date:20090416

On Thu, Apr 16, 2009 at 5:01 AM, Oleg Krupnov oleg.krup...@gmail.com wrote:
 I'm looking for the right way of setting up the auxiliary NSTask from
 within the main task. The aux task vends some Distributed Objects, and
 the main task uses them.

 The auxiliary task does this:

 NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

 MyVendedObject* vendedObj = [[[MyVendedObject alloc] init] autorelease];

 NSConnection* connection = [NSConnection defaultConnection];
 [connection setRootObject:vendedObj];
 if ([connection registerName:@MyAuxTask])
 {
        [[NSRunLoop currentRunLoop] run];
 }

 [pool release];
 return 0;

 As I understand, as soon as the aux tasks reaches the runloop's run
 message, it blocks and is ready for connection messages.

 However there are 2 problems:

 1) I need to block the main task until the aux task is ready to work.
 How do I do it? Sleep/poll connection/repeat doesn't seem a good
 approach, is there any better way?

 2) How do I quit the aux task? [NSTask terminate] does not work,
 invalidating the connection does not work...
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Fwd: Setting up an auxiliary task for use with Distributed Objects

Apologies for the multiple-send. Keep forgetting to reply to all.
Looking to see if I can set that as default or just have to start
slapping myself for negative reinforcement instead.

-- Forwarded message --
From: Jeremy W. Sherman jeremyw.sher...@gmail.com
Date: Thu, Apr 16, 2009 at 9:26 AM
Subject: Re: Setting up an auxiliary task for use with Distributed Objects
To: Oleg Krupnov oleg.krup...@gmail.com

You can communicate with the task, since you seem to control it, by
setting up a pipe (NSPipe) and setting its write/read file handles as
the stdin/stdout for the task. The task can then send you a ready to
go signal. You can use -[NSFileHandle
waitForDataInBackgroundAndNotify] to get a callback when the ready
signal is sent back. On the other side, you can have it check for a
broken connection (is that possible with NSConnection/NSMachPort?) or
just wait for a kill message to come across on its stdin, which your
primary task can send over.

I've not had much luck with DO, so there might be a better way out there.

—Jeremy

On Thu, Apr 16, 2009 at 5:01 AM, Oleg Krupnov oleg.krup...@gmail.com wrote:
 I'm looking for the right way of setting up the auxiliary NSTask from
 within the main task. The aux task vends some Distributed Objects, and
 the main task uses them.

 The auxiliary task does this:

 NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

 MyVendedObject* vendedObj = [[[MyVendedObject alloc] init] autorelease];

 NSConnection* connection = [NSConnection defaultConnection];
 [connection setRootObject:vendedObj];
 if ([connection registerName:@MyAuxTask])
 {
        [[NSRunLoop currentRunLoop] run];
 }

 [pool release];
 return 0;

 As I understand, as soon as the aux tasks reaches the runloop's run
 message, it blocks and is ready for connection messages.

 However there are 2 problems:

 1) I need to block the main task until the aux task is ready to work.
 How do I do it? Sleep/poll connection/repeat doesn't seem a good
 approach, is there any better way?

 2) How do I quit the aux task? [NSTask terminate] does not work,
 invalidating the connection does not work...
 ___

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Re: nstoolbar in tiger

2009-04-16 Thread I. Savant

On Thu, Apr 16, 2009 at 9:21 AM, Kiel Gillard kiel.gill...@gmail.com wrote:

 You don't need to create a subclass of NSwindow, all you need is an object
 to provide the NSWindow instance a NSToolbar.

  The difference that likely led Jo to this conclusion is that
Interface Builder 3 (and the latest version of nibs/xibs that go with
it) has the ability to create and store toolbars directly in the NIB,
whereas previous versions did not. Before this, you had to do it all
in code and there are a lot of examples to do so, one of which Kiel
points out.

  In fact, on half the occasions I've had to create a toolbar with the
latest and greatest tools, I was forced revert to code for better
control. IB 3 is great for creating basic toolbars, but anything
beyond basics will likely require code.


 B.I.B.L.E. - Basic Instructions Before Leaving Earth

  Yes, everybody should stone at least one adulterer to death before
they go ... ;-)

--
I.S.
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Re: Combing Bindings with Target-Action

2009-04-16 Thread Jeff Hutchison

Thanks for the responses. I had used KVO on the bound property on an
earlier version and was encountering a small problem due to the nature
of my application. There might be cleaner way so some more details
might be helpful.

I'm writing an application that connects to my home theater receiver
on its telnet port to remote control and monitor it. The model
represents the state of the receiver and can be updated in three ways:

1. Through bindings to the application UI controls.
2. From events sent by the receiver as a response to commands sent by my app.
3. From events sent by the receiver due to other interactions with the
receiver (IR remote, front panel, embedded web server).

Two and three appear identical to my app but I can figure out case 2
by using the event handler's change dictionary's
NSKeyValueChangeOldKey and NSKeyValueChangeNewKey values.

I need to know if the model was updated by the UI or by networking
code so that I only send command to the receiver in response to UI
changes, not other interactions with the receiver. For example, the
problem is the observer would see the model mute value change to
on when I changed it at the receiver and interprets that as a change
on the app UI.  It would then send a redundant mute on command to
the receiver.

Using target-action with bindings solved the problem nicely with a
minimum of extra code. If I fail to verify that a race condition
doesn't exist I can fall back to reading the values from the action's
sender parameter instead of the bound model.

Jeff

On Wed, Apr 15, 2009 at 11:26 PM, Kyle Sluder kyle.slu...@gmail.com wrote:
 On Wed, Apr 15, 2009 at 3:04 PM, Jeff Hutchison
 hutchison.j...@gmail.com wrote:
 I am relying on the binding messages to complete before the
 target-action message - is this an OK idea?

 Why not just register as an observer of the bound property?

 --Kyle Sluder

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Re: nstoolbar in tiger

2009-04-16 Thread Jo Phils

Hello and thanks for the replies!

Yes it's what I.S. mentioned about doing with IB3.  That clears it up and I'll 
just do it the old-fashioned way following the examples... :-)

Thanks again,

Rick






From: I. Savant idiotsavant2...@gmail.com
To: Kiel Gillard kiel.gill...@gmail.com
Cc: Jo Phils jo_p...@yahoo.com; cocoa dev cocoa-dev@lists.apple.com
Sent: Thursday, April 16, 2009 9:49:25 PM
Subject: Re: nstoolbar in tiger

On Thu, Apr 16, 2009 at 9:21 AM, Kiel Gillard kiel.gill...@gmail.com wrote:

 You don't need to create a subclass of NSwindow, all you need is an object
 to provide the NSWindow instance a NSToolbar.

  The difference that likely led Jo to this conclusion is that
Interface Builder 3 (and the latest version of nibs/xibs that go with
it) has the ability to create and store toolbars directly in the NIB,
whereas previous versions did not. Before this, you had to do it all
in code and there are a lot of examples to do so, one of which Kiel
points out.

  In fact, on half the occasions I've had to create a toolbar with the
latest and greatest tools, I was forced revert to code for better
control. IB 3 is great for creating basic toolbars, but anything
beyond basics will likely require code.


 B.I.B.L.E. - Basic Instructions Before Leaving Earth

  Yes, everybody should stone at least one adulterer to death before
they go ... ;-)

--
I.S.



  
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Importing Word doc in Carbon app via Cocoa

2009-04-16 Thread Steve Mills

I'm not a Cocoa developer, so I rarely have to touch the stuff. This  
code used to work, and I'm not sure when or why it got broken. It  
previously did not have the NSApplicationLoad or NSAutoreleasePool, so  
I added those in hopes that that was the problem. Before adding those  
2 things, I would get a crash down in some Cocoa stuff (see stack  
after routine). After adding those 2 things, it crashes at [localPool  
release]. I was told to use those 2 things in a few other Cocoa  
routines we have in our Carbon app, and they still work (using  
NSCursor and NSAnimationEffectPoof).


