Re: [Pyobjc-dev] NSTextView weirdness

[Ronald O. <ous...@ci...>]

Phew, I think I found the problem with NSTextView. I've just checked in 
a fix for this problem, it was caused by me not quite understanding how 
Python does method resolution: Instead of calling __getattr__ on the 
class the implementation directly looks inside the class __dict__. This 
bypasses a hook in the __getattr__ implementation of objc_class that is 
used to detect Objective-C classes whose method-table have been changed 
since the last attribute lookup.

BTW. Don't do 'NSTextView.alloc()', but always add an init* call. If 
you don't do this the program will crash. This is not a PyObjC problem, 
but a Cocoa problem ([[NSTextView alloc] release] causes a segfault).

I've opened bug reports with Apple about this, the [NSTextView alloc] 
problem using an NSInvocation (as described earlier) and the fact that 
NSOutlineView doesn't call retain on model objects even if it store 
references to them.

Ronald

On Wednesday, Nov 13, 2002, at 22:24 Europe/Amsterdam, bb...@ma... 
wrote:

> Is it the case that the class object is being released to the point of 
> death by the NSInvocation (and, subsequently, by the Python wrapper 
> for the ObjC object)?
>
> No... that isn't it... more like NSTextView.alloc() is returning 
> something similar to NSArray.alloc() that behaves in a slightly 
> different and more volatile fashion?
>
> Nuts.
>
> Yes, this was a part of debugging Steve's earlier problem and it still 
> doesn't address that problem.
>
>> If I evaluate NSTextView.setEditable_ before calling obj.setEditable_ 
>> all goes well. I'm still checking why this is necessary.
>
> I have not a clue and will be quite interested in the answer!
>
> b.bum
>
> On Wednesday, November 13, 2002, at 04:16 PM, Ronald Oussoren wrote:
>
>> Some more debugging shows:
>>
>> The test code is too complex, the code below also causes a crash:
>>
>> from AppKit import NSTextView
>> NSTextView.alloc()
>>
>> .....
>
>
>
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