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Re: Warnings and tips for using AUGenericView
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Re: Warnings and tips for using AUGenericView

On Aug 7, 2008, at 3:38 PM, Christopher Ashworth wrote:

4) The viewWillMoveToWindow bug that leads to a crash, originally described here:

http://lists.apple.com/archives/coreaudio-api/2007/Nov/msg00019.html

still exists, so be careful how you manipulate your views. 

Additionally:

This crash occurs when a call to AUGenericView's viewWillMoveToWindow: is given nil for the new window. Attempting to avoid this crash by subclassing AUGenericView does not appear to be possible, because the retain count of the view is modified by AUGenericView's implementation of viewWillMoveToWindow. Basically, the permutations are as follows:

- by default, if you try to remove an AUGenericView from its superview, viewWillMoveToWindow will be called with a nil newWindow and you'll crash

- if you subclass AUGenericView and override viewWillMoveToWindow: to avoid passing it along only when newWindow is nil, the view will work (including updating controls while the AU runs), but the view will never be released.

- if you subclass AUGenericView and override viewWillMoveToWindow: to avoid *ever* passing it along to AUGenericView, the view will basically work and not get leaked, except that the controls in the view will not be updated while the AU runs.

If anyone knows some clever way to make AUGenericView usable I'd love to hear it. Otherwise it appears I'll need to re-implement my own version of it.

Thanks,
Chris

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 >Warnings and tips for using AUGenericView (From: Christopher Ashworth <email@hidden>)























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