Re: Update Cocoa object from callback
Re: Update Cocoa object from callback
- Subject: Re: Update Cocoa object from callback
- From: Jeff Moore <email@hidden>
- Date: Tue, 20 May 2003 14:38:35 -0700
Calling most of Cocoa's API requires doing so within a block guarded by
an autorelease pool. The threads that Cocoa owns itself will arrange
for this to be true. However, you are on your own when you are
executing code on threads not owned by Cocoa, like the CoreAudio
threads.
When I find myself in a situation where I need to call back into Cocoa,
I do one of two things. Either I explicitly create an autorelease pool
around the block of code in question or, more usually, I make use of
-performSelectorOnMainThread:withObject:waitUntilDone: to be sure the
work I'm doing gets done on a known safe-for-Cocoa thread.
On Tuesday, May 20, 2003, at 02:15 PM, Mark's Studio wrote:
How do i notify my Cocoa object with a value from within the callback?
i tried with NSNotification
[[NSNotificationCenter defaultCenter] postNotificationName:@"Update"
object:[NSNumber numberWithUnsignedInt:myValue]]
but i get this in the console
_NSAutoreleaseNoPool(): Object 0x17f7ab0 of class NSCFNumber
autoreleased with no pool in place - just leaking
should i post notification with object:nil and then [myCocoaObject
setValue: myValue];
or what is the proper way to do this?
is AUListenerCreate something that can be used with Cocoa?
I looked at all the fine examples, but C++ is not my friend, so i did
not learn much from them.
Peter Mark
Mark's Recording Studio A/S
Lundeskovsvej 3 2900 Hellerup
Denmark
Tel: +45 35366078 Fax: +45 35366038
www.marks-studio.dk
email@hidden
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--
Jeff Moore
Core Audio
Apple
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