Any ideas on what might be wrong? I appreciate any help.

void ConvertWordDataIntoRTFData(const Byte* const data, const UInt32  
len, fAutoBufferchar outData)

{
outData.clear();

if(data != nil  len  0) {
if(NSApplicationLoad()) {
NSAttributedString* attrStr;
NSData* nsdata;
NSDictionary*   attr = nil;
NSAutoreleasePool*  localPool;

localPool = [[NSAutoreleasePool alloc] init];

// Convert the Word doc data into an attributed string:
nsdata = [NSData dataWithBytes:data length:len];

if(nsdata != nil) {
attrStr = [[NSAttributedString alloc] initWithDocFormat:nsdata  
documentAttributes:attr];

[nsdata release];

if(attrStr != nil) {
// Create rtf data from the attributed 
string:
NSRange range = 
NSMakeRange(0, [[attrStr string] length]);

nsdata = [attrStr RTFFromRange:range 
documentAttributes:attr];
[attrStr release];

if(nsdata != nil) {
outData.append([nsdata length], 
(char*)[nsdata bytes]);
[nsdata release];
}
}
}

[localPool release];
}
}
}

Crash stack before adding NSApplicationLoad dnd NSAutoreleasePool:

#0  0x94022688 in objc_msgSend
#1  0x926bf08f in NSPopAutoreleasePool
#2  0x9600779f in _wrapRunLoopWithAutoreleasePoolHandler
#3  0x90b319a2 in __CFRunLoopDoObservers
#4  0x90b32c40 in CFRunLoopRunSpecific
#5  0x90b33cd8 in CFRunLoopRunInMode
#6  0x912712c0 in RunCurrentEventLoopInMode
#7  0x912710d9 in ReceiveNextEventCommon
#8  0x912cfc6e in _AcquireNextEvent
#9  0x912ce3cb in RunApplicationEventLoop
#10 0x00204edf in fApp::Run at fApp.cp:2432
#11 0x001eed79 in main at DogbertMain.cp:146

_
Steve Mills  Me: 952-401-6255
Senior Software Architect MultiAd
smi...@multiad.com   www.multi-ad.com


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Re: Importing Word doc in Carbon app via Cocoa

2009-04-16 Thread Michael Ash

On Thu, Apr 16, 2009 at 11:32 AM, Steve Mills smi...@multi-ad.com wrote:
I'm not a Cocoa developer, so I rarely have to touch the stuff. This code
used to work, and I'm not sure when or why it got broken. It previously did
not have the NSApplicationLoad or NSAutoreleasePool, so I added those in
hopes that that was the problem. Before adding those 2 things, I would get a
crash down in some Cocoa stuff (see stack after routine). After adding those
2 things, it crashes at [localPool release]. I was told to use those 2
things in a few other Cocoa routines we have in our Carbon app, and they
still work (using NSCursor and NSAnimationEffectPoof).

Any ideas on what might be wrong? I appreciate any help.

Your code is full of memory management errors. It is fairly amazing
that it ever worked. The lack of an autorelease pool probably covered
up the errors in exchange for leaking.

Anyway, read through this, and then fix up your code accordingly:

http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmRules.html#//apple_ref/doc/uid/2994-BAJHFBGH

The particular error you're making is releasing objects that you don't own.

Mike
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Re: -viewDidMoveToWindow without subclassing? NSViewController?



On 2009 Apr 15, at 22:14, Michael Ash wrote:


IMO that's a silly objection. Subclassing and adding this method is
easy, straightforward, and it works. You only need to override one
method to justify having a subclass.


Thanks Michael.  I decided to subclass the view that needs the  
initialization (NSPredicateEditor) instead of the tab view item's  
content view.  So now it has some other code, relocated from the  
window controller.  But it's the same idea.


I'm still having trouble with NSPredicateEditor's - 
viewDidMoveToWindow, though.  But before I pursue that I'd like to  
continue discussion of Graham's comment, to make sure I'm on the  
beaten path...


On 2009 Apr 15, at 20:09, Graham Cox wrote:

Views that are not in the currently selected tab are not in the view  
hierarchy ... [notShownView window] is always nil. It doesn't matter  
when you call it - if it's not visible in the selected tab you can't  
find the window that way.


Conversly, when a tab is visible, any visible view in it will return  
the valid -window.  Since I only need it once, during initialization,  
I grab it during -viewDidMoveToWindow.


If you need the window, the window controller will return it from - 
window.


The other way around, Graham.  I need the window controller, so I get  
it from -window.  See below.



I don't see why you need to get this from an item in a tab view?
You talk about the need to initialise something. What? How? What are  
you trying to do?


In general, I need the document during initialization, so I do

   [[[aView window] windowController] document]

Here are two examples of why I need the document:

*  In an NSPredicateEditor subclass, during -viewDidMoveToWindow,  
creating the row templates requires a reference to the document's  
managed object context, so it can get attribute types.  See code [1].


*  In an NSOutlineView subclass, during -viewDidMoveToWindow, I need  
to initialize and set a data source, which needs a (weak) reference to  
the document in order to get data objects.  See code [2].


Is this an abnormal design pattern?  I think I've seen people set  
their document as nib File's Owner, but I can't do that since my  
document is sometimes instantiated without a window.  My nib File's  
Owner is a window controller.


Jerry


[1]  In implementing a subclass of NSPredicateEditor...

- (void)viewDidMoveToWindow {
// To make sure this only runs once...
if ([self isInitialized]) {
return ;
}
[self setIsInitialized:YES] ;

NSManagedObjectContext* moc = self window] windowController]  
document] managedObjectContext] ;
NSEntityDescription* entityDescription = [NSEntityDescription  
entityForName:@Stark_entity
  
inManagedObjectContext:moc] ;


NSArray* rowTemplates = [self  
templatesWithAttributeKeyPaths:keyPaths
  
inEntityDescription:entityDescription] ;


[self addRowTemplates:rowTemplates] ;

...
}


[2]  In implementing a subclass of NSOutlineView...

- (void)viewDidMoveToWindow {
// To make sure this only runs once...
if ([self dataSource]) {
return ;
}

// Create and set data source
Bookshelf* document_ = [[[self window] windowController]  
document] ;
ContentDataSource* dataSource = [[ContentDataSource alloc]  
initWithDocument:document_] ;

[self setDataSource: dataSource] ;
[dataSource release] ;

// Set the doubleclick action.
[self setTarget:[[[self window] windowController] document]] ;
[self setDoubleAction:@selector(visitItems:)] ;

...
}


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Re: Importing Word doc in Carbon app via Cocoa

2009-04-16 Thread Jesper Storm Bache


You'll want to read Cocoa memory management:
http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmObjectOwnership.html#/ 
/apple_ref/doc/uid/2043


The general rule is that if you do *not* create an instance by using  
[[X alloc] initZZ] then you should *not* call release (because your  
instance has been auto released).



I'm not a Cocoa developer, so I rarely have to touch the stuff. This
code used to work, and I'm not sure when or why it got broken. It
previously did not have the NSApplicationLoad or NSAutoreleasePool, so
I added those in hopes that that was the problem. Before adding those
2 things, I would get a crash down in some Cocoa stuff (see stack
after routine). After adding those 2 things, it crashes at [localPool
release]. I was told to use those 2 things in a few other Cocoa
routines we have in our Carbon app, and they still work (using
NSCursor and NSAnimationEffectPoof).

