Ah, of course - silly me. Working on assumptions instead of using my eyes.
So the relevant code is this:
NSMapInsertKnownAbsent(windowsForSheets, sheet, docWindow);
and seeing as windowForSheets is created with:
windowsForSheets = NSCreateMapTable(NSObjectMapKeyCallBacks,
NSObjectMapValueCallBacks, 0);
and NSObjectMapKeyCallBacks has a nil notAKeyMarker…
So if the sheet is nil, then an exception is raised. Not sure how that would be
possible in my code, but at least I now understand what is going on.
Regards
Gideon
On 06/03/2012, at 10:42 AM, Mike Abdullah wrote:
> -[OAApplication
> beginSheet:modalForWindow:modalDelegate:didEndSelector:contextInfo:]
>
> That's definitely not part of Cocoa! You have the source. Dig in to find the
> problem.
>
> On 5 Mar 2012, at 15:15, Gideon King wrote:
>
>> Hi, I am getting occasional reports of an exception from users of my
>> software, but they are not able to reproduce it, and nor am I.
>>
>> I have a sheet which has an NSCollectionView on it and a couple of buttons
>> and a slider. The NIB also instantiates an array controller which is used as
>> the content for the collection view.
>>
>> This is the exception I get:
>>
>> *** NSMapInsertKnownAbsent(): attempt to insert notAKeyMarker
>>
>> 0 CoreFoundation 0x00007fff896a9fc6 __exceptionPreprocess + 198
>> 1 libobjc.A.dylib 0x00007fff855ced5e objc_exception_throw + 43
>> 2 CoreFoundation 0x00007fff896a9dfa +[NSException raise:format:arguments:] +
>> 106
>> 3 CoreFoundation 0x00007fff896a9d84 +[NSException raise:format:] + 116
>> 4 Foundation 0x00007fff890f67bc -[NSClassicMapTable
>> setItem:forKnownAbsentKey:] + 74
>> 5 OmniAppKit 0x000000010051f008 -[OAApplication
>> beginSheet:modalForWindow:modalDelegate:didEndSelector:contextInfo:] + 184
>>
>> I do not instantiate an NSClassicMapTable explicitly in my code, but am
>> assuming that either the array controller or the collection view uses such
>> things.
>>
>> I have never been able to reproduce the problem myself, either in a test
>> environment or anywhere else either on 10/6 or 10.7 (users have reported it
>> on both operating system versions).
>>
>> If anyone has any suggestions as to where to look for this, I'd be very
>> grateful.
>>
>>
>> Regards
>>
>> Gideon
>>
>>
>>
>>
>>
>>
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