date:20080620


Is there a way to create a new bundle from in Cocoa?

What I'd like to do is have a bundle in my app's Application Support  
folder to store some data generated by the user in my app.  I see  
plenty of methods to call to load bundles and check if a folder is a  
bundle, but not creating them.


Do I simply just create a folder and set a bit on it that the OS  
identifies as being a bundle or is there anything else special I have  
to do?


Thanks in advance,

Grant Limberg
[EMAIL PROTECTED]
LinkedIn: http://www.linkedin.com/in/grantlimberg
http://www.glsoftware.net

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Re: install_name_tool

2008-06-20 Thread Martin

Sometimes you just need someone to tell you to read *again* the man
page and actually try to understand what the words mean ;-)

Thanks Sherm!

-Martin

On Jun 20, 2008, at 12:25 PM, Sherm Pendley wrote:

On Fri, Jun 20, 2008 at 3:12 AM, Martin [EMAIL PROTECTED]
wrote:

Thanks for your answers but it's still not working here. Plus I
don't really
see why I should use -id option since what I really want to do is
*change*

one of the paths.

Straight from man install_name_tool:

-change old new
Changes the dependent shared library install name old
to new in
the specified Mach-O binary. More than one of these
options can
be specified. If the Mach-O binary does not contain
the old
install name in a specified -change option the
option is

ignored.

-id name
Changes the shared library identification name of
a dynamic
shared library to name. If the Mach-O binary is not
a dynamic
shared library and the -id option is specified it is
ignored.

You *have* read the man page for the tool you're using, right? :-)

$ install_name_tool -change
/Users/martin/Library/Frameworks/Foo.framework/Versions/A/Foo
@executable_path../../Frameworks/Foo.framework/Versions/A/Foo
Foo.framework/Foo

If any applications have linked against your framework using the old
install_name, you could use the -change option to update the apps'
references to your framework.

There are no error messages given by install_name_tool, it just
silently

does nothing...

That's what it's documented to, when -change is used and
Foo.framework/Foo has no external references to the given path.

install_name_tool -id
@executable_path/../Frameworks/Foo.framework/Versions/A/Foo

Re: Creating a Bundle via Code

2008-06-20 Thread Ken Thomases


On Jun 20, 2008, at 4:43 PM, Grant Limberg wrote:


Is there a way to create a new bundle from in Cocoa?

What I'd like to do is have a bundle in my app's Application Support  
folder to store some data generated by the user in my app.


Since it's just data, I think you want a package rather than a bundle,  
as such.  A package is a directory which the Finder and other system  
GUI presents to the user as a file.



Do I simply just create a folder and set a bit on it that the OS  
identifies as being a bundle or is there anything else special I  
have to do?


Sort of.  You don't set a bit on the folder.  You declare a document  
type in your application's Info.plist.  That document type would  
specify your custom folder name extension and indicate that it's a  
package document type.  This informs Launch Services (and the Finder,  
which relies on LS) that the folder is a package.


See the Bundle Programming Guide.  In particular, see the chapter on  
Document Packages, but don't limit yourself to that chapter.


http://developer.apple.com/documentation/CoreFoundation/Conceptual/CFBundles/
http://developer.apple.com/documentation/CoreFoundation/Conceptual/CFBundles/Concepts/DocumentBundles.html

Cheers,
Ken
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Re: Creating a Bundle via Code

2008-06-20 Thread Matt Long


This might help: 
http://www.cimgf.com/2008/05/13/from-hacker-to-microisv-custom-file-formats/

In essence you create a folder and set attributes on it as you  
suspected. Though these are referred to as packages instead of  
bundles. Take a look at NSFileManager. You can create a directory that  
hides the file extension.  You then have your open and save panels  
treat the file as a single file rather than a directory. You can also  
register a file extension with the OS so that when the file/bundle is  
double clicked it will open in your app.


Not sure if that's exactly what you wanted, but I'm not sure your  
storing user generated data this way in the Application Support folder  
is the best approach either. You probably want to support saving to  
files or use Core Data instead if you don't want custom file formats.


-Matt



On Jun 20, 2008, at 3:43 PM, Grant Limberg wrote:


Is there a way to create a new bundle from in Cocoa?

What I'd like to do is have a bundle in my app's Application Support  
folder to store some data generated by the user in my app.  I see  
plenty of methods to call to load bundles and check if a folder is a  
bundle, but not creating them.


Do I simply just create a folder and set a bit on it that the OS  
identifies as being a bundle or is there anything else special I  
have to do?


Thanks in advance,

Grant Limberg
[EMAIL PROTECTED]
LinkedIn: http://www.linkedin.com/in/grantlimberg
http://www.glsoftware.net

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Re: Creating a Bundle via Code

Initially I was storing the data in Core Data.  In my app, the user  
has the ability to attach an image to a record in Core Data.   
Unfortunately, changing from a JPEG to NSData inflates a 1.5MB JPEG to  
over 20 MB.  In talking with some folks at the local Cocoaheads  
meeting on wednesday, one person suggested making a bundle or package  
in Application Support to store the images and just have a referencing  
URL in the Core Data store. This is what I'm trying to do now.