Any ideas on what might be wrong? I appreciate any help.

void ConvertWordDataIntoRTFData(const Byte* const data, const UInt32
len, fAutoBufferchar outData)
{
outData.clear();

if(data != nil  len  0) {
if(NSApplicationLoad()) {
NSAttributedString* attrStr;
NSData* nsdata;
NSDictionary*   attr = nil;
NSAutoreleasePool*  localPool;

localPool = [[NSAutoreleasePool alloc] init];

// Convert the Word doc data into an attributed string:




nsdata = [NSData dataWithBytes:data length:len];

if(nsdata != nil) {
attrStr = [[NSAttributedString alloc] 
initWithDocFormat:nsdata
documentAttributes:attr];


Don't release here:

//  [nsdata release];

if(attrStr != nil) {
// Create rtf data from the attributed 
string:
NSRange range = 
NSMakeRange(0, [[attrStr string] length]);

nsdata = [attrStr RTFFromRange:range 
documentAttributes:attr];
[attrStr release];

if(nsdata != nil) {
outData.append([nsdata length], 
(char*)[nsdata bytes]);


Don't release here:



//  [nsdata release];
}
}
}

[localPool release];
}
}
}

Crash stack before adding NSApplicationLoad dnd NSAutoreleasePool:

#0  0x94022688 in objc_msgSend
#1  0x926bf08f in NSPopAutoreleasePool
#2  0x9600779f in _wrapRunLoopWithAutoreleasePoolHandler
#3  0x90b319a2 in __CFRunLoopDoObservers
#4  0x90b32c40 in CFRunLoopRunSpecific
#5  0x90b33cd8 in CFRunLoopRunInMode
#6  0x912712c0 in RunCurrentEventLoopInMode
#7  0x912710d9 in ReceiveNextEventCommon
#8  0x912cfc6e in _AcquireNextEvent
#9  0x912ce3cb in RunApplicationEventLoop
#10 0x00204edf in fApp::Run at fApp.cp:2432
#11 0x001eed79 in main at DogbertMain.cp:146


Jesper Storm Bache
Core Technologies
Adobe Systems Inc

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Re: Importing Word doc in Carbon app via Cocoa

2009-04-16 Thread Shawn Erickson

On Thu, Apr 16, 2009 at 8:32 AM, Steve Mills smi...@multi-ad.com wrote:

 Any ideas on what might be wrong? I appreciate any help.

Simple misapplication of Cocoa memory management. Read the following
(seriously it will save you a lot of time)...

http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/MemoryMgmt.html

                        // Convert the Word doc data into an attributed string:
                        nsdata = [NSData dataWithBytes:data length:len];

The object pointed to by nsdata was made available to you by a method
that doesn't also give you an ownership role for that object.

                        if(nsdata != nil) {
                                attrStr = [[NSAttributedString alloc]
 initWithDocFormat:nsdata documentAttributes:attr];
                                [nsdata release];

You then proceed to release the object pointed to by nsdata but you
never retained it before this point in time (aka didn't take an
ownership role so no need to give up ownership).

                                if(attrStr != nil) {
                                        // Create rtf data from the
 attributed string:
                                        NSRange                 range =
 NSMakeRange(0, [[attrStr string] length]);

                                        nsdata = [attrStr RTFFromRange:range
 documentAttributes:attr];

Again the object pointed to by nsdata was made available to you by a
method that doesn't also give you an ownership role for that object.

                                        [attrStr release];

                                        if(nsdata != nil) {
                                                outData.append([nsdata
 length], (char*)[nsdata bytes]);
                                                [nsdata release];

Again you then proceed to release the object pointed to by nsdata but
you never retained it before this point in time (aka didn't take an
ownership role so no need to give up ownership).

                                        }
                                }
                        }

                        [localPool release];

Then things crash under the above call (or at the end of the next
event loop) because you over released objects out from under the auto
release pool who was asked to release those same objects by the
methods that originally gave your code access to the NSData instances.

-Shawn
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Re: Importing Word doc in Carbon app via Cocoa

2009-04-16 Thread Steve Mills


On Apr 16, 2009, at 10:44:07, Jesper Storm Bache wrote:


You'll want to read Cocoa memory management:
http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmObjectOwnership.html#/ 
/apple_ref/doc/uid/2043


The general rule is that if you do *not* create an instance by using  
[[X alloc] initZZ] then you should *not* call release (because your  
instance has been auto released).



Thanks for the help, everyone. I hope I remember the rules the next  
time I have to deal with Cocoa.


_
Steve Mills  Me: 952-401-6255
Senior Software Architect MultiAd
smi...@multiad.com   www.multi-ad.com


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Re: Apple's PredicateEditorSample returns [self init] in -awakeFromNib ?!?



On 2009 Apr 15, at 22:07, Michael Ash wrote:


It's completely busted ... File a bug ...


I agree.  Without objection, then ...  Bug ID 6798076.

Just for the record, there is something else very weird in  
PredicateEditorSample.  When you run it,  if you choose predicate  
operator contains,  it shows in the log as IN,  but it acts like  
CONTAINS.  Very strange.  Then,  if you go into Interface Builder  
and un-check and then re-check contains and re-run the demo,  you  
get an error.  But then it worked in ^my^ app which is doing a Core  
Data fetch instead of a Spotlight search.


I know that's not a real good description but I need to move on here.


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Re: Reading in dictionary from txt file: options for speed

Marcel, NOW we're talking. This has really been such an eye-opening thread.

Now it's googling time to try to figure out how to search for a string in
there.

Thanks!





On Wed, Apr 15, 2009 at 7:01 PM, WT jrca...@gmail.com wrote:

 Hi Marcel,

 that's quite impressive. On the simulator on my machine, it took 0.007
 seconds, consistently. Learned something new with your message. Thanks!

 Wagner

 On Apr 16, 2009, at 12:35 AM, Marcel Weiher wrote:

  I would do the following:

 1. map the file into memory using -[NSData dataWithContentsOfMappedFile:]
  (or mmap() if you really want to)
 2. Do not convert to individual objects for the words
 3. get the pointer to the raw bytes
 4. search using a little bit of plain old C (assuming you're OK with
 encodings)


 Memory mapping will be essentially instantaneous, with the I/O performed
 on-demand when its actually needed (or you can pre-heat the data, for
 example in a background thread).  More importantly, you will be doing good
 things for memory consumption, because the mapped memory can be released to
 the OS without having to kill your app in low-memory situations (without
 paging it out on Mac OS X, but the iPhone doesn't page memory out).

 I added an implementation of this approach to the testing program provided
 by Wagner (thanks!) and it loads + counts the words in 0.084 seconds on the
 device.  That's anywhere from around 50 - 100 times faster than the other
 methods implemented in DictTest (plist / xml / txt ).  On the simulator, it
 runs in 0.043 seconds, so around 30-40 times faster than the other methods.

 Download can be found here:

http://www.metaobject.com/downloads/Objective-C/DictTest.tgz

 You mentioned that you were OK with search performance, so I won't go into
 that.

 Cheers,

 Marcel

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Re: Reading in dictionary from txt file: options for speed


Hi Wagner,

we have rather impressive hardware these days, and Objective-C can  
access all that power if you let it.  The 0.007 time for the simulator  
you got sounds about right, my 0.043 was a typo, I was missing a  
leading zero (fast MacPro).  Incidentally, the  - [start  
timeIntervalSinceNow]  you used in your code is a really clever trick  
for getting elapsed time, it took me a while to figure out that it was  
not a bug :-)


Cheers,

Marcel


On Apr 15, 2009, at 19:01 , WT wrote:

that's quite impressive. On the simulator on my machine, it took  
0.007 seconds, consistently. Learned something new with your message.


On Apr 16, 2009, at 12:35 AM, Marcel Weiher wrote:


I would do the following:

1. map the file into memory using -[NSData  
dataWithContentsOfMappedFile:]  (or mmap() if you really want to)

2. Do not convert to individual objects for the words
3. get the pointer to the raw bytes
4. search using a little bit of plain old C (assuming you're OK  
with encodings)



Memory mapping will be essentially instantaneous, with the I/O  
performed on-demand when its actually needed (or you can pre-heat  
the data, for example in a background thread).  More importantly,  
you will be doing good things for memory consumption, because the  
mapped memory can be released to the OS without having to kill your  
app in low-memory situations (without paging it out on Mac OS X,  
but the iPhone doesn't page memory out).


I added an implementation of this approach to the testing program  
provided by Wagner (thanks!) and it loads + counts the words in  
0.084 seconds on the device.  That's anywhere from around 50 - 100  
times faster than the other methods implemented in DictTest  
(plist / xml / txt ).  On the simulator, it runs in 0.043 seconds,  
so around 30-40 times faster than the other methods.


Download can be found here:

http://www.metaobject.com/downloads/Objective-C/DictTest.tgz

You mentioned that you were OK with search performance, so I won't  
go into that.


Cheers,

Marcel


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Re: Importing Word doc in Carbon app via Cocoa

Foundation memory management for CoreFoundation programmers, in brief:
   * the Create rule becomes the you own all references returned by a
method beginning with new, copy, or alloc
   * the Get rule becomes you do not own any references returned by a
method beginning with anything else
   * CFRetain(CFTypeRef blah) becomes [blah retain].
   * CFRelease(CFTypeRef blah) becomes [blah release] or [blah
autorelease]. See below for more on autoreleasing.

