There's a bug in NSDocument in that it doesn't protect itself against nil return values from -fileNameExtensionForType:saveOperation:. To work around, make sure you return a non-nil value from that method.
-KP On Sep 20, 2011, at 2:49 AM, Gerriet M. Denkmann wrote: > In my toy editor I open an existing document, modify it and click "Duplicate". > > A Sheet comes down and tells me that the duplicate will contain my latest > modifications. > I click the default "Duplicate" button and get: > > 2011-09-20 16:29:43.164 TextEditor[4062:707] *** -[NSPathStore2 > stringByAppendingPathExtension:]: nil argument > 2011-09-20 16:29:43.213 TextEditor[4062:707] ( > 0 CoreFoundation 0x00007fff8742a986 > __exceptionPreprocess + 198 > 1 libobjc.A.dylib 0x00007fff80f84d5e > objc_exception_throw + 43 > 2 CoreFoundation 0x00007fff8742a7ba > +[NSException raise:format:arguments:] + 106 > 3 CoreFoundation 0x00007fff8742a744 > +[NSException raise:format:] + 116 > 4 Foundation 0x00007fff89d8a172 > -[NSPathStore2 stringByAppendingPathExtension:] + 112 > 5 AppKit 0x00007fff845808c3 -[NSDocument > _preserveCurrentVersionForReason:error:] + 579 > 6 AppKit 0x00007fff84586bc3 > __-[NSDocument > duplicateDocumentWithDelegate:didDuplicateSelector:contextInfo:]_block_invoke_3 > + 119 > 7 AppKit 0x00007fff845819a9 -[NSDocument > _something:wasPresentedWithResult:soContinue:] + 21 > 8 AppKit 0x00007fff84472bee -[NSAlert > didEndAlert:returnCode:contextInfo:] + 93 > 9 AppKit 0x00007fff8447f356 > -[NSApplication endSheet:returnCode:] + 275 > 10 AppKit 0x00007fff84472ab4 -[NSAlert > buttonPressed:] + 265 > 11 CoreFoundation 0x00007fff8741a11d -[NSObject > performSelector:withObject:] + 61 > 12 AppKit 0x00007fff842ce852 > -[NSApplication sendAction:to:from:] + 139 > 13 AppKit 0x00007fff842ce784 -[NSControl > sendAction:to:] + 88 > 14 AppKit 0x00007fff842ce6af -[NSCell > _sendActionFrom:] + 137 > 15 AppKit 0x00007fff844d758a > -[NSButtonCell performClick:] + 594 > 16 AppKit 0x00007fff84337afd -[NSButton > performKeyEquivalent:] + 368 > 17 AppKit 0x00007fff84337722 -[NSView > _performKeyEquivalent:conditionally:] + 45 > 18 AppKit 0x00007fff8433796d -[NSControl > _performKeyEquivalent:conditionally:] + 119 > 19 AppKit 0x00007fff84337850 -[NSView > performKeyEquivalent:] + 155 > 20 AppKit 0x00007fff84473d06 > -[_NSAlertContentView performKeyEquivalent:] + 92 > 21 AppKit 0x00007fff84337722 -[NSView > _performKeyEquivalent:conditionally:] + 45 > 22 AppKit 0x00007fff84337850 -[NSView > performKeyEquivalent:] + 155 > 23 AppKit 0x00007fff84337722 -[NSView > _performKeyEquivalent:conditionally:] + 45 > 24 AppKit 0x00007fff84337695 -[NSWindow > performKeyEquivalent:] + 58 > 25 AppKit 0x00007fff8485caeb -[NSWindow > keyDown:] + 74 > 26 AppKit 0x00007fff84297ad2 -[NSWindow > sendEvent:] + 7404 > 27 AppKit 0x00007fff8422ff19 > -[NSApplication sendEvent:] + 5665 > 28 AppKit 0x00007fff841c642b > -[NSApplication run] + 548 > 29 AppKit 0x00007fff8444452a > NSApplicationMain + 867 > 30 TextEditor 0x0000000100001bc0 main + 32 > 31 TextEditor 0x0000000100001b94 start + 52 > 32 ??? 0x0000000000000001 0x0 + 1 > ) > > TextEdit can duplicate a modified document without any problems. > > So obviously my program does something not quite right. > But as there is hardly any of my own code in this backtrace, how can I debug > this? > > > Kind regards, > > Gerriet. > > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/cocoa-dev/kperry%40apple.com > > This email sent to kpe...@apple.com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