Grant Limberg
[EMAIL PROTECTED]
LinkedIn: http://www.linkedin.com/in/grantlimberg
http://www.glsoftware.net

On Jun 20, 2008, at 3:22 PM, Matt Long wrote:


This might help: 
http://www.cimgf.com/2008/05/13/from-hacker-to-microisv-custom-file-formats/

In essence you create a folder and set attributes on it as you  
suspected. Though these are referred to as packages instead of  
bundles. Take a look at NSFileManager. You can create a directory  
that hides the file extension.  You then have your open and save  
panels treat the file as a single file rather than a directory. You  
can also register a file extension with the OS so that when the file/ 
bundle is double clicked it will open in your app.


Not sure if that's exactly what you wanted, but I'm not sure your  
storing user generated data this way in the Application Support  
folder is the best approach either. You probably want to support  
saving to files or use Core Data instead if you don't want custom  
file formats.


-Matt



On Jun 20, 2008, at 3:43 PM, Grant Limberg wrote:


Is there a way to create a new bundle from in Cocoa?

What I'd like to do is have a bundle in my app's Application  
Support folder to store some data generated by the user in my app.   
I see plenty of methods to call to load bundles and check if a  
folder is a bundle, but not creating them.


Do I simply just create a folder and set a bit on it that the OS  
identifies as being a bundle or is there anything else special I  
have to do?


Thanks in advance,

Grant Limberg
[EMAIL PROTECTED]
LinkedIn: http://www.linkedin.com/in/grantlimberg
http://www.glsoftware.net

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Re: Creating a Bundle via Code

2008-06-20 Thread j o a r



On Jun 20, 2008, at 3:28 PM, Grant Limberg wrote:

Initially I was storing the data in Core Data.  In my app, the user  
has the ability to attach an image to a record in Core Data.  
Unfortunately, changing from a JPEG to NSData inflates a 1.5MB JPEG  
to over 20 MB.  In talking with some folks at the local Cocoaheads  
meeting on wednesday, one person suggested making a bundle or  
package in Application Support to store the images and just have a  
referencing URL in the Core Data store. This is what I'm trying to  
do now.



It doesn't sound to me that you actually need to have a bundle. You  
can just store the image data as files in the file system.


I'm also curious as to why you decompress the JPEG file? If you got  
the image as a compressed JPEG, why not store it as is?


j o a r


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Re: Creating a Bundle via Code

2008-06-20 Thread Jerry Krinock


On 2008 Jun, 20, at 15:28, Grant Limberg wrote:

Initially I was storing the data in Core Data.  In my app, the user  
has the ability to attach an image to a record in Core Data.   
Unfortunately, changing from a JPEG to NSData inflates a 1.5MB JPEG  
to over 20 MB.


I was planning on doing something like that, but your results indicate  
a serious problem with Core Data if you've got very many of those  
images.  Are you storing it as an attribute of type Transformable, and  
not specifying a transformer so that it uses the default/archiver?


Jerry

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Re: Creating a Bundle via Code

As far as I know, you can't store a raw jpeg in Core Data directly  
without turning it into an NSData object first which in turn  
decompresses it.


Someone correct me if I'm wrong!

Grant Limberg
[EMAIL PROTECTED]
LinkedIn: http://www.linkedin.com/in/grantlimberg
http://www.glsoftware.net

On Jun 20, 2008, at 3:38 PM, j o a r wrote:



On Jun 20, 2008, at 3:28 PM, Grant Limberg wrote:

Initially I was storing the data in Core Data.  In my app, the user  
has the ability to attach an image to a record in Core Data.  
Unfortunately, changing from a JPEG to NSData inflates a 1.5MB JPEG  
to over 20 MB.  In talking with some folks at the local Cocoaheads  
meeting on wednesday, one person suggested making a bundle or  
package in Application Support to store the images and just have a  
referencing URL in the Core Data store. This is what I'm trying to  
do now.



It doesn't sound to me that you actually need to have a bundle. You  
can just store the image data as files in the file system.


I'm also curious as to why you decompress the JPEG file? If you got  
the image as a compressed JPEG, why not store it as is?


j o a r




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Re: Creating a Bundle via Code

2008-06-20 Thread j o a r



On Jun 20, 2008, at 3:43 PM, Grant Limberg wrote:

As far as I know, you can't store a raw jpeg in Core Data directly  
without turning it into an NSData object first which in turn  
decompresses it.



It sounds quite possible that Core Data only support images in the  
form of NSData. That said, I see no reason why you would have to  
decompress the JPEG to generate this NSData.


We need to know more about your application to provide more detailed  
assistance. Where do you get your JPEG images from? Over the network?  
From files in the file system? Pasted into an image view by the user?