The most common manifestation of this is [[NSBlah alloc] init] falls
under the Create rule, while [NSBlah blah] falls under the Get rule.
You see a lot more use of the Get rule because of Foundation's use of
autorelease pools.

get methods in Foundation generally have nothing to do with the Get
rule. Foundation uses a get-prefixed method (like -getBlah:buffer) to
indicate that a value will be returned by reference in the provided
argument; sometimes you must provide the memory, sometimes it will be
allocated for you – check the documentation to figure out what's going
on.

You are responsible for releasing via -release any owning references
returned to you per the Foundation variation on the Create rule.

You can release those references either directly and immediately via
-release, or indirectly via -autorelease, at which point the topmost
autorelease pool takes ownership of the reference from you. The
autorelease pool stack is generally popped at the end of each cycle
through the event loop.

If you are not using a Cocoa event loop, you are responsible for
setting up an autorelease pool and draining the pool when you are done
with it.

Sending the pool a -drain message (available in Mac OS X 10.4 and
later) is preferable to sending it a release message, because drain
will trigger a garbage collection if necessary in a garbage-collected
environment (otherwise functioning as -release in a reference-counted
environment), while -release is purely a no-op in a garbage-collected
environment.

—Jeremy

On Thu, Apr 16, 2009 at 11:57 AM, Steve Mills smi...@multi-ad.com wrote:
 On Apr 16, 2009, at 10:44:07, Jesper Storm Bache wrote:

 You'll want to read Cocoa memory management:

 http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmObjectOwnership.html#//apple_ref/doc/uid/2043

 The general rule is that if you do *not* create an instance by using [[X
 alloc] initZZ] then you should *not* call release (because your instance has
 been auto released).


 Thanks for the help, everyone. I hope I remember the rules the next time I
 have to deal with Cocoa.

 _
 Steve Mills                              Me: 952-401-6255
 Senior Software Architect                         MultiAd
 smi...@multiad.com                       www.multi-ad.com


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Re: Importing Word doc in Carbon app via Cocoa

2009-04-16 Thread Randall Meadows


On Apr 16, 2009, at 11:43 AM, Jeremy W. Sherman wrote:


Foundation memory management for CoreFoundation programmers, in brief:
 * the Create rule becomes the you own all references returned by a
method beginning with new, copy, or alloc
 * the Get rule becomes you do not own any references returned by a
method beginning with anything else


pedantic
s/beginning with/containing/g
/pedantic

mutableCopy would not be included otherwise.

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Re: Reading in dictionary from txt file: options for speed



On Apr 16, 2009, at 10:10 , Miles wrote:

Marcel, NOW we're talking. This has really been such an eye-opening  
thread.


Now it's googling time to try to figure out how to search for a  
string in there.


1.	Get the bytes out of your search string in the encoding that your  
dictionary is in
2.	surround with '\n' characters to make sure you find whole words,  
not substrings

(you will need to add a leading '\n' to your strings file
3.  Use  strnstr()  --   man strnstr()

Cheers,

Marcel

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Re: IsBadCodePtr in Cocoa or Unix?

2009-04-16 Thread Colin Cornaby

I would suggest reading Microsoft's own notes on that function, which  
might tell you why it's a bad idea to use that function even under  
Windows, and give you a clue on how to do something similar on other  
platforms. You should probably look at catching a SIGSEGV, which  
should be possible, and is still a ridiculously bad idea (if the  
Microsoft warnings weren't enough).


Also, just a note, the function is deprecated on Windows, and if it's  
deprecated on Windows, that's probably a good reason not to use it or  
anything similar. :)



On Apr 16, 2009, at 11:09 AM, Eric Gorr wrote:

I was wondering if anyone knows of a Cocoa or Unix based equivalent  
for this window function...?


http://msdn.microsoft.com/en-us/library/aa366712(VS.85).aspx

Thanks.

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Re: IsBadCodePtr in Cocoa or Unix?

2009-04-16 Thread Clark Cox

On Thu, Apr 16, 2009 at 11:09 AM, Eric Gorr mail...@ericgorr.net wrote:
 I was wondering if anyone knows of a Cocoa or Unix based equivalent for this
 window function...?

Not really. And if you're at the point where you're asking whether or
not a pointer is bad in production code, you've already failed :)

What problem are you actually trying to solve, perhaps there is a better way.

Even on Windows, the use of that function is discouraged (as indicated
by the documentation that you linked to):

IsBadXxxPtr should really be called CrashProgramRandomly

Often I'll see code that tries to protect against invalid pointer
parameters. This is usually done by calling a function like
IsBadWritePtr. But this is a bad idea. IsBadWritePtr should really be
called CrashProgramRandomly.
The documentation for the IsBadXxxPtr functions presents the technical
reasons why, but I'm going to dig a little deeper. For one thing, if
the bad pointer points into a guard page, then probing the memory
will raise a guard page exception. The IsBadXxxPtr function will catch
the exception and return not a valid pointer. But guard page
exceptions are raised only once. You just blew your one chance...

 http://msdn.microsoft.com/en-us/library/aa366712(VS.85).aspx

 Thanks.

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-- 
Clark S. Cox III
clarkc...@gmail.com
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Re: IsBadCodePtr in Cocoa or Unix?

2009-04-16 Thread Eric Gorr



On Apr 16, 2009, at 2:21 PM, Clark Cox wrote:

On Thu, Apr 16, 2009 at 11:09 AM, Eric Gorr mail...@ericgorr.net  
wrote:
I was wondering if anyone knows of a Cocoa or Unix based equivalent  
for this

window function...?


Not really. And if you're at the point where you're asking whether or
not a pointer is bad in production code, you've already failed :)


I agree.

What problem are you actually trying to solve, perhaps there is a  
better way.


It's actually not my problem, so I can't say for sure. I was just  
asked by someone who is porting some Windows code to the Mac what an  
equivalent function was and I didn't know. They wanted an answer, so I  
asked here for them.



Even on Windows, the use of that function is discouraged (as indicated
by the documentation that you linked to):

IsBadXxxPtr should really be called CrashProgramRandomly


Interesting. I didn't actually read it, but was just told it was the  
function they were using.


I will forward your answer on and perhaps try to get some more  
information on what they are trying to do and why.

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Re: IsBadCodePtr in Cocoa or Unix?

2009-04-16 Thread Douglas Davidson



On Apr 16, 2009, at 11:21 AM, Colin Cornaby wrote:

I would suggest reading Microsoft's own notes on that function,  
which might tell you why it's a bad idea to use that function even  
under Windows, and give you a clue on how to do something similar on  
other platforms. You should probably look at catching a SIGSEGV,  
which should be possible, and is still a ridiculously bad idea (if  
the Microsoft warnings weren't enough).


As everyone has noted, there are good reasons why ordinary code should  
not start examining pointers handed to it for validity.  However,  
there are occasionally debugging situations in which there are  
legitimate reasons to want to know whether a particular range of  
memory is mapped, and how.  Typically one would use gdb and other  
tools to examine the address space, but if for some reason you need to  
do so programmatically, it is possible to find out all sorts of  
information about the address space of a process via various Mach  
APIs.  This is pretty deep stuff, so I won't even start to explain it  
in a mail message; if you want to do it, you had better understand it  
thoroughly.


Douglas Davidson

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Re: Reading in dictionary from txt file: options for speed

It looks like I have the search working like this, but I have to
double-space the dictionary file to have a leading \n.

NSString *searchStr= @\njoy\n;
NSData *strData= [searchStr
dataUsingEncoding:NSUTF8StringEncoding];
const char *strBytes= [strData bytes];
const char *fileBytes= [stringFileContents bytes];
char *ptr= strstr(fileBytes, strBytes);

Is that what you were thinking?
Thanks!




On Thu, Apr 16, 2009 at 11:47 AM, WT jrca...@gmail.com wrote:

 Marcel,

 since he'll be dealing with the string's raw bytes, won't Miles have to
 manually add a null byte to terminate the search string?

 Wagner


 On Apr 16, 2009, at 7:57 PM, Marcel Weiher wrote:


 On Apr 16, 2009, at 10:10 , Miles wrote:

  Marcel, NOW we're talking. This has really been such an eye-opening
 thread.

