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trying to capture doc info at close/quit time

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trying to capture doc info at close/quit time

Subject: trying to capture doc info at close/quit time
From: Ken Victor <email@hidden>
Date: Wed, 17 Aug 2005 12:10:19 -0700

I'm attempting to catch the "closed" status of changed documents at quit time in my (core data) document based cocoa app.

I have a [mydoc canCloseDocumentWithDelegate:shouldCloseSelector:contextInfo:] method in my document class and when I call this (passing in my own shouldCloseSelector) when I close the document via a "close document" menu item or when the last window closes, my shouldCloseSelector is properly called and does what I want.

However, at quit time [mydoc canCloseDocumentWithDelegate: shouldCloseSelector:contextInfo:] is called from the shared NSDocumentController and it is passed a selector to a private method (_closeDocumentsStartingWith:shouldClose:closeAllContext:) thus my shouldCloseSelector is not called. So i modified my canCloseDocumentWithDelegate:shouldCloseSelector:contextInfo: method such that if it is called at quit time with a delegate that isKindOfClass: [NSDocumentController class], I save the passed in delegate, shouldCloseSelector, and contextInfo and replace them with myself as delegate, my shouldCloseSelector, and an appropriate contextInfo. Then in my shouldCloseSelector, after I've captured the info I want, I create a NSInvocation object using the saved values and invoke it. Note that the calls to create an NSMethodSignature and a NSInvocation succeed and look correct. Additionally, i check that the saved delegate responds to the saved selector. However, my invocation fails with a:

*** -[nsdocumentcontroller methodsignatureforselector:]: null selector

When I set a breakpoint at NSLog to catch the write to the console, I get the following stack trace:

#0 0x928897ac in -[NSObject methodSignatureForSelector:] () #1 0x92870ca4 in -[NSObject(NSForwardInvocation) forward::] () #2 0x909b20d0 in _objc_msgForward () #3 0x909b2214 in objc_msgSendv () #4 0x92878a28 in -[NSInvocation invoke] () #5 0x92878fd8 in -[NSInvocation invokeWithTarget:] () #6 0x000069a8 in -[myDoc shouldCloseDelegate:shouldClose:contextInfo:] (self=0x348b90, _cmd=0x17184, document=0x348b90, shouldClose=1 '\001', contextInfo=0x348b90) at /Volumes/Disk2/Contracts/MyApp/code/Source/MyDoc:910 #7 0x93960454 in -[NSDocument _closeAlertSheet:wasPresentedWithResult:inContext:] () #8 0x9382e288 in -[NSAlert didEndSheet:returnCode:contextInfo:] () #9 0x938195dc in -[NSAlert buttonPressed:] () #10 0x936cd08c in -[NSApplication sendAction:to:from:] () #11 0x936ccfc0 in -[NSControl sendAction:to:] () #12 0x936ccea0 in -[NSCell _sendActionFrom:] () #13 0x936e6eb8 in -[NSCell trackMouse:inRect:ofView:untilMouseUp:] () #14 0x936e6aa0 in -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] () #15 0x936e64c4 in -[NSControl mouseDown:] () #16 0x93687d28 in -[NSWindow sendEvent:] () #17 0x93630f5c in -[NSApplication sendEvent:] () #18 0x936cf634 in -[NSApplication _shouldTerminate] () #19 0x936cf278 in -[NSApplication terminate:] () #20 0x936cd08c in -[NSApplication sendAction:to:from:] () #21 0x93727888 in -[NSMenu performActionForItemAtIndex:] () #22 0x9372760c in -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] () #23 0x937270b4 in -[NSMenu performKeyEquivalent:] () #24 0x93726d00 in -[NSApplication _handleKeyEquivalent:] () #25 0x93630a90 in -[NSApplication sendEvent:] () #26 0x936283f0 in -[NSApplication run] () #27 0x93718c1c in NSApplicationMain () #28 0x00002874 in main (argc=1, argv=0xbffffa9c) at /Volumes/Disk2/Contracts/MyApp/code/Source/main.m:13

Also, my app's delegate method applicationWillTerminate is not called, but the app does go on to terminate.

So, my questions are as follows:

1) is there a better way to capture the result of closing documents at quite time? and if so, what is it? 2) if what I am doing is not an unreasonable approach, then what is going wrong?

thanx,
ken
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