It sounds like you go from JPEG - NSImage - NSData? Instead of  
creating a NSImage, how about just storing the JPEG as is to the file  
system first, and only later generating NSImages as needed for display  
in your application.


j o a r


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Re: Creating a Bundle via Code

Currently, the user drags an existing image from their filesystem to  
an NSImageView bound to an NSData attribute in the sqlite data store.   
This causes the decompression from 1.5MB to 20MB.  As you can see,  
this isn't exactly efficient.   Hence the question on package/bundle  
creation.  I'm wanting to just store the jpeg directly to disk and  
just store a URL to it in the sqlite data store.


Grant Limberg
[EMAIL PROTECTED]
LinkedIn: http://www.linkedin.com/in/grantlimberg
http://www.glsoftware.net

On Jun 20, 2008, at 3:53 PM, j o a r wrote:



On Jun 20, 2008, at 3:43 PM, Grant Limberg wrote:

As far as I know, you can't store a raw jpeg in Core Data directly  
without turning it into an NSData object first which in turn  
decompresses it.



It sounds quite possible that Core Data only support images in the  
form of NSData. That said, I see no reason why you would have to  
decompress the JPEG to generate this NSData.


We need to know more about your application to provide more detailed  
assistance. Where do you get your JPEG images from? Over the  
network? From files in the file system? Pasted into an image view by  
the user?


It sounds like you go from JPEG - NSImage - NSData? Instead of  
creating a NSImage, how about just storing the JPEG as is to the  
file system first, and only later generating NSImages as needed for  
display in your application.


j o a r




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Re: Creating a Bundle via Code

2008-06-20 Thread j o a r



On Jun 20, 2008, at 4:00 PM, Grant Limberg wrote:

Currently, the user drags an existing image from their filesystem to  
an NSImageView bound to an NSData attribute in the sqlite data  
store.  This causes the decompression from 1.5MB to 20MB.  As you  
can see, this isn't exactly efficient.   Hence the question on  
package/bundle creation.  I'm wanting to just store the jpeg  
directly to disk and just store a URL to it in the sqlite data store.



You can always re-compress the image file before writing it out to the  
file system. But that seems kind of silly...


I would suggest that you intercept the drag operation and copy the  
file directly. You should be able to do this quite easily if you  
subclass the image view:


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



j o a r



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SplashScreen issues

2008-06-20 Thread Damien Cooke


Hi all,
When creating a splash screen what condition do you use to decide when  
to close your splash screen?  Is there some obvious event that is  
triggered that I can use? do I use [window orderOut:self] to close it?  
Or is there a better way?


Thanks and Regards
Damien
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Re: Creating a Bundle via Code

2008-06-20 Thread Jens Alfke



On 20 Jun '08, at 4:00 PM, Grant Limberg wrote:

Currently, the user drags an existing image from their filesystem to  
an NSImageView bound to an NSData attribute in the sqlite data  
store.  This causes the decompression from 1.5MB to 20MB.


That's an issue with NSImageView — when an image is dragged into it,  
it converts it into an NSImage (in most cases, an uncompressed  
pixmap). It does not store the original image data at all. So the  
binding has no alternative but to convert from the NSImage back into  
data. I would guess it uses TIFF for that. PNG would give somewhat  
better compression, but it won't be close to JPEG. (But it would be a  
bad idea for it to use JPEG, because that would decrease image quality  
and eliminate the alpha channel.)


If you want to use an NSImageView but keep the original image data,  
you'll need to subclass it. I've done this once before. Basically you  
need to override the drag-and-drop methods and handle the drag  
yourself. At the end of the drag you convert the data into an NSImage  
and put that into the view, but you hang onto the data itself in the  
form of an NSData* instance variable. You can then write that data  
into the CoreData store.


—Jens



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Mysterious Redo crash

I'm getting a crash sometimes when performing a Redo. Stack trace is  
below - seems as if it's something internal to the Undo Manager  
putting together the invocation. Any thoughts on how I can investigate  
this further? The Undos and Redos up until this point work fine as far  
as I can see.



#0  0x9358f6e8 in objc_msgSend
#1  0x92351306 in CFRetain
#2  0x922e15c4 in _CFArrayReplaceValues
#3  0x913299a3 in -[NSCFArray insertObject:atIndex:]
#4  0x91329914 in -[NSCFArray addObject:]
#5  0x923cd729 in __NSI3
#6  0x923ce2b5 in -[NSInvocation setArgument:atIndex:]
#7  0x923ce526 in -[NSInvocation invokeWithTarget:]
#8  0x91400e7c in -[_NSUndoInvocation invoke]
#9  0x91400be4 in -[_NSUndoStack popAndInvoke]
#10 0x914cbf07 in -[NSUndoManager redo]
#11 0x00230272 in -[DKUndoManager redo] at DKUndoManager.m:189
#12 0x90435c23 in -[NSApplication sendAction:to:from:]
#13 0x904e4660 in -[NSMenu performActionForItemAtIndex:]


tia,


Graham
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Re: SplashScreen issues

2008-06-20 Thread Jens Alfke



On 20 Jun '08, at 4:13 PM, Damien Cooke wrote:

When creating a splash screen what condition do you use to decide  
when to close your splash screen?  Is there some obvious event that  
is triggered that I can use?