 Now it's googling time to try to figure out how to search for a string in
 there.


 1.  Get the bytes out of your search string in the encoding that your
 dictionary is in
 2.  surround with '\n' characters to make sure you find whole words,
 not substrings
(you will need to add a leading '\n' to your strings file
 3.  Use  strnstr()  --   man strnstr()

 Cheers,

 Marcel



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BAS use of asl_log()

2009-04-16 Thread Todd Heberlein

I am looking the Apple's Better Authorization Sample code to figure  
out how to launch privileged helper tools from a Cocoa app. The BAS  
code includes use of asl_log(), but sometimes the format field is a  
string literal like:


err = asl_log(asl, aslMsg, ASL_LEVEL_ERR, Request failed: %m);


and sometimes format is a variable like:

const char * errStr = NULL;
...
errStr = Unexpected error while accepting a connection: %m;
...
err = asl_log(asl, aslMsg, ASL_LEVEL_ERR, errStr);


Is there a requirement that at compile time the format field be  
known (as in the first example), or can it also be generated at run  
time (as in the second condition)?


Thanks,

Todd

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Re: QTMovieDidEndNotification

2009-04-16 Thread Seth Willits


On Apr 14, 2009, at 4:59 PM, Tilo Villwock wrote:

i have a list with QTMovie objects which are supposed to be played  
one after another. Now, to recognize when a movie has finished  
playing i registered for the QTMovieDidEndNotification. For some  
reason though this notification is sometimes posted several times  
leading to a somewhat random behaviour, so that some movie objects  
are sometimes skipped and sometimes it works. Has anyone experienced  
something similar? Any suggestions?


I've never had a problem with it. My guess is something in your code  
is causing multiple end notifications?




--
Seth Willits



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Simulating a click in NSStepper

2009-04-16 Thread David Alter

I'm using a NSStepper with the little up and down arrows. I want to simulate
a click where the correct arrow will get highlighted as if someone clicked
into it. I'm unclear how I should do this. I can do a perform click but that
does not specify what arrow to click.
Any suggestions?

thanks for the help
-dave
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Setting a layer delegate affects drawRect being called

2009-04-16 Thread Mohan Parthasarathy

Hi,

I have a View whose drawRect method never gets called when I call [View
setNeedsDisplay]. It looks like the reason is that the View's layer delegate
is been set and If I remove that drawRect is called. Is this an expected
behavior or something else is going on ?

thanks
-mohan
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Create folder in protected directory

2009-04-16 Thread Chris Purcell


Hello everyone,

My App has to create a folder in a directory owned by the system.  How  
would I go about doing this, do I need to use the security framework  
and get the user to authenticate themselves as an admin?


Thanks!

--Chris


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Re: BAS use of asl_log()



On 2009 Apr 16, at 12:40, Todd Heberlein wrote:


err = asl_log(asl, aslMsg, ASL_LEVEL_ERR, Request failed: %m);
...
err = asl_log(asl, aslMsg, ASL_LEVEL_ERR, errStr);

Is there a requirement that [a] at compile time the format field  
be known (as in the first example), or [b] can it also be generated  
at run time (as in the second condition)?


Looks like the answer, by example, is (b), Todd.  If you have any  
doubts, you can get the documentation for asl_log by option-clicking  
it in Xcode, or in Xcode's Help menu click Open man page, then type  
in asl_log.


If the documentation is ambiguous, as it sometimes is on these bsd- 
level functions, I believe the appropriate place to ask questions  
would be darwin-ker...@lists.apple.com.  They give good help over there.


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Re: Reading in dictionary from txt file: options for speed

Also, any idea why these lines would give different results in different
projects?

NSString *searchStr= @\njoy\n;
NSData *strData= [searchStr
dataUsingEncoding:NSUTF8StringEncoding];
const char *strBytes= [strData bytes];

When this code is in the project you sent, strBytes shows '\njoy\n' in the
debugger (which is what I'd expect), but when i copy the exact code to a
different project strBytes shows extra memory stuff after it, like
'\njoy\n\x1b\x14\xc0'

Seems very odd.





On Thu, Apr 16, 2009 at 12:01 PM, Miles vardpeng...@gmail.com wrote:


 It looks like I have the search working like this, but I have to
 double-space the dictionary file to have a leading \n.

 NSString *searchStr= @\njoy\n;
 NSData *strData= [searchStr
 dataUsingEncoding:NSUTF8StringEncoding];
 const char *strBytes= [strData bytes];
 const char *fileBytes= [stringFileContents bytes];
 char *ptr= strstr(fileBytes, strBytes);

 Is that what you were thinking?
 Thanks!





 On Thu, Apr 16, 2009 at 11:47 AM, WT jrca...@gmail.com wrote:

 Marcel,

 since he'll be dealing with the string's raw bytes, won't Miles have to
 manually add a null byte to terminate the search string?

 Wagner


 On Apr 16, 2009, at 7:57 PM, Marcel Weiher wrote:


 On Apr 16, 2009, at 10:10 , Miles wrote:

  Marcel, NOW we're talking. This has really been such an eye-opening
 thread.

 Now it's googling time to try to figure out how to search for a string
 in there.


 1.  Get the bytes out of your search string in the encoding that your
 dictionary is in
 2.  surround with '\n' characters to make sure you find whole words,
 not substrings
(you will need to add a leading '\n' to your strings file
 3.  Use  strnstr()  --   man strnstr()

 Cheers,

 Marcel




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NSView modifies CALayer's masksToBounds?

2009-04-16 Thread Mike Manzano

Is there a way to stop an NSView from modifying its CALayer's  
masksToBounds property?


It looks like it's making the change during a frame resize. It's  
making a call to some internal selector called  
_updateLayerMasksToBoundsFromView. AFAIK, there's no way to turn on or  
off masking from the NSView level, except for maybe - 
wantsDefaultClipping. Is that the way to do it?


Thanks,

Mike
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Quickie question on text edit cycle (and textDidEndEditing notification)

2009-04-16 Thread Luke Evans


Hello Cocoa listers.

What is the best/right way to obtain the context object for a piece of  
text that has been edited by the editing system (i.e. in a cell in  
NSOutlineView) once the textDidEndEditing notification is delivered to  
an observer?


This is the second or third time I have added text editors in controls  
where I've wanted to capture the final state of the editor to set it  
into an object (i.e. not doing this automatically with binding).
Each case has been a bit different.  In this case I have a fairly  
straight-forward NSOutlineView and a custom cell really just to do  
some specific text editing stuff.


Pretty much everything is working fine - but unlike previous occasions  
when I have used the field editor, in this case once I get my  
textDidEndEditing notification, I need to find the object that the  
editor is representing in order to update a property.  What I'm  
wondering is how this is _supposed_ to be done.


The actual notification of textDidEndEditing does not include much  
contextual information AFAICS.  It does provide you with the NSText  
object that handled the editing, from which I can happily get the  
final text.
However, I'm not sure what the best practice is for obtaining the  
'represented object' to which this text should be assigned.  I've  
chosen to implement the notification method in my custom cell class,  
which works fine, but the instance of this cell appears is not  
initialised with outlineView:willDisplayCell:forTableColumn:item.   
Therefore the cell's representedObject is nil and I cannot use this  
way to get the context.


I could simply ask the control (the outline view) what the currently  
selected row is, and get the object to update from the arrangedObjects  
of my NSTreeController.  This seems a very 'long way round' though.  I  
suspect I'm simply missing some way to have the editing system  
remember a context object for me and pick it up later (but I don't see  
anything obviously doing this in the NSText interface, that I'm  
guaranteed to be able to obtain and use from the textDidEndEditing  
notification).


-- Luke



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Re: Create folder in protected directory

2009-04-16 Thread Chris Purcell

Thanks for reply Kyle.  The app restores a user's user folder and  
needs to recreate that folder within the /Users directory.  Is there  
an easier way to accomplish this then having to use the Authorization  
services C library?




On Apr 16, 2009, at 3:53 PM, Kyle Sluder kyle.slu...@gmail.com wrote:

On Thu, Apr 16, 2009 at 5:59 PM, Chris Purcell haroldthehun...@mac.com 
 wrote:
My App has to create a folder in a directory owned by the system.   
How would
I go about doing this, do I need to use the security framework and  
get the

user to authenticate themselves as an admin?


