions under stringByAppendingString and others. Example: Returns a new string made by appending a given string to the receiver The critical words are a new string and made by. The same is true of NSMutableString, when those same methods are applied. A new NSString is made that contains the altered copy of the contents, and that instance is returned. The only NSMutableString methods that modify the target object are the ones listed under Modifying a String in the NSMutableString reference doc. All the methods inherited from NSString are non- modifying. http://developer.apple.com/mac/library/documentation/Cocoa/Reference/ Foundation/Classes/NSMutableString_Class/Reference/Reference.html -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: How to assure NSTask termination when parent dies
Process group code:
// launch the task
[task launch];
pid_t group = setsid();
if (group == -1) {
NSLog(@setsid() == -1);
group = getpgrp();
}
if (setpgid([task processIdentifier], group) == -1) {
NSLog(@unable to put task into same group as self:
errno = %i, errno);
}
The current process-group id is inherited across fork() and execve()
- see their respective man pages. So if you reorder the operations
so setsid() occurs before [task launch], then the child inherits
automatically.
This doesn't mean the child can't change its own pgid/sid. And since
you mention a shell, it's not unusual for shells to do exactly that.
-- GG
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Re: NSCountedSet and NSString values question
Philip Mobley wrote: My question is basically how does NSCountedSet handle string values, are they interpreted by their string values or by their object values? If they are by object, then I need to do more work to pull the exact key object from the NSDictionary. NSCountedSet inherits from NSSet and NSMutableSet, both of which use the hash and isEqual: methods of contained objects. See the reference docs for each. In general, docs for a class do not repeat descriptions from a superclass, unless there is a difference. So to fully understand what any class does, you must often read the superclass's docs as well as the docs of the class you wish to use. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSCountedSet and NSString values question
Philip Mobley wrote: The author of the article is somewhat unsure whether using - isEqual: is safe, but after looking at the [NSString hash] documentation I feel confident in my current implementation. That author is confused, and should consult some reference documentation. It's really quite simple. In the words of the NSObject protocol reference doc, This method defines what it means for instances to be equal. Any concerns over the details of the implementation, or reliance upon those details, runs counter to the principles of object-oriented programming and encapsulation. Short answer... yes. NSSet and subclasses *effectively* compares the value of the NSString and not the object address. Cocoa Fundamentals Guide, Cocoa Objects section, Introspection sub-section, Object Comparison heading. http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/ CocoaFundamentals/CocoaObjects/CocoaObjects.html It might be useful to read the whole guide if it's new to you, or read it again if you've read it before. I often find that rereading fundamentals gives new insights. Also see the Discussion under NSString isEqualToString: “Literal” when applied to string comparison means that various Unicode decomposition rules are not applied and Unicode characters are individually compared. So, for instance, “Ö” represented as the composed character sequence “O” and umlaut would not compare equal to “Ö” represented as one Unicode character. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: [iPhone] Data protection clarification needed.
Sandro Noël wrote: There is no need for that data to be backed up anywhere, as it is retrievable from the web service. the cached data is used for offline operations and later synced back to the web service. We want to control when the data becomes available in an unencrypted format. and that would be when our application is the active application, otherwise in the background or terminated, the data is encrypted and inaccessible. Then you need encryption and key management. When your application becomes inactive, the protected data must become inaccessible. That means you must securely delete the decryption key. When your application becomes active, you must securely obtain a decryption key, which allows access to the protected data. There are different ways of doing those things. If you don't have good key management, it won't matter how well the data is encrypted, because an easily accessible key is the weakest point. You might get better or more specific advice on the CDSA list: http://lists.apple.com/mailman/listinfo/apple-cdsa CDSA = Common Data Security Architecture -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSInteger compare - Help Needed
Steve Wetzel wrote:
if ([sender tag] 10) {
The operator is LEFT-SHIFT.
The operator is LESS-THAN.
If you want to understand what your code is doing, think about what
happens when the numbers 0-9 are left-shifted by 10 bits.