Your app delegate's -applicationDidFinishLaunching: method is probably  
the best place. That's the final callback you're going to get from  
NSApplication during the launch process; it happens after any  
documents/URLs are opened.



do I use [window orderOut:self] to close it? Or is there a better way?


That's how you close a window.

That said, I think splash screens are largely unnecessary. Often the  
presence of a splash screen is a sign that the app launches too  
slowly. Notice that Photoshop Elements 6 has a splash screen, which  
stays up for about 30 seconds while it launches, and helpfully shows  
the names of all the things it's loading. By comparison, Pixelmator  
comes up in about three seconds on my machine, without showing a  
splash screen. Guess which app I'm more likely to use?


—Jens

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Re: Mysterious Redo crash

2008-06-20 Thread Ken Thomases


On Jun 20, 2008, at 6:27 PM, Graham Cox wrote:

I'm getting a crash sometimes when performing a Redo. Stack trace is  
below - seems as if it's something internal to the Undo Manager  
putting together the invocation. Any thoughts on how I can  
investigate this further? The Undos and Redos up until this point  
work fine as far as I can see.



#0  0x9358f6e8 in objc_msgSend
#1  0x92351306 in CFRetain
#2  0x922e15c4 in _CFArrayReplaceValues
#3  0x913299a3 in -[NSCFArray insertObject:atIndex:]
#4  0x91329914 in -[NSCFArray addObject:]
#5  0x923cd729 in __NSI3
#6  0x923ce2b5 in -[NSInvocation setArgument:atIndex:]
#7  0x923ce526 in -[NSInvocation invokeWithTarget:]
#8  0x91400e7c in -[_NSUndoInvocation invoke]
#9  0x91400be4 in -[_NSUndoStack popAndInvoke]
#10 0x914cbf07 in -[NSUndoManager redo]
#11 0x00230272 in -[DKUndoManager redo] at DKUndoManager.m:189
#12 0x90435c23 in -[NSApplication sendAction:to:from:]
#13 0x904e4660 in -[NSMenu performActionForItemAtIndex:]


Looks to me like a memory management bug.  Inside of NSInvocation,  
it's trying to deal with an object of yours that has since been  
deallocated.  It's memory has probably since been used for something  
else, and when objc_msgSend tries to access its innards, it gets sent  
off to la-la-land.


I suspect that NSZombieEnabled will actually mask this crash, but you  
might discover the zombie later.


Another approach is to use MallocStackLoggingNoCompact.  Then, when it  
crashes, sniff the stack a bit to determine which address is being  
treated like an object when it isn't, and use malloc_history to see  
what object has been there in the past.


On x86, you can find the address using:

(gdb) frame 4
(gdb) p *(id*)($ebp+16)


Cheers,
Ken

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Re: Bindings: NSTreeController sends redundant selection keypath KVO notifications

2008-06-20 Thread Hamish Allan

On Fri, Jun 20, 2008 at 1:00 PM, Milen Dzhumerov [EMAIL PROTECTED] wrote:

 I'm building a 3-pane interface and I have a NSTreeController managing the
 sidebar. My actual content displayed in the main view is bound to the
 selection of the tree controller. When I insert a new object into the tree
 controller (I've disabled selection of inserted objects), I can see the new
 object added and the controller also preserves the selection visually. But
 it actually sends a KVO that selection changed - but it has not (even
 logging the selection object returns the same _NSControllerObjectProxy
 instance).

I think that NSTreeController (and NSArrayController and
NSObjectController) send a notification for pretty much everything
that can change any time anything changes... and rely their observers
to actually work out if anything really did change. And even more
annoyingly, the proper change dictionaries are not included with these
notifications.

 The problem is that when selection changes, my main view
 interpolates / animates it's new state - so it fades-in and fades-out
 without changing its appearance. Is there a way to tell the controller not
 to send KVO notifications when the selection has not actually changed?
 Otherwise I would have to keep a flag in the main view whether any changes
 are real or just redundant.

I'm afraid that's about the size of it. Note that in Leopard, you can
register for NSKeyValueObservingOptionPrior which makes this easier
(you'd want to observe selectionIndexPath or something because, as you
noted, the selection object is just a proxy that never changes).

Hamish
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Re: Linking with OpenSSL [Resolved]

2008-06-20 Thread Alexander Hartner


Thanks, this worked like a charm.

On 21 Jun 2008, at 00:02, Trygve Inda wrote:


Thanks for your quick response. Sorry to ask such a stupid question,
but how do I add those. As frameworks?