Yes, the Security framework is necessary here, but the more important
question is why you need to do this.

--Kyle Sluder

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Re: Reading in dictionary from txt file: options for speed

2009-04-16 Thread Greg Guerin


Miles wrote:


NSString *searchStr= @\njoy\n;
NSData *strData= [searchStr
dataUsingEncoding:NSUTF8StringEncoding];
const char *strBytes= [strData bytes];


Think about what you're doing here, then look at the NSString method - 
UTF8String.


Also, think about whether dataUsingEncoding: includes or excludes a  
terminating null.  For example, if searchStr were assigned @, what  
is the length of the resulting strData, and exactly what does  
[strData bytes] return?  A combination of referring to reference docs  
and some experimenting is the usual approach here.


Next, consider the above in light of the args to strstr(), which are  
expected to be null-terminated C-style strings.


Finally, consider what happens if searchStr isn't found.  I urge you  
to try it with a searchStr assigned a misspelled word like @spelchek.


If it seems like I'm asking you to debug and understand your own code  
without asking the list for the complete answer, you're right.  This  
is a pretty elementary example to work on, and there's no substitute  
for being able to figure it out for yourself.  If you can't debug  
this one without direct assistance, you will be lost at sea when the  
debugging gets harder (and it WILL get harder).


  -- GG
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Re: Reading in dictionary from txt file: options for speed

2009-04-16 Thread Scott Ribe

No null terminator... Now it's perfectly possible the bytes will get written
into a zeroed block, and so there will be a null terminator purely by chance
some times, and not other times.

Why the NSData? Why not just get a C string from searchStr, if that's what
you want? Otherwise, in general an NSData is not a string; it won't end with
a 0 byte unless you put one there, and it can contain 0s mid-stream as well.
That's why it's got an explicit length.

-- 
Scott Ribe
scott_r...@killerbytes.com
http://www.killerbytes.com/
(303) 722-0567 voice


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Re: Reading in dictionary from txt file: options for speed

I'm all for just a little guidance, and thank you for it. Everything you
said makes sense now, and I have it working:

NSString *searchStr= @\nJOY\n;
const char *cString = [searchStr UTF8String];
const char *fileBytes  = [stringFileContents bytes];
char *ptr= strstr(fileBytes, cString);

Thanks again




On Thu, Apr 16, 2009 at 4:43 PM, Greg Guerin glgue...@amug.org wrote:

 Miles wrote:

 NSString *searchStr= @\njoy\n;
NSData *strData= [searchStr
 dataUsingEncoding:NSUTF8StringEncoding];
const char *strBytes= [strData bytes];


 Think about what you're doing here, then look at the NSString method
 -UTF8String.

 Also, think about whether dataUsingEncoding: includes or excludes a
 terminating null.  For example, if searchStr were assigned @, what is the
 length of the resulting strData, and exactly what does [strData bytes]
 return?  A combination of referring to reference docs and some experimenting
 is the usual approach here.

 Next, consider the above in light of the args to strstr(), which are
 expected to be null-terminated C-style strings.

 Finally, consider what happens if searchStr isn't found.  I urge you to try
 it with a searchStr assigned a misspelled word like @spelchek.

 If it seems like I'm asking you to debug and understand your own code
 without asking the list for the complete answer, you're right.  This is a
 pretty elementary example to work on, and there's no substitute for being
 able to figure it out for yourself.  If you can't debug this one without
 direct assistance, you will be lost at sea when the debugging gets harder
 (and it WILL get harder).

  -- GG

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Re: Setting up an auxiliary task for use with Distributed Objects

2009-04-16 Thread Ken Thomases


On Apr 16, 2009, at 4:01 AM, Oleg Krupnov wrote:


2) How do I quit the aux task? [NSTask terminate] does not work,
invalidating the connection does not work...


First, your MyVendedObject class should expose a method for the client  
to request that the server terminate.


Then, you can change your code...

MyVendedObject* vendedObj = [[[MyVendedObject alloc] init]  
autorelease];


NSConnection* connection = [NSConnection defaultConnection];
[connection setRootObject:vendedObj];
if ([connection registerName:@MyAuxTask])
{


Replace this line:


[[NSRunLoop currentRunLoop] run];


with something like:

while ([vendedObj shouldKeepRunning])
		[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate: 
[NSDate distantFuture]];



}






1) I need to block the main task until the aux task is ready to work.
How do I do it? Sleep/poll connection/repeat doesn't seem a good
approach, is there any better way?


Have you considered reversing the roles of the two processes, in terms  
of which is the server and which the client?


You can have the main task register a connection under a known name.   
It will vend an object with which the auxiliary task will register.   
It will start the auxiliary task.  The auxiliary task will obtain the  
vended object from the main task using the known name.  The auxiliary  
task will create a worker object.  It will pass that worker object to  
the main task in a check-in message.  It will then run the run loop in  
the manner illustrated above.  The main task will passively receive a  
reference (proxy) for the auxiliary task's worker object.  It can then  
invoke methods of that object just as it would in the design you were  
working with.


Regards,
Ken

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Re: Create folder in protected directory

On Thu, Apr 16, 2009 at 7:23 PM, Chris Purcell haroldthehun...@mac.com wrote:
 Thanks for reply Kyle.  The app restores a user's user folder and needs to
 recreate that folder within the /Users directory.  Is there an easier way to
 accomplish this then having to use the Authorization services C library?

Ah.  I'm afraid not, at least not directly.  I think there's some
machinery in the OS to recreate a skeleton home directory for users,
but that might only be involved in a network environment.

Make sure to read and understand the BetterAuthorizationSample and the
security implications mentioned therein.  Also read up on messages
regarding AuthorizationExecuteWithPrivileges on this list (maybe also
the CDSA list as well?  I'm not a subscriber).

Good luck,
--Kyle Sluder
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Re: Reading in dictionary from txt file: options for speed

On Thu, Apr 16, 2009 at 8:09 PM, Miles vardpeng...@gmail.com wrote:
    char *ptr                        = strstr(fileBytes, cString);

OK, this makes sense, but you're still doing a linear scan through the
data you've loaded (and I'm assuming creating NSString objects from
what you find because plain old C strings will be pretty useless to
you otherwise).  You might very well find that storing the plist
representation winds up being faster or saving you from some code in
the future.  Particularly if you are doing lookups in the dictionary
based on user input, because Unicode is tricky with what is considered
equal.

--Kyle Sluder
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Re: NSView modifies CALayer's masksToBounds?

On Thu, Apr 16, 2009 at 7:14 PM, Mike Manzano
m...@instantvoodoomagic.com wrote:
 Is there a way to stop an NSView from modifying its CALayer's masksToBounds
 property?

The layer that backs a layer-backed view is Not Yours(TM).  If you
want control over the layer, you need to use a layer-hosted view.
This means you might have to do a lot more work to keep AppKit's view
of the world in sync with your layer tree.

--Kyle Sluder
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Re: Simulating a click in NSStepper

2009-04-16 Thread Nick Zitzmann



On Apr 16, 2009, at 3:13 PM, David Alter wrote:

I'm using a NSStepper with the little up and down arrows. I want to  
simulate
a click where the correct arrow will get highlighted as if someone  
clicked
into it. I'm unclear how I should do this. I can do a perform click  
but that

does not specify what arrow to click.
Any suggestions?



You can do this by creating fake mouse down and mouse up events, and  
add them to the application's event queue so that the mouse down event  
is handled before the mouse up event. See the NSEvent documentation  
for details on how to make your own events.


Nick Zitzmann
http://www.chronosnet.com/



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Re: Reading in dictionary from txt file: options for speed



On Apr 16, 2009, at 12:01 , Miles wrote:



It looks like I have the search working like this, but I have to  
double-space the dictionary file to have a leading \n.


No, you just need one initial extra newline at the start, the newline  
from the end of the last string matches up with the starting newline  
of the modified search string.




NSString *searchStr= @\njoy\n;
NSData *strData= [searchStr  
dataUsingEncoding:NSUTF8StringEncoding];

const char *strBytes= [strData bytes];
const char *fileBytes= [stringFileContents bytes];
char *ptr= strstr(fileBytes, strBytes);

Is that what you were thinking?


