waveOutOpen

I am working on codac application in Windows 7. Now somewhere in the middle this application calls this "waveOutOpen" function. But function is generating this MMSYSERR_BADDEVICEID error. In my PC no speaker is attached. The inbuilt speaker is not working. So the volume bar shows cross. But when I attach a headphone in the jack the Cross gets removed from the volumebar, that means that sound drivers are installed. Can someone tell me why this error is coming?

Code:

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mr = waveOutOpen((LPHWAVEOUT)&m_hWaveOut,WAVE_MAPPER,(tWAVEFORMATEX*)&m_wavFmt,0L,0L,0L);

//if(mr != MMSYSERR_NOERROR)
if(mr == MMSYSERR_BADDEVICEID)
{
        LPVOID lpMsgBuf;
        FormatMessage(
                FORMAT_MESSAGE_ALLOCATE_BUFFER |
                FORMAT_MESSAGE_FROM_SYSTEM |
                FORMAT_MESSAGE_IGNORE_INSERTS,
                NULL,
                GetLastError(),
                0, // Default language
                (LPTSTR) &lpMsgBuf,
                0,
                NULL
        );

        MessageBox( NULL, (LPCTSTR)lpMsgBuf, "Error", MB_OK | MB_ICONINFORMATION );
        return FALSE;
        /*AfxMessageBox("Sound device open error !");
        return FALSE;*/
}

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Although it is strange that in GetLastError it says operation completed successfully

Quote:

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Originally Posted by maverick786us

I am working on codac application in Windows 7. Now somewhere in the middle this application calls this "waveOutOpen" function. But function is generating this MMSYSERR_BADDEVICEID error.
...
Although it is strange that in GetLastError it says operation completed successfully

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Where did you read that GetLastError has anything to do with waveOutOpen function? :confused:
It has nothing! :cool:
waveOutOpen itself returns you the error code as it very clear states in the docs:

Quote:

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waveOutOpen
...
Return Values
Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error values include the following.
...

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