-- GG
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Re: NSStream Questions
Jon Loeliger wrote: I'm writing a network server that needs to accept many simultaneous client connections and keep track of them. I've written the base server parts, roughly in the style of the Apple Examples (SimpleNetworkStreamsExample). These examples, however, only allow one connected client. I need to manage several full duplex NSStream in/out pairs. CocoaAsyncSocket is a nice building block. http://code.google.com/p/cocoaasyncsocket/ -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSStream Questions
John MacMullin wrote: Create a dictionary with the stream as the key, access and maintain the dictionary and stream stuff with the key, (NSValue key), lock or synchronize access to the dictionary. Applies to every pass through handleEvent (and everywhere else), ie., any broadcast code. Exercise caution. The default behavior for NSMutableDictionary's setObject:forKey: is to copy the key. If the stream is the key, this can lead to problems. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Reading in UTF-8 to Data
Brad Stone wrote: Yes, quoted-printable. That's precisely it but in doing my research in the documentation and on the internet it doesn't seem like it's a simple process especially for someone like me with 9 months of Cocoa development experience. There is nothing apparent in your code that would cause quoted- printable to magically appear. If it's not your code, the next most obvious candidate is your data. Exactly where is your data coming from, and exactly how did it get there? Maybe you have a glitch somewhere along your data-production pathway, that's unexpectedly producing quoted-printable. That pathway includes all uploads, file-transfers, file copies, etc. It even includes any editor you used the last time you looked at the original XML file. If the editor is helping you by interpreting quoted-printable, then you might want to try something simpler, like the 'cat' command in Terminal.app, or even the 'hexdump -C' command. If you're not a Terminal person, HexFiend is your friend (google it). -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Live updating user defaults from a prefpane to a running app
Shamyl Zakariya wrote: So first off, is there some built-in way to simply 'goose' the app and cause its defaults bindings to trigger? There are any number of ways. You could send a signal with the standard C function kill(). You could send a distributed notification (see NSDistributedNotificationCenter). You could send a UDP packet, or a multicast packet. The list goes on: pipes, file- system, shared memory, apple-events, etc. Each way of sending has a corresponding way of receiving: sigaction (), NSDistributedNotificationCenter handler, packet listener, etc. If not, what's the best practice here? And if I were to use some sort of apple event fired from the prefpane or some other technique to let the app know its defaults have changed, how do I get the user defaults controller in the headless app to apply the updates? If I understand the question correctly, then when the signal is received, your headless app calls -synchronize on the NSUserDefaults. This assumes you don't have any shared-access contention issues. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Pass-by value… warning
vincent habchi wrote: The analyzer does not figure out that the pt array gets initialized through the loop by copying values directly from a chunk of memory, and spits out the warning about pt [•] not being defined. Maybe I should report this to the LLVM team? That seems like a good idea. However, also consider that 'dim' may take on values 0 or 1. If dim is 0 or 1, then the local 'pt' array may not have valid elements at pt [0] or pt[1]. You may know that dim is never 0 or 1, but the analyzer has no way of knowing that. And I don't know what might happen if dim is negative. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Pass-by value… warning
vincent habchi wrote: That's true, the compiler cannot guarantee that dim 1, which is always the case actually. I am going to put an extra text at the beginning of the method, like: if (dim 1) return; and see what happens. If you need to guarantee dim 1, then your if statement should be: if (dim = 1) return -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: How to debug crash on startup of 64-bit build
Jeffrey J. Early wrote: - The crash does *not* occur when the application (either release or debug build) is launched within Xcode. - The crash *does* occur if I launch the app with gdb from the command line (same stack trace). Inspect and then change things about your executable's runtime environment when Xcode launches it. The most common culprits are working directory or environment variables. You can also try the opposite approach: run from the command-line with exactly the same runtime environment. The 'env' command can clear or set env-vars. Another trick to help find differences: intentionally trigger a SEGV signal when running from Xcode. Compare the full list of libs loaded against the full list of libs from the unintentionally crashing app. Check the full pathnames of every dylib loaded. Since the crash is apparently in dyld, maybe the cause is a DYLD_* env-var. There are also some helpful DYLD_* debugging env-vars you can try. See 'man dyld'. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Adding secure notes to a keychain programmatically
Brian Marick wrote: I've not been able to find a way to add a secure note to a keychain programmatically. SecItemClass in SecKeyChainItem.h gives no item class for secure notes, which makes me wonder if they're not actually in the keychain but stored somewhere on disk, encrypted with the keychain password (or something). Does anyone know? I can't find anything with a web search. Add a Secure Note to your keychain manually. It should have a distinctive name. Then use command line: security dump-keychain login.keychain and look for your distinctive name. Also see 'man security'. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Run application before Login starts?
