IltmmCapture::IsPreviewTapSupported Example for C++

void GetCaptureVideoWindowHandle(IltmmCapture *pCapture)
{
   VARIANT_BOOL vrtSupported;

   HRESULT hr = pCapture->IsPreviewTapSupported(