Alex
On 20 Jun 2008, at 21:45, Trygve Inda wrote:




It seems to me that the linker can't find the OpenSSL libraries. I
already added the Security Framework to my application, this did  
not

make any difference.

Any suggestion what I need to configure to get this to compile.

Thanks in advance
Alex


Try adding these to the project:

/usr/lib/libssl.dylib

And possibly

/usr/lib/libcrypto.dylib


Yes. From the Project menu, choose Add to Project then in the nav  
box,
type / which will let you type in the /usr/lib and press return.  
Then scroll

down the list to find the lib you want to add.

Cheers,

Trygve




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Instance or Class Methods?

2008-06-20 Thread Brian Norwood


This isn't a question of difference; it's about usage.

In many cases, a class has both a generator class method (one that  
returns an initialized instance of the class), as well as an instance  
method that initializes an existing instance, and the two are  
otherwise identical in usage. For example, NSString. I can call:


NSString *stuff = [NSString stringWithString:otherStuff];

or

NSString *stuff = [[NSString alloc] initWithString:otherStuff];

The question is this: is there an advantage to one over the other, and  
why? If so, is this something I should determine on a case by case  
basis? Is +stringWithString: just a shortcut for +alloc and - 
initWithString:?

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Re: Instance or Class Methods?

2008-06-20 Thread Stephen J. Butler

On Fri, Jun 20, 2008 at 9:11 PM, Brian Norwood [EMAIL PROTECTED] wrote:
 NSString *stuff = [NSString stringWithString:otherStuff];

 or

 NSString *stuff = [[NSString alloc] initWithString:otherStuff];

Those aren't equivalent statements, unless you're running under
garbage collection.

 The question is this: is there an advantage to one over the other, and why?
 If so, is this something I should determine on a case by case basis? Is
 +stringWithString: just a shortcut for +alloc and -initWithString:?

It's a shortcut for [[[NSString alloc] initWithString:aString] autorelease].
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Re: Save animation to QuickTime movie?

2008-06-20 Thread Yung-Luen Lan

Hi Rick,

Thanks, it's a good suggestion, but not my case.
The problem is, I have to batch convert thousands of slideshows.
The text information is not just subtitle, I have to highlight
different portion of text depend on time.
For example, text in parenthesis need to be highlighted:

00:13 (AA)AA  
00:15 (AAA)A  
00:16 ( B)BBB 

I don't think iMove or QT text track could do this.

Regards,
yllan

On Sat, Jun 21, 2008 at 5:44 AM, Rick Sustek [EMAIL PROTECTED] wrote:
 Depending on exactly what you have in mind, you may be better served by not
 doing programming at all.
 For example, use iPhoto or iMovie, or a billion other products to produce
 the basic slide show image track into a QT mov file.
 Then add the text overlays via another step with another tool, such as
 titling within iMovie, or text tracks in QT Player Pro, or

 Just a suggestion!
 -Rick


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getting the selected object from an NSTableView causes problems

2008-06-20 Thread Daniel Richman


Hi All,

I've got an NSTableView that displays the data in an NSMutableArray. 
(The program is a to-do list.) I just tried adding a function to allow 
you to delete an item: you select the item in the table and then click 
delete. My code is as follows:


- (IBAction)deleteItem:(id)sender
{
   int selectedRow = [((NSNumber *)[tableView selectedRow]) intValue];
   NSLog(@Selected row is %d, selectedRow);
  
   if (selectedRow != -1) {

   NSLog(@Deleting '%@', [toDoList objectAtIndex:selectedRow]);
   [toDoList removeObjectAtIndex:selectedRow];
   [tableView reloadData];
   }
}

The problem is that if I try to delete any item other than the very 
first one (index 0), the program crashes. I did some log work, which 
revealed that the first line is causing problems (int selectedRow...). 
But that doesn't explain why the deleting the first item works ok. I'm 
stumped. Any ideas?


My project is online at 
http://danielrichman.com/tmp/DataSourceChallence_ToDoList.zip .


Thanks,
--Daniel
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Re: getting the selected object from an NSTableView causes problems


I ran into a very similar problem just today.

There is an error in your code though, unrelated to my problem, but is  
probably yours:



int selectedRow = [((NSNumber *)[tableView selectedRow]) intValue];



-selectedRow simply returns an int, so all that casting to an  
NSNumber* and fetching its -intValue is bogus. You want:


int selectedRow = [tableView selectedRow];

(Aside: I think the addition in Leopard of the NSInteger data type is  
confusing a lot of people - it's just a typedef for 'int', it's not an  
object, and definitely not an NSNumber. But I've seen a few errors  
confusing the two lately that didn't seem to happen before).


hth,


Graham




On 21 Jun 2008, at 12:51 pm, Daniel Richman wrote:

I've got an NSTableView that displays the data in an NSMutableArray.  
(The program is a to-do list.) I just tried adding a function to  
allow you to delete an item: you select the item in the table and  
then click delete. My code is as follows:


- (IBAction)deleteItem:(id)sender
{
  int selectedRow = [((NSNumber *)[tableView selectedRow]) intValue];
  NSLog(@Selected row is %d, selectedRow);
if (selectedRow != -1) {
  NSLog(@Deleting '%@', [toDoList objectAtIndex:selectedRow]);
  [toDoList removeObjectAtIndex:selectedRow];
  [tableView reloadData];
  }
}

The problem is that if I try to delete any item other than the very  
first one (index 0), the program crashes. I did some log work, which  
revealed that the first line is causing problems (int  
selectedRow...). But that doesn't explain why the deleting the first  
item works ok. I'm stumped. Any ideas?