kirankumar wrote: How to run a application before login starts (ie, before when we enter username and password). http://developer.apple.com/mac/library/technotes/tn2005/tn2083.html -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Capturing output from another task with elevated privilages
Eric Hoaglin wrote:
I have the following code:
http://www.pasteit4me.com/763005
I'm trying to capture the output of the task that I run. and from
what I understand, if you want to do so, you pass a FILE*
to AuthorizationExecuteWithPrivileges and then just read it as a
normal file (which you can see from lines 29-45
Your code has a serious bug.
if(taskFile != NULL) {
const int BYTES_TO_READ = 64;
char *theCString = malloc(sizeof(char) * BYTES_TO_READ);
int bufferSize = 64;
int bytesRead = 0;
int totalBytes = 0;
while((bytesRead = fread(theCString, 1, BYTES_TO_READ, taskFile)) !=
0) {
bufferSize += 64;
theCString = realloc(theCString, bufferSize);
totalBytes += bytesRead;
}
if (taskFile != NULL) {
NSLog(@Total Bytes Read: %i, totalBytes);
*tResults = [[NSString alloc] initWithBytesNoCopy:theCString
length:totalBytes encoding:NSUTF8StringEncoding freeWhenDone:YES];
}
Your fread() is always reading data into the start of the buffer
'theCString'. This is wrong. There should be a separate pointer
that's advanced by the number of bytes just read. Or use fread
(theCString+totalBytes,...).
You also have a stylistic flaw of repeated use of the magic number
64, despite defining a constant BYTES_TO_READ to represent it.
Another possible problem is you don't test the result returned from
AEWP(). You go straight into reading the FILE, and only test the
result later as part of a questionable retry block, not shown
above. There is a dubious busy loop in the retry, and there may be
other problems.
Is the fread() bug the cause of the problem you posted about? I
don't know. But it certainly is a significant problem, and it has a
huge effect on what data gets returned as the output of the task
string.
You never said what you were actually executing with elevated
privileges. If I were you, I'd test your code by running it on /bin/
echo or /usr/bin/id. Both of those executables are well
characterized and well behaved, and they emit text only on stdout.
If those fail in the same way, then make a well-isolated fully
compilable example and post its source.
The first step to solving the problem is to replicate it, but you
haven't provided enough code to do that.
-- GG
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Re: Capturing output from another task with elevated privilages
And you also need to identify what OS version you're running on. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Tracking multiple NSURLConnections
If I have lots of connections, say two dozen, or say I'm spawning connections continuously, would this be the most efficient way of doing this? I'd likely store them in an NSArray and iterate/compare until I find the right one. There could be lots of comparisons. Use NSSet instead of NSArray. It makes searching and some other things faster and simpler. http://developer.apple.com/mac/library/documentation/Cocoa/Reference/ Foundation/Classes/NSSet_Class/Reference/Reference.html OK, makes sense. But is what I've done so wrong or is it just that there are better ways? It's not really a question of wrong, but one of appropriateness to scale. If you only have one outstanding connection, then you don't need to distinguish multiple connections, by definition. If you do need to distinguish multiple connections, then you should use an approach that works at that scale. With a few, simple comparison is easy and clear. Beyond that, it becomes unwieldy. Beyond multiple dozens and into hundreds, you have other problems. BTW, using a different delegate for each connection can encapsulate connection identity. That is, your delegate object changes depending on what the data produced by the connection is intended for. Each connection delivers results to its delegate, which then performs the task appropriate for that connection's data. There is no if statement, no array to search, etc. at data-retrieval time. Each paired connection + delegate defines the entire processing path for the data. No repeated lookups or decision-trees are needed. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: using UTF-32 in NSString.