Roughly.

-(BOOL)containsString:(NSString*)searchString
{
	int stringLen=[searchString  
lengthOfBytesUsingEncoding:NSUTF8StringEncoding];

if ( stringLength  200 ) {
char buffer[ stringLen +4 ];
char *ptr;
buffer[0]='\n';
		[searchString getBytes:buffer+1 maxLength:stringLen usedLength:NULL  
encoding:NSUTF8StringEncoding options:0 range:NSMakeRange(0,stringLen)  
remainingRange:NULL];

buffer[stringLen+1]='\n';
buffer[stringLen+2]=0;
		ptr = strnstr([stringFileContents bytes], buffer,  
[stringFileContents length] );

return ptr != NULL;
}
}


1.	I use a local buffer and copy the string into that, and assume you  
don't have words with more than 200 characters.

2.  I copy the newlines into that buffer and null terminate it.

	- Your method is probably just as good, except that you need to null  
terminate your strings, not sure that happens.


3.	I use strnstr() instead of strstr() because the dict isn't null  
terminated either.



Cheers,

Marcel

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Re: -viewDidMoveToWindow without subclassing? NSViewController?

2009-04-16 Thread Graham Cox



On 17/04/2009, at 1:43 AM, Jerry Krinock wrote:

The other way around, Graham.  I need the window controller, so I  
get it from -window.  See below.



I don't see why you need to get this from an item in a tab view?
You talk about the need to initialise something. What? How? What  
are you trying to do?


In general, I need the document during initialization, so I do

  [[[aView window] windowController] document]

Here are two examples of why I need the document:

*  In an NSPredicateEditor subclass, during -viewDidMoveToWindow,  
creating the row templates requires a reference to the document's  
managed object context, so it can get attribute types.  See code [1].


*  In an NSOutlineView subclass, during -viewDidMoveToWindow, I need  
to initialize and set a data source, which needs a (weak) reference  
to the document in order to get data objects.  See code [2].


Is this an abnormal design pattern?  I think I've seen people set  
their document as nib File's Owner, but I can't do that since my  
document is sometimes instantiated without a window.  My nib File's  
Owner is a window controller.



This does sound like an abnormal design pattern. The controller should  
be in charge, so going from view - window - controller - document  
seems backwards. The controller's initialization (whether at  
awakeFromNib or windowDidLoad time) should be handling this, so you  
can do self - document to access the document. The controller is  
responsible for forging the necessary links and set up between any  
views it knows about and the document. The view definitely shouldn't  
be doing this, the controller definitely should be.


I've not used NSPredicateEditor, so I'm not familiar with it, but as a  
view it shouldn't be talking directly to the data model. Instead, the  
controller should give it what it needs as appropriate.


The same pattern definitely applies to NSOutlineView, which I am  
familiar with. The controller is typically its datasource, which you  
can set in IB. The controller then gathers data from the real  
datasource (the document, say) and presents it to the view.  
Effectively the controller proxies the data from the document on  
demand. This approach requires no special initialisation - the  
NSOutlineView won't ask for data until it's ready to display it, at  
which point it must by definition be visible and in a window. The  
controller can then just fetch (and possibly cache) data from the  
document and return it to the outline view in the usual way. I'd be  
surprised if the same technique would be inappropriate for the  
predicate editor also.


Trying to hook into certain moments like when a view is moved to the  
window sounds error prone, tricky, and unnecessary. I've never found  
the need to do that sort of thing using window controllers - let the  
views come to the window controller for their data, and let the window  
controller be in charge of obtaining it. It seems like you're trying  
to short-circuit the controller and simply using it to make a direct  
connection between the document and the view - this is probably where  
you're going wrong. Place the controller in the data pathway, don't  
just use it to make a pathway directly between data model and view.


--Graham


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Re: NSView modifies CALayer's masksToBounds?

2009-04-16 Thread Mike Manzano


The example in the docs say:

CoreAnimationdoesn'tprovideameansforactuallydisplayinglayersinawindow
, theymustbehostedby
aview. Whenpairedwithaview, theviewmustprovideevent- 
handlingfortheunderlyinglayers, whilethe

layersprovidedisplayofthecontent.

In the sample code, here is the example given to put a layer into a  
view:


[theView setLayer: theRootLayer];
[theView setWantsLayer:YES];

Is this what you mean by a layer-hosted view? If so, does that mean  
that theRootLayer is mine to manage as I wish?


Currently, I am just modifying the layer given to the view after I  
call -setWantsLayer on it. How is this layer different from  
theRootLayer in the example?


Thanks,

Mike

On Apr 16, 2009, at 5:33 PM, Kyle Sluder wrote:


On Thu, Apr 16, 2009 at 7:14 PM, Mike Manzano
m...@instantvoodoomagic.com wrote:
Is there a way to stop an NSView from modifying its CALayer's  
masksToBounds

property?


The layer that backs a layer-backed view is Not Yours(TM).  If you
want control over the layer, you need to use a layer-hosted view.
This means you might have to do a lot more work to keep AppKit's view
of the world in sync with your layer tree.

--Kyle Sluder




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Re: Reading in dictionary from txt file: options for speed

I'm creating a game for where the dictionary file will never get modified,
so I'm not really worried about that. The strings that I am searching for
are not from user input, but from user selection, so I'm guaranteed to have
the case be correct -- so I don't need to worry about upper vs lower-case
for this. You can think of it in the context of something like the game
Wurdle, where the user selects those scrabble-like tiles and the tiles each
have a predefined character associated with it.

Yes, the original suggestion to use strstr(). It is slow, for a word that's
never found it takes 0.704 seconds on the device. Definitely too long.

To answer your other questions...

It's initalized like this:
NSString *filePath = [[NSBundle mainBundle]
  pathForResource: @dictionary
  ofType: @txt];

stringFileContents = [[NSData alloc]
initWithContentsOfMappedFile:filePath];





On Thu, Apr 16, 2009 at 5:55 PM, Greg Guerin glgue...@amug.org wrote:

 Miles wrote:

 const char *fileBytes  = [stringFileContents bytes];
char *ptr= strstr(fileBytes, cString);



 Are you certain the bytes returned by [stringFileContents bytes]
 null-terminated?  How was that data initialized?  If it's reading from a
 file, is there guaranteed to be a null-terminator in the file?  What happens
 if there isn't?   Suppose the file gets edited and loses any overt
 null-terminator you have now, what will your program do?


 Was the original suggestion to use strstr(), or was there a similar
 function with a length?



 You also need to think about case-sensitivity, because searching for joy,
 Joy, joY, or JOY might be different depending on where the search-term
 is coming from, and what letter-case means (or doesn't mean) in context.



 And what is the context?  I don't think you ever said what you were trying
 to accomplish with this dictionary and searching in it.



 And since you have the words options for speed in the Subject, it's
 possible that strstr()'s linear search could be a speed problem.  Or it's
 possible that linear search is fine (for worst-case, test it with a word
 that you know isn't anywhere in the dictionary).  And that goes back to the
 What are you trying to accomplish? question, now that the how to has
 been more or less answered, at least for one case.


  -- GG

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Re: NSView modifies CALayer's masksToBounds?

On Thu, Apr 16, 2009 at 9:17 PM, Mike Manzano
m...@instantvoodoomagic.com wrote:
 [theView setLayer: theRootLayer];
 [theView setWantsLayer:YES];

 Is this what you mean by a layer-hosted view? If so, does that mean that
 theRootLayer is mine to manage as I wish?

Yes.  If you set the layer before calling -setWantsLayer:, you get a
layer-hosted view (think of it as AppKit saying I will allow the view
you provided to host this view.)  On the other hand, if you call
-setWantsLayer: without calling -setLayer:, AppKit creates a private
view and says Mine!.

--Kyle Sluder
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Re: Reading in dictionary from txt file: options for speed

2009-04-16 Thread Michael Ash

On Thu, Apr 16, 2009 at 2:47 PM, WT jrca...@gmail.com wrote:
 Marcel,

 since he'll be dealing with the string's raw bytes, won't Miles have to
 manually add a null byte to terminate the search string?

The strnstr() function takes a length, and can thus be safely used on
buffers which contain no NUL byte.