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Fundamental mistake in my understanding of use of classes/instances/encapsulation/messaging


Hi everyone,

If possible, could someone please educate me on the fundamental  
mistake in my understanding of use of classes/instances/encapsulation/ 
messaging. I have reread the Object-Oriented Programming with  
Objective-C but didn't find my answer.
I have written a test program with three classes- Model, View and  
Controller and a Window with a button and a popup button. There are  
setters and getters to test getting data in/out of the Model Class,  
which works as expected. Both the Controller and View Classes are  
connected to the popup button in IB. What I want to do is have the  
View Class to return the value of the selected index of the popup  
button, but all I ever get is 0. I get the value OK from the  
Controller Class though. I am obviously doing something fundamentally  
wrong or misunderstanding something.

Here is the program:

ftp://[EMAIL PROTECTED]:21/xcode/TestCase.zip

The console output I get is as such:
[Session started at 2008-06-20 22:39:25 +1000.]
2008-06-20 22:39:25.780 TestCase[1439:10b] AwakeFromNib called
2008-06-20 22:39:25.784 TestCase[1439:10b] AwakeFromNib called
2008-06-20 22:39:25.784 TestCase[1439:10b] AwakeFromNib dataString is:  
Initial Value


// Select the second item from the popup button and press the button

2008-06-20 22:40:12.004 TestCase[1439:10b] dataString is: Initial Value
2008-06-20 22:40:12.005 TestCase[1439:10b] dataString is:
2008-06-20 22:40:12.006 TestCase[1439:10b] dataString is: TESTING...
2008-06-20 22:40:12.007 TestCase[1439:10b] popUpButtonSelectedIndex  
called and index of selected item is 0

2008-06-20 22:40:12.007 TestCase[1439:10b] View selected index is: 0
2008-06-20 22:40:12.008 TestCase[1439:10b] Controller selected index  
is: 1


Any help would be greatly appreciated.

Jason

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Bindings on Custom View (Initial Value)

2008-06-20 Thread Stefan Arentz



With help from mmalc's binding examples I pretty much got the bindings  
on my custom view working.


I uploaded the app to:

 http://kip.sateh.com/BindableGradientViewWithObjectController/
 http://kip.sateh.com/BindableGradientViewWithObjectController.zip

(First link is source, second is an archive that contains source 
+project+compiled app)


It's a pretty basic example .. there is a GradientView that takes two  
bindings, startingColor and endingColor. These are set with two Color  
Wells and everything is connected with an NSObjectController. Click a  
color well and select a color to see the gradient change.


The only thing that I am not sure about is that I need to have the  
following in my GradientView's bind: method:


- (void) bind: (NSString*) name toObject: (id) object withKeyPath:  
(NSString*) path

options: (NSDictionary*) options
{
// ... do the binding ...

// ??? Without this setValue the initial values are not  
passed to the view

[self setValue: [object valueForKeyPath: path] forKey: name];

// Refresh the view
[self setNeedsDisplay: YES];
}

The binding examples from mmalc are not doing the setValue but without  
it my view keeps it's default colors instead of the colors that I am  
explicitely setting in my controller. The Color Wells are picking up  
this color.


I'm binding the GradientView with:

- (void) awakeFromNib
{
[gradientView bind: @startingColor toObject: objectController  
withKeyPath: @selection.startingColor options:
[NSDictionary dictionaryWithObject: [NSNumber  
numberWithBool:YES]

forKey: @NSContinuouslyUpdatesValue]];  

[gradientView bind: @endingColor toObject: objectController  
withKeyPath: @selection.endingColor options:
[NSDictionary dictionaryWithObject: [NSNumber  
numberWithBool:YES]

forKey: @NSContinuouslyUpdatesValue]];  
}

Is there maybe an option that I need to set to force an initial update?

 S.

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Re: Fundamental mistake in my understanding of use of classes/instances/encapsulation/messaging

Downloading your file produces an empty (zero bytes) file at least  
when clicking your link and using Finder.


But one observation, in an MVC model with a pop-up button, the pop-up  
button *is* the view, so I'm not sure in what way you have connected  
this additional view - that sounds wrong.


Graham


On 20 Jun 2008, at 10:48 pm, Jason Wiggins wrote:

 Both the Controller and View Classes are connected to the popup  
button in IB.