Georg Seifert wrote: Does anyone has information on how to use Unicode code points higher than 0x. NSString is UTF-16. Use surrogate pairs. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: autorelease: how does this work!? (if at all)
Jens Alfke wrote: I only saw one error: the method name “GetNSImage” should probably be “image” (method names should be lowercase unless they begin with a common acronym like “URL” or “TIFF”, and the prefix “get” is not used.) Also See These Methods Three: [[frame Camera] ExportFilePrefix], [frame FrameNumber]] Which May Be Fine In Sharpened C, Are Ne'er Condoned In Objective-C. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: FSCopyObjectAsync hogging the thread?
Kevin Boyce wrote: Sure, it seems like it's just another dispatch from the runloop. Which would be fine if it copied like 100K bytes per invocation, or something like that. It seems instead to run off and copy vast quantities of data before returning. Copying a 4MB MP3 file actually completes before the first time anything else in the runloop gets any service. I was hoping I had just missed how to adjust the time slices it takes. It may seem crazy, but there is no guarantee that any particular FS*Async function performs its operation asynchronously. The file- system operations could proceed entirely synchronously, and the only asynchronous part is that you get a callback at the end. There is certainly no way to specify time slices, or any other kind of slice or quantum, for the operation. If you want that granularity, you'll have to provide it yourself. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: 32bit float array to PNG thanks to NSBitmapImageRep problem
Pierre-Yves Aquilanti wrote: NSData * binaryData=[NSData dataWithContentsOfFile:binaryPath]; // binary is just a 32bits array full of 1500. and 3000. as described previously Does the endian-ness of the floats in the file match the endian-ness of the processor the code is running on? Also, in the NSCalibratedWhiteColorSpace, white is 1.0, black is 0.0, and grays all lie in the normalized range 0.0 thru 1.0. So 1500 and 3000 are whiter than white and will undoubtedly be truncated to white (1.0). It's unclear to me what the white value is in your 1500 and 3000 values, but if 3000 is white, then you need to divide your raw data by 3000 to get it into normalized range. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Off Screen bitmap drawing
Development wrote: What I get is a black rectangle of scrambled colors and no discernible resemblance to the page data. ... void * bitmapData = malloc(byteSize); ag IIRC, malloc() does not initialize the returned memory. Since you don't seem to do any other initialization, you are effectively drawing into a bit-map containing random data. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: posted notifications are sent twice
Reinhard Segeler wrote: I post notifications to interchange infos between classes. They are always posted twice, even though they are surely only posted once. Does anybody know why? Make sure you haven't registered two listeners, or a single listener twice. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Stealing settings from Mail.app
Chris Idou wrote: I've got an app that needs to send out emails. I'm trying to import mail settings from Mail.app. For some reason my keychain has passwords for smtp.gmail.com, but not for smtp.me.com. AFAIK, there is only the one MobileMe password for all uses. Double-click your MobileMe password in Keychain Access.app and look at its Access Control tab. Note that Mail.app is always granted access by default. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: subclass overwriting superclass ivar
Jonathan Mitchell wrote:
MGSScriptExecutorManager *scriptExecutorManager;
NSString *tempFilePath;
}
@interface MGS_B : MGS_A {
@private
NSData *stderrData;
}
Change the ivars to something like this:
MGSScriptExecutorManager *scriptExecutorManager;
NSString *tempFilePath;
NSString *watchMe; // should be nil at all times
}
@interface MGS_B : MGS_A {
@private
NSData *stderrData;
}
Then set a watchpoint on watchMe.
