Re: [Pyobjc-dev] Memory Management Problem - Objects being deallocated

[James R E. <Jam...@lr...>]

Hi Lukas,

Most likely PyObjC is doing the right thing, just not what you  
expect.  I suppose it depends on your definition of the right thing,  
though.  It's hard to say what's happening based on what you've given,  
but it sounds like you might have a case of unretained delegates.

PyObjC will hold an ObjC reference (i.e. retain) any objects on its  
side of the bridge.  Remember that for some Cocoa delegates and data  
providers, you are expected to retain a copy of the data source (e.g.  
NSTableView dataSource).  If you don't make sure you keep a python  
reference to that object, then PyObjC will no longer keep the ObjC  
reference, and the object will be released.  So the first place I'd  
look is to make sure you're keeping a python reference to all your  
dataSource's and other appropriate delegates (the Cocoa documentation  
is your friend here).

Good luck!
James

On 29 sept. 2009, at 18:34, Lukas Pitschl | Dressy Vagabonds wrote:

> At the moment I'm re-implementing the GPGMail Plugin in PyObjC and I
> noticed
> that sometimes the Mail.app crashes because PyObjC is accessing memory
> that
> is no longer allocated.
>
> As the documentation mentions memory management should be left to  
> PyObjC
> I wonder how this can happen.
>
> Should i use retain on the object? Any suggestions how to find the
> objects that are causing the problem
> or debug this situation further?
>
> Greets
>
> Lukas
>
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