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Re: Fundamental mistake in my understanding of use of classes/instances/encapsulation/messaging

2008-06-20 Thread Henry McGilton (Starbase)



On Jun 20, 2008, at 5:48 AM, Jason Wiggins wrote:


Hi everyone,

If possible, could someone please educate me on the fundamental  
mistake in my understanding of use of classes/instances/ 
encapsulation/messaging. I have reread the Object-Oriented  
Programming with Objective-C but didn't find my answer.
I have written a test program with three classes- Model, View and  
Controller and a Window with a button and a popup button. There are  
setters and getters to test getting data in/out of the Model Class,  
which works as expected.


Okay, so you have a model, and you have a Controller, and you have a  
View.

Where is this View ?Is it a sub-view of the window's content view ?

Both the Controller and View Classes are connected to the popup  
button in IB.


Connected in what way ?Do you have a connection *from* the  
Controller and
*from* the View to the popup button ?If so, why ?What do you  
expect to

happen ?And what is the other button expected to do ?

Sounds like the connections are going in the wrong direction.

Let's ask the fundamental question: when the popup button changes  
state, what do

you want to happen inside the program ?

If I were doing something like this, I would expect that the popup  
button
changing state would send an action message to the controller to tell  
the controller

there's been a change.

The controller would then tell the model to update its state, and  
finally, the
controller would send the new state to the view and possibly tell the  
view to

re-display itself.

What I want to do is have the View Class to return the value of the  
selected index of the popup button, but all I ever get is 0. I get  
the value OK from the Controller Class though. I am obviously doing  
something fundamentally wrong or misunderstanding something.

Here is the program:

ftp://[EMAIL PROTECTED]:21/xcode/TestCase.zip


That  .zip  file is a zero-length file . . .

The log below is not too helpful because it doesn't indicate which  
object is

generating the log.


The console output I get is as such:
[Session started at 2008-06-20 22:39:25 +1000.]
2008-06-20 22:39:25.780 TestCase[1439:10b] AwakeFromNib called
2008-06-20 22:39:25.784 TestCase[1439:10b] AwakeFromNib called
2008-06-20 22:39:25.784 TestCase[1439:10b] AwakeFromNib dataString  
is: Initial Value


// Select the second item from the popup button and press the button

2008-06-20 22:40:12.004 TestCase[1439:10b] dataString is: Initial  
Value

2008-06-20 22:40:12.005 TestCase[1439:10b] dataString is:
2008-06-20 22:40:12.006 TestCase[1439:10b] dataString is: TESTING...
2008-06-20 22:40:12.007 TestCase[1439:10b] popUpButtonSelectedIndex  
called and index of selected item is 0

2008-06-20 22:40:12.007 TestCase[1439:10b] View selected index is: 0
2008-06-20 22:40:12.008 TestCase[1439:10b] Controller selected  
index is: 1



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Re: Fundamental mistake in my understanding of use of classes/instances/encapsulation/messaging

Thanks Henry for your response. I'll have to read that a couple times  
to let it sink into my thick skull. Not sure why the DL link is zero  
length. Here is a better link: http://members.optusnet.com.au/jwiggins/xcode/TestCase.zip
The reason I connected things in the way I did was to understand what  
was and wasn't happening. But then again, as stated, I'm doing  
something fundamentally wrong.


Regards,
Jason


On 21/06/2008, at 2:35 PM, Henry McGilton (Starbase) wrote:



On Jun 20, 2008, at 5:48 AM, Jason Wiggins wrote:


Hi everyone,

If possible, could someone please educate me on the fundamental  
mistake in my understanding of use of classes/instances/ 
encapsulation/messaging. I have reread the Object-Oriented  
Programming with Objective-C but didn't find my answer.
I have written a test program with three classes- Model, View and  
Controller and a Window with a button and a popup button. There are  
setters and getters to test getting data in/out of the Model Class,  
which works as expected.


Okay, so you have a model, and you have a Controller, and you have a  
View.
Where is this View ?Is it a sub-view of the window's content  
view ?


Both the Controller and View Classes are connected to the popup  
button in IB.


Connected in what way ?Do you have a connection *from* the  
Controller and
*from* the View to the popup button ?If so, why ?What do you  
expect to

happen ?And what is the other button expected to do ?

Sounds like the connections are going in the wrong direction.

Let's ask the fundamental question: when the popup button changes  
state, what do

you want to happen inside the program ?

If I were doing something like this, I would expect that the popup  
button
changing state would send an action message to the controller to  
tell the controller

there's been a change.

The controller would then tell the model to update its state, and  
finally, the
controller would send the new state to the view and possibly tell  
the view to

re-display itself.

What I want to do is have the View Class to return the value of the  
selected index of the popup button, but all I ever get is 0. I get  
the value OK from the Controller Class though. I am obviously doing  
something fundamentally wrong or misunderstanding something.