You can also sprinkle in assertions that watchMe is always nil.
-- GG
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Re: Getting TextEdit to Recognise UTF-8 Output
K.Darcy Otto wrote: Question: Is there any header I can put at the beginning of the text file to get it automatically recognised as UTF-8? It's not a header, but there is the com.apple.TextEncoding xattribute. See post #4 in the following thread: http://forums.macrumors.com/showthread.php?t=839674 -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: singleton design pattern
Abhinay Kartik Reddyreddy wrote: everytime you ask for a uniqueInstance it looks like it retrieves a new instance not the existing instance... since you set the uniqueinstance to nil inside that function, your function will discard the previous instance if any and then create a new instance. Singleton is supposed to return existing instance if any and if none create one. Also i guess the scope of your static is local. correct me if i am wrong. Your assertion that a new instance is created every time is wrong. It would be right if the storage class were anything but static. But it is static. So a new instance is created only once, barring any thread-unsafe artifacts. By the way, this is true for plain ordinary standard C. Objective-C does not change it. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTask and piped commands
appledev wrote:
arguments = [NSArray arrayWithObjects: @-c, @/bin/df -k| /
usr/bin/grep /dev/ | /usr/bin/awk '{print $1 $4 $5 $6;}',nil];
Your awk syntax is somewhere between quirky and wrong. Since you
didn't mention what the problem was, I will assume the output you
want is not the output you're getting.
I will also assume that you ARE getting some output, despite Alastair
Houghton previously noted comment that waiting for termination before
reading stdout can be unsafe. Unless you have a whole lot of mounted
disks, the pipe buffer won't fill up and cause deadlock (it's about
16 KB, empirically determined, in all Mac OS X versions I've tested,
since 10.0).
Here are the awk problems...
String concatenation in awk is indicated by whitespace. So this:
print $1 $4 $5 $6
concatenates the strings together, then prints them as a single
value, followed by the output record separator (newline by default).
If you want the default output field separator, you need this awk line:
print $1, $4, $5, $6
The default output field separator is defined by the awk variable
named OFS. To use tab as OFS:
{ OFS=\t; print $1, $4, $5, $6;}
You can discover all this simply by reading awk's man page.
The resulting bash command-line is:
/bin/df -k| /usr/bin/grep /dev/ | \
/usr/bin/awk '{ OFS=\t; print $1, $4, $5, $6;}'
I have inserted a \ to force a continuation line, so mail doesn't
line-fold badly.
To encode that properly as an Objective-C string literal, you need to
escape both the double-quotes and the backslash:
arguments = [NSArray arrayWithObjects:
@-c,
@/bin/df -k| /usr/bin/grep /dev/ | /usr/bin/awk '{ OFS=\\\t\;
print $1, $4, $5, $6;}',
nil];
(The Objective-C was written in mail and not compiled. The command-
line with the modified awk code was tested in bash.)
And I should note that awk is perfectly capable of matching the /
dev/ pattern by itself with no assistance from grep. This is left
as an exercise for the interested reader.
