C / C++ / MFC

LPHWAVEIN phWaveIn = NULL;
WAVEFORMATEX pcmWaveFormat;

::memset(&pcmWaveFormat, 0, sizeof(WAVEFORMATEX));

pcmWaveFormat.wFormatTag = WAVE_FORMAT_PCM;
pcmWaveFormat.nChannels = 1;
pcmWaveFormat.nSamplesPerSec = 11025L;
pcmWaveFormat.nAvgBytesPerSec = 11025L;
pcmWaveFormat.nBlockAlign = 1;
pcmWaveFormat.wBitsPerSample = 8;
//pcmWaveFormat.cbSize = 0;

MMRESULT rResult;
rResult = IsFormatSupported(&pcmWaveFormat, WAVE_MAPPER);
if(rResult != MMSYSERR_NOERROR) return;

rResult = ::waveInOpen(phWaveIn, WAVE_MAPPER, &pcmWaveFormat, 0, 0, CALLBACK_NULL);
if(rResult != MMSYSERR_NOERROR)
{
    CString sErrorMsg;

    if(rResult == MMSYSERR_ALLOCATED)
        sErrorMsg = "Specified resource is already allocated.";
    else if(rResult == MMSYSERR_BADDEVICEID)
        sErrorMsg = "Specified device identifier is out of range.";
    else if(rResult == MMSYSERR_NODRIVER)
        sErrorMsg = "No device driver is present.";
    else if(rResult == MMSYSERR_NOMEM)
        sErrorMsg = "Unable to allocate or lock memory.";
    else if(rResult == WAVERR_BADFORMAT)
        sErrorMsg = "Attempted to open with an unsupported waveform-audio format.";

}