Here is the program:

ftp://[EMAIL PROTECTED]:21/xcode/TestCase.zip


That  .zip  file is a zero-length file . . .


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Re: Fundamental mistake in my understanding of use of classes/instances/encapsulation/messaging


Graham,

You observation is helpful. I thought that I needed to create a view  
class. I also thought that with this view class it would have an  
IBAction (the popup button connected to this) with a switch function,  
with each case setting an ivar which would be returned to the  
controller class through getter in the controller when the button was  
pressed. I you get what I mean. Am I going the long way round by  
doing this?

So have I gone too far with the idea of abstraction?
By your observation, I should lose the view class I created and  
connect an IBAction in the controller to the popup button?


Regards,
Jason


On 21/06/2008, at 2:05 PM, Graham Cox wrote:

Downloading your file produces an empty (zero bytes) file at least  
when clicking your link and using Finder.


But one observation, in an MVC model with a pop-up button, the pop- 
up button *is* the view, so I'm not sure in what way you have  
connected this additional view - that sounds wrong.


Graham


On 20 Jun 2008, at 10:48 pm, Jason Wiggins wrote:

Both the Controller and View Classes are connected to the popup  
button in IB.


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Re: Fundamental mistake in my understanding of use of classes/instances/encapsulation/messaging



On 21 Jun 2008, at 2:56 pm, Jason Wiggins wrote:


http://members.optusnet.com.au/jwiggins/xcode/TestCase.zip



OK, it's downloading now. However, it's an Xcode 3.1 project which  
isn't compatible with Xcode 3. If you want help, you need to help *us*  
to help you. Set the project to be Xcode 2.4 compatible.



Graham
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Bindings Concept Question

2008-06-20 Thread Alex Wait

I know this is probably a really basic question about binding but it's sure
tripping me up right now.

I am making my way through Cocoa Programming for Mac OS X by Aaron
Hillegrass. It's an excellent book btw.

However the first time he has discusses binding is in the context of a
NSDocument arch.

I am trying to make an app on my own. On the window I have a TableView with
two columns, two edit fields, and a button.

My desired behavior is for the user to type in both of the fields, click the
add button and poof it appears in the table.
I have done this exercise before but I made my AppController class the
dataSource and provided the methods. I would like to this time use
the NSArrayController to handle it for me.

Right now I have NSArrayController binded to App Controller and the
arrayOfData array. In my init method for Appcontroller,
I add one Data object (which contains two strings) to my NSMutableArray.
This array is the array that my ArrayController is bound to.

When the app starts, I see the data as expected. However, when I call my add
function, which gets the strings from the textFields and makes the
new Data object and adds it to the array, I do not see it in the table.

I tried calling the table's reloadData function but that did not work. (I
bounded it of course and I threw in a check to make sure it's not nill with
a NSLog to prove it to me)

What am I doing wrong?

--Thanks for reading this fairly long winded post. I am greatly enjoying
this new methodology of Cocoa programming. It's very exciting and I am eager
to learn more!

Alex Wait

-- 
If you can't be kind, at least have the decency to be vague.
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Re: Fundamental mistake in my understanding of use of classes/instances/encapsulation/messaging

You observation is helpful. I thought that I needed to create a view  
class. I also thought that with this view class it would have an  
IBAction (the popup button connected to this) with a switch  
function, with each case setting an ivar which would be returned to  
the controller class through getter in the controller when the  
button was pressed. I you get what I mean. Am I going the long way  
round by doing this?

So have I gone too far with the idea of abstraction?
By your observation, I should lose the view class I created and  
connect an IBAction in the controller to the popup button?



Looking at your nib file (which at least I can open), the pop-up  
button is not connected to anything at all, which is probably why it's  
not doing anything.


Also, you have a generic custom object set to View. That's incorrect  
- Views are any specific widget or control (in fact any NSView  
subclass) that you use in IB, so your Button and the Pop-up are  
already views. You don't need to instantiate one as a standalone  
custom object - remove it.


Your pop-up button should send its action to the controller. That's  
where the popUpChoice: method (or whatever) would go. You don't need  
a View object as you have created it. The controller in turn will  
invoke methods on the model to set its state. Generally controllers  
contain lots of glue code which interprets stuff coming from the  
views (controls) and translate that to state changes in the data  
model, and vice versa.


Custom views are often created, but not in the way you've done it.  
Instead you drag a custom view to a window (typically) and set its  
class. However at this stage I don't think you need to know about this.



Graham



On 21 Jun 2008, at 2:56 pm, Jason Wiggins wrote:

Thanks Henry for your response. I'll have to read that a couple  
times to let it sink into my thick skull. Not sure why the DL link  
is zero length. Here is a better link: http://members.optusnet.com.au/jwiggins/xcode/TestCase.zip
The reason I connected things in the way I did was to understand  
what was and wasn't happening. But then again, as stated, I'm doing  
something fundamentally wrong.



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Re: Fundamental mistake in my understanding of use of classes/instances/encapsulation/messaging