John, I suggest reading:
http://www.corbinstreehouse.com/blog/2007/10/instruments-on-leopard-how-to-debug-those-random-crashes-in-your-cocoa-app/
--corbin
On Feb 2, 2010, at 11:02 AM, John Nairn wrote:
> I copied code from Cocoa documentation to create a custom field editor. It
> gets created OK and seems to work, but always crashes when the the window
> closes with the message
>
> Program received signal: “EXC_BAD_ACCESS”.
> sharedlibrary apply-load-rules all
>
> I created the custom editor in the window controller using code from Apple:
>
> - (id)windowWillReturnFieldEditor:(NSWindow *)sender toObject:(id)anObject
> {
> if([anObject isKindOfClass:[NSTextField class]])
> { if(!customEditor)
> { customEditor=[[BrowserFieldEditor alloc] init];
> [customEditor setFieldEditor:YES];
> }
> return customEditor;
> }
> return nil;
> }
>
> When the window controller is deallocated, it calls
>
> [customEditor dealloc];
>
> Finally, the entire custom editor, which is NSTextView subclass, is
>
> @implementation BrowserFieldEditor
>
> - (id)init
> { if(self=[super init])
> { NSLog(@"init field editor");
> }
> return self;
> }
>
> - (void)dealloc
> { NSLog(@"dealloc field editor");
> [super dealloc];
> }
>
> @end
>
> The "init field editor" message appears when created and the "dealloc field
> editor" appears just before the crash. If I change the window controller to
> not release the custom editor, the crash stops, but the "dealloc field
> editor" message never appears (i.e., a memory leak). Also the Apple
> documentation explicitly says:
>
> The custom field editor should be released in an appropriate place, such as
> the dealloc method of the window delegate object (if the field editor was
> never instantiated, therelease message has no effect and is harmless).
>
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