Path: utzoo!utgpu!news-server.csri.toronto.edu!csri.toronto.edu!halpern
Newsgroups: comp.sys.mac.programmer
From: halpern@csri.toronto.edu (Charles Halpern)
Subject: Sound manager problem
Message-ID: <1990Mar18.195207.26065@jarvis.csri.toronto.edu>
Distribution: net
Date: 19 Mar 90 00:52:07 GMT
Lines: 41

*** REPLACE THIS LINE WITH YOUR MESSAGE ***
The following Think C 3.02 bombs on a Mac SE with no inits.
I commucicated the code over the phone to someone using a Mac II,
and again it bombed.  Usually, though not always, the bomb occurs
with the second SndNewChannel call.  Variously, the problem is a 
bus error, odd address, illegal instruction, or the computer hangs.
It even happens without the Multifinder or the Debugger.  

osErr is never set to anything but noErr.

I presume that I am not understanding something.  I am using IM 5, 
I haven't got the relevant tech notes.  The code:

#include <SoundMgr.h>

void			main ()
{
OSErr 			osErr;
SndChannelPtr	channelP;

	channelP	= 0L;	

	osErr 		= SndNewChannel (&channelP, sampledSynth, 0L, 0L);

	osErr 		= SndDisposeChannel (channelP, TRUE);

	channelP	= 0L;	

	osErr 		= SndNewChannel (&channelP, sampledSynth, 0L, 0L);
}


That's the whole thing.  (My problems started in a complete program, but
I've shrunk it down to this with the same error.)  Variations have included
skipping the SndDisposeChannel, checking with availableCmd, varying the
synthesizer asked for, etc.  

Thanks,

Charlie Halpern
halpern@toronto.edu