Re: [Pyobjc-dev] Memory management bug using .new()

[Orestis M. <or...@or...>]

That's interesting, we are seeing similar behaviour to other  
classmethods that do this (eg. CALayer.layer()), but so far I chalked  
it up to our fault. Perhaps it's the same issue?

Orestis



On 18 Jun 2009, at 16:54, Dirk Stoop wrote:

> Hi all,
>
> I don't think anyone ever uses this method – NSObject.new() – anymore,
> but in case someone does: I just ran into a reproducable problem with
> it.
>
> When you create a new cocoa object within an instance method of a
> Cocoa class implemented in Python, normally that fresh object is
> released when the scope dissapears. (that is, when you're not storing
> a reference to it in an attribute that exists outside of the method's
> scope).
>
> e.g.:
>
> class MyAmazingViewController(NSViewController):
>     def animate(self):
>         animation = NSViewAnimation.alloc().init()
>         # insert code to create an array/list of NSDictionaries
> describing the animations
>
> animation.setViewAnimations_(theAboveMentionedHypotheticalArray)
>         animation.setDuration_(5.0)
>         animation.setAnimationBlockingMode_(NSAnimationNonblocking)
>         animation.startAnimation()
>
> ( if the spaces got stripped from my example somehow, snippet also
> pasted here: http://pastie.org/516369 )
>
> After control returns from the "animate" method, and after the
> animation is done, it is automatically released.
>
> However if you replace "NSViewAnimation.alloc().init()", with
> "NSViewAnimation.new()", the animation is not automatically released.
> Consequentially, any views or windows included in the dictionaries
> that form the viewAnimations array are also retained, causing quite a
> significant leak.
>
> Juding from the NSObject class docs, calling "new()" on a class should
> do exactly the same thing as "alloc().init()", but PyObjC doesn't seem
> to treat it the same way.
>
> http://tinyurl.com/nsobject-new
>
> Can anyone enlighten me whether this is a bug, a feature, or simply
> something I'm misunderstanding?
>
> Thanks!
> - Dirk
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