On Tiger and earlier, strnstr() had a bug where it could read one byte
past the length specified, which could cause a crash in certain
circumstances. Had a grand old time tracking that one down, I did. It
was eventually fixed in a security update, and I believe it was fixed
in Leopard from the start.

Mike
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[SOLVED] Re: NSView modifies CALayer's masksToBounds?

2009-04-16 Thread Mike Manzano


That did it. Thanks!

One last question. If I supply my own layer, is it legal to add  
subviews to the view that's hosting my layer?


On Apr 16, 2009, at 6:46 PM, Kyle Sluder wrote:


On Thu, Apr 16, 2009 at 9:17 PM, Mike Manzano
m...@instantvoodoomagic.com wrote:

[theView setLayer: theRootLayer];
[theView setWantsLayer:YES];

Is this what you mean by a layer-hosted view? If so, does that  
mean that

theRootLayer is mine to manage as I wish?


Yes.  If you set the layer before calling -setWantsLayer:, you get a
layer-hosted view (think of it as AppKit saying I will allow the view
you provided to host this view.)  On the other hand, if you call
-setWantsLayer: without calling -setLayer:, AppKit creates a private
view and says Mine!.

--Kyle Sluder




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Re: Reading in dictionary from txt file: options for speed



On Apr 16, 2009, at 18:59 , Michael Ash wrote:


On Thu, Apr 16, 2009 at 2:47 PM, WT jrca...@gmail.com wrote:
since he'll be dealing with the string's raw bytes, won't Miles  
have to

manually add a null byte to terminate the search string?


The strnstr() function takes a length, and can thus be safely used on
buffers which contain no NUL byte.


As far as I can tell it only takes one length, and that's for the  
string to be searched, so he will have to NULL-terminate the search  
string (which is what WT was talking about as far as I can tell).   
Well that would be the case if strnstr() were actually useful for him,  
which I guess it isn't.



On Tiger and earlier, strnstr() had a bug where it could read one byte
past the length specified, which could cause a crash in certain
circumstances. Had a grand old time tracking that one down, I did. It
was eventually fixed in a security update, and I believe it was fixed
in Leopard from the start.


Funky stuff!

Marcel

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Create Library of Media File

2009-04-16 Thread Bright

Hi,everyone
 Now, I am trying to write a music player app. So I want to create a 
Library to add my sound files to it. 
The function of the library is same as iTunes library.  
What's the principle of creating the Library? And,how to implement it?
   Any clues and documents about about is lucky for me.
Mac

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Core Data Fetches + Transient Properties + NSPredicateEditor = Sadness

The fact that Core Data cannot fetch using a predicate based on  
transient properties [1] seems to greatly limit the utility of the  
NSPredicateEditor view, and makes me very sad.


For example, say that my objects are student test results with a  
'score' attribute and two dozen other properties.  I could give the  
user an NSPredicateEditor and let them have oodles of fun constructing  
complex predicates.


But what if I need the user to be able to set a predicate with a left- 
side-expression of letter grade and a right-side-expression popup  
menu showing 'A' - 'F'.  If I could fetch based on a transient  
'letterGrade' attribute, I could implement some custom accessors which  
would calculate 'letterGrade' from 'score' as needed, the predicate  
emitted from the NSPredicateEditor would just work, and life would  
be sweet.


But since I can't use transient properties in my predicate, providing  
a popup like that in NSPredicateEditor seems to mean that I'm going to  
have to somehow deconstruct the compound predicate which Apple put so  
many man-years of engineering into, have Core Data do sub-fetches,  
then do my own filtering and put the results back together.  I fear  
that writing bug-free code to handle the general compound predicate  
would be very time-consuming, and also it would be MVC hell with my  
NSPredicateEditor subclass (view) code wanting to have model logic  
such as if score  93, letterGrade = 'A'.


Does anyone have any suggestions for a least worst workaround?

Thanks,

Jerry

[1] http://developer.apple.com/documentation/Cocoa/Conceptual/CoreData/Articles/cdFetching.html#/ 
/apple_ref/doc/uid/TP40002484

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Cocoa program without xib file

2009-04-16 Thread YongLi

Hello everyone:

I want to build a Cocoa program without xib file. But I can't find any
introductions or tutorials.
Does anybody know where I can find those source?

best wishes
YongLi
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Advice on server-side web service technology

2009-04-16 Thread Russell Cook

I am working on a custom Obj-C framework that I need to expose through web
services on an Xserve.  I am finding a serious lack of support for
server-side web services in the Cocoa frameworks.  My searching has turned
up little from others following this same path.  From what I have found,
these are my options:

- WebObjects (Java, is this still recommended for use? still supported and
maintained?)
- gSOAP (or other C/C++ technology in front of the Obj-C, little messy but
doable)
- Mono (web services would be easy, connecting it up to my Obj-C library may
be tricky)

Are there other options I am unaware of?  Your opinions on the best path to
follow?

Thanks.
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NSMetadataQueryDidUpdateNotification problem with volumes

2009-04-16 Thread Eddie Aguirre

I've setup a NSMetaDataQuery to search for particular file types.   
I've set the search scope to NSMetadataQueryLocalComputerScope.  The  
initial search phase works correctly.  The query returns all of the  
expected files on all of the local volumes.


Now if I add a file to the root volume I get the  
NSMetadataQueryDidUpdateNotification notification as expected.  But  
adding a file to any of the other local volume does not seem to fire  
the notification.  I know that spotlight is indexing the files because  
a similar search through the finder will return the newly added  
files.  Also if I restart my application the new files will be found  
in the initial search phase.  Is this a bug or am I missing something?


--
Eddie Aguirre
ed...@markzware.com

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Re: Cocoa program without xib file

2009-04-16 Thread Bill Bumgarner


On Apr 15, 2009, at 10:35 PM, YongLi wrote:

I want to build a Cocoa program without xib file. But I can't find any
introductions or tutorials.
Does anybody know where I can find those source?


What are you trying to do?

Building a Cocoa program without a MainMenu.xib [or MainMenu.nib] is  
possible, but it is not recommended, supported, or at all standard/ 
typical.


b.bum

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Re: [SOLVED] Re: NSView modifies CALayer's masksToBounds?

2009-04-16 Thread Scott Anguish


No.


On 2009-04-16, at 10:50 PM, Mike Manzano wrote:


That did it. Thanks!

One last question. If I supply my own layer, is it legal to add  
subviews to the view that's hosting my layer?




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Re: Cocoa program without xib file

2009-04-16 Thread Alex Kac

Please search the cocoa-dev archives. This is talked about at  
considerable length...


On Apr 16, 2009, at 12:35 AM, YongLi wrote:


Hello everyone:

I want to build a Cocoa program without xib file. But I can't find any
introductions or tutorials.
Does anybody know where I can find those source?

best wishes
YongLi
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Alex Kac - President and Founder
Web Information Solutions, Inc.

The optimist proclaims that we live in the best of all possible  
worlds; and the pessimist fears this is true.

-- James Clabell




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Re: Cocoa program without xib file

2009-04-16 Thread WT

Why would you want to do that? Even if it is possible, and I'm not  
sure it is, it would imply writing, debugging, and maintaining a  
zillion more lines of code, code that has already been written,  
debugged, and is maintained regularly by Apple. Also, like I said, it  
might not even be possible, since (a) so much of Cocoa is dependent on  
interface builder and (b) it might require access to private APIs that  
only Apple has access to.


Don't fight the APIs, unless you have a very good reason to do it. Do  
you have such a good reason?


Wagner

On Apr 16, 2009, at 7:35 AM, YongLi wrote:


Hello everyone:

I want to build a Cocoa program without xib file. But I can't find any
introductions or tutorials.
Does anybody know where I can find those source?

best wishes
YongLi
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Re: Cocoa program without xib file

2009-04-16 Thread mathew davis


Hello YongLi,

are you writing for osx or iphone?

http://ericasadun.com/

has sample code for iphone development, this sample code does not use  
xib files.



On 16/04/2009, at 3:35 PM, YongLi wrote:


Hello everyone:

I want to build a Cocoa program without xib file. But I can't find any
introductions or tutorials.
Does anybody know where I can find those source?

best wishes
YongLi
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Re: Cocoa program without xib file