Re: Getting an AudioDeviceID from device unique identifier (UID)
Re: Getting an AudioDeviceID from device unique identifier (UID)
- Subject: Re: Getting an AudioDeviceID from device unique identifier (UID)
- From: Jeff Moore <email@hidden>
- Date: Wed, 23 Apr 2003 11:18:31 -0700
How could AudioHardwareGetProperty() return an error? You passed an
address, just not an address that pointed to a valid CFStringRef. There
really isn't a way to validate a random address like that. The best it
can do is check to see if you passed NULL.
I imagine that what you were doing was corrupting your heap, thus
setting up the conditions for a very hard to track down random crash
bug.
On Wednesday, April 23, 2003, at 09:53 AM, Sean McBride wrote:
Brad Ford (email@hidden) wrote on Wed, 23 Apr 2003 09:26:13 -0700:
I tried this:
AudioDeviceID myDevice;
AudioValueTranslation trans;
trans.mInputData = (void*)CFSTR ("AppleDBDMAAudioEngine:0");
There's your problem. You need to pass a POINTER to a CFStringRef.
Like this:
CFStringRef myKnownUID = CFSTR("AppleDBDMAAudioEngine:0");
trans.mInputData = &myKnownUID;
Thanks Brad! I should have been more suspicious of the need to cast.
Shouldn't AudioHardwareGetProperty() have returned me an error though?
Perhaps I'm lucky it didn't crash. :)
Thanks!
--
____________________________________________________________
Sean McBride, B. Eng email@hidden
Mac Software Designer +1-514-822-6000
Matrox Electronic Systems Ltd. Montrial, Quibec, Canada
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--
Jeff Moore
Core Audio
Apple
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