Question on waveOutOpen()

What would cause this to return a code of MMSYSERR_INVALFLAG(10)? I'm at a loss on how to troubleshoot this.

Which API? openAL?

Originally Posted by Ed Mack

Which API? openAL?

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waveOutOpen() imported from winmm.dll.

Well, it's yelling about an invalid flag, so the obvious question is...what are you passing in for the flags parameter?

I'm passing in 0x00030000 as the last parameter, which is CALLBACK_FUNCTION.

Make sure the dwCallback parameter is the address of a function with the proper prototype. The callback function must also be declared with the CALLBACK calling convention.

Also try adding WAVE_ALLOWSYNC to the flags, just to see if this makes it work.

Originally Posted by Reedbeta

Make sure the dwCallback parameter is the address of a function with the proper prototype. The callback function must also be declared with the CALLBACK calling convention.

Also try adding WAVE_ALLOWSYNC to the flags, just to see if this makes it work.

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Ok, I tried that, but I'm getting the same return code. The thing is, I don't really think the flag is where the problem is. I can call waveOutOpen() with a format(3rd parameter) of PCM, and everything would be fine. But if I change the format to GSM610 and leave all the other parameters the same, I get an invalid flag return code. I don't think its the callback function either, since it works if I set the format to PCM.

Hmm...I don't know much of anything about the GSM codec. Possibly it's not supported by the wavOut functions, but needs a third-party library to decode?

Originally Posted by Reedbeta

Hmm...I don't know much of anything about the GSM codec. Possibly it's not supported by the wavOut functions, but needs a third-party library to decode?

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I believe its supported as long as you have the codec. I know its supported because I have source code in C++ that uses it, and when I compile it, it works using the GSM610 format. But I'm trying to convert it to C#, and that's where I'm getting stuck on because I'm getting an error code of 10 back when trying to use waveOutOpen().