-- GG
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Re: AsyncUdpSocket: Receiving duplicate UDP Packet
Todd Burch wrote: [aSyncSocket receiveWithTimeout:-1 tag:1]; //Listen for the next UDP packet to arrive...which will call this method again in turn. Don't start another receive. Handle or ignore the packet, then always return NO from the delegate method. The single outstanding receive will continue receiving packets and passing them to the delegate. Don't return YES until you want it to stop receiving callbacks. It seems wacky but it worked for me. And I used a large timeout (1.0e9), not a negative one. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Client/Server Design
Phillip Mills wrote: I've read the notorious Technical Note TN2152, iPhone OS does not currently provide a direct way for third party developers to transfer data between the user's computer and their device, but I assume common workarounds are in place. Obviously I could follow the note's suggestions about rolling my own from lower level functions (or GameKit?), however I thought I should ask whether there are strategies and libraries that other people have found useful for solving similar problems. Cocoa AsyncSocket http://code.google.com/p/cocoaasyncsocket/ BLIP Protocol http://groups.google.com/group/blip-protocol -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSCalendar date calculation anomaly
Scott Ribe wrote: NSDate * cd = [[NSCalendar currentCalendar] dateByAddingComponents: dc toDate: [NSDate dateWithString: @2001-01-01] options: 0]; I think the dateWithString: is wrong. From the NSDate reference: You must specify all fields of the format string, including the time zone offset, which must have a plus or minus sign prefix. Refactored code fragments: NSDate * refDate1 = [NSDate dateWithString: @2001-01-01]; NSDate * refDate2 = [NSDate dateWithString: @2001-01-01 00:00:00 +]; NSLog( @refDate1: %@, refDate1 ); NSLog( @refDate2: %@, refDate2 ); ... NSDate * cd = [[NSCalendar currentCalendar] dateByAddingComponents: dc toDate: refDate1 options: 0]; // should be same as original ... NSDate * cd = [[NSCalendar currentCalendar] dateByAddingComponents: dc toDate: refDate2 options: 0]; -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSCalendar date calculation anomaly
A couple suggestions: If you always calculate using noon on any given date, rather than midnight, then DST transitions won't affect the year/month/day components. If you don't want to use noon, then NSTimeZone daylightSavingTimeOffsetForDate: should be taken into account. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: menu madness with retain count
Bill Appleton wrote: 3) when i set the menus i have created for NSApp using setMainMenu then... what? who owns them? how do i set more menus for NSApp? how do i get NSApp to release the current set? You are not responsible for NSApplication's retention or release of menus. It alone is responsible for that. You set more menus for NSApplication by calling its setMainMenu: method with a different set of menus. That's all you need to know, and all you need to do. What happens in NSApplication as a result of calling setMainMenu: is not your responsibility. To get the current main menu, call NSApplication's mainMenu method. You could use this to get the current main menu, which you will not own unless you retain. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: CharacterSet: CharSet(A) - CharSetUnicode = remainder ?
Filip van der Meeren wrote: What I was trying to do is the following: C/C++ operator| NSCharacterSet operation - | (or) | [aCharSet formUnionWithCharacterSet:bCharSet]; (and) | [aCharSet formIntersectionWithCharacterSet:bCharSet]; ^ (xor)| ? There are several equivalents for XOR built from AND, OR, NOT. http://en.wikipedia.org/wiki/Exclusive_or If you want one that takes least memory or least time, create tests and measure, rather than assume. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSNumberFormatter not working for me ?
Bill Hernandez wrote: I've worked with lots of number formatters over the years, and that is what they do, format numbers into strings, any kind of string... I looked at the header file for NSNumberFormatter, and there seem to be 9,000,000+ methods, it is amazing. Buried in there, there has to be a simple way to format a string, that I am overlooking ? If you look the simple formatter I wrote up last night, it will format a string digits any way imaginable. Your code formats strings (more specifically, characters in strings). It does not format numbers, as such. By number I mean a binary numeric value (floating-point or integer), or possibly NSNumber or NSDecimalNumber. All your number parameters are actually of the NSString* type, not of a numeric type. The fact that the string contains digits is incidental. In a sense, converting a numeric value to NSString* is already a formatting operation, or at least a conversion operation. Your code would work just as well if you passed it an alphabetic string, or one containing punctuation marks. strippedNumber = @SueMeTomorrow format = @Social Security : ###-##-### result = @Social Security : Sue-Me-Tom I'm not saying the digit-string isn't relevant to what you're doing, only that what you seem to think of as a number is, in fact, a string that happens to contain a series of digit characters. I think that was a point an earlier reply was trying to make: NSNumberFormatter is for numeric values (NSNumber, in particular), not string values that happen to contain digits. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSPipe (NSFileHandle) writedata limit?
McLaughlin, Michael P wrote: Is there a recommended (better) way of sending and receiving a known (large) amount of data to and from a subtask? Is there any sample code anywhere similar to what I need? I couldn't find anything close enough to work. Reading your description, my first thought was sockets. And more specifically, CocoaAsyncSocket: http://code.google.com/p/cocoaasyncsocket/ However, you still haven't completely described how your subtasks consume input and produce output, and how the parent collects output or other results. So sockets may not work any better. I am assuming that subtask output or results are written to the subtask's stdout stream, which is a pipe back to the parent process. If all the subtasks read *all* the input data before producing any output data, then I don't know why the parent would be blocking in pipe-writing. The only reasons that come to mind are bugs: misinterpretation of protocol bytes, reading the wrong sizes, etc. If the subtasks read *some* input, then produce *any* output on stdout, then that is an opportunity for deadlock, as I previously described. Here's how deadlock happens: after reading some but not all input, the subtask writes to its stdout. This is a pipe back to its parent. The parent is NOT reading its end of the pipe. When the pipe fills up (16 KB), the subtask is then blocked in its writing to stdout. Since it's blocked, it no longer reads its stdin (another pipe to parent). So if parent continues to write bytes to its end of the pipe, and does not read from the subtask's output pipe, then the parent will eventually block when writing to the pipe that is the subtask's stdin. The parent is now waiting for the child to read its input, freeing up space in the pipe, and the child is waiting for the parent to read its input, and neither one can proceed until the other does. Classic deadlock. The fundamental design is send all data before looking for any results. This is inherently synchronous, even though two or more processes are involved. If the subtask is designed to read all data before producting any results, then it shouldn't deadlock. However, if the subtask is designed to read some data, produce some results, then it is prone to deadlock. Note that sockets WILL NOT prevent deadlock in this situation. If the requester (the parent) sends enough data to the responder (the subtask), but does not read pending responses, then TCP/IP will eventually block, just as surely as pipes do. The size may be larger than with pipes, but it can still happen. Neither pipes nor sockets are infinitely buffered streams. If you treat them as such in your software design, then that is a grave error. I can't tell if this is the cause of the blocking or not, because you haven't described how the subtasks produce output. You also haven't described how the parent reads the output from the subtasks. If the reading is fully asynchronous and infinitely buffered, then it shouldn't deadlock. However, if it's synchronous or has a finite buffer length, then it will deadlock under some conditions. The exact conditions depend on the length of the buffers and the amounts of data produced for a given input. Each pipe will hold 16 KB before it blocks on write. Two pipes, so that account for 32 KB. The other 32 KB could be in-memory buffering in any of the processes. If nothing else works, then I think you need to make a well-isolated test case that exhibits the problem. The subtask can be something simple, like the 'wc' (word-count) command-line tool. It reads all input before producing any output, so it should never exhibit deadlock even if your parent doesn't read any responses until all data is sent. -- GG ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSPipe (NSFileHandle) writedata limit?
McLaughlin, Michael P. wrote:
main -- subtask (main send data)
-(void)sendData:(void*)data numBytes:(NSUInteger)sz taskTag:
(NSString*)tag
{
NSData *dataset = [NSData dataWithBytes:data length:sz];
NSNumber *num = [NSNumber numberWithUnsignedInteger:sz]; //
NSUInteger
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:
num,
@size, nil];
[sendEnd writeData:dataset];// Do NOT close the fileHandle!
[[NSDistributedNotificationCenter defaultCenter]
postNotificationName:tag
object:myID userInfo:dict];
}
That is, main
1) sends (via FileHandle and pipe) a known quantity of data to the
subtask
and
2) tells it what sort of data are coming and how much.
All that stuff I just wrote? Uh, never mind.
There's your deadlock right there.
You must send the notification with size and such BEFORE writing to
the pipe. Otherwise the sender can become blocked, because the
receiver doesn't know it should be reading anything.
If you'd been sending the size over the pipe, it would have been
obvious. You have to tell the receiver how many bytes follow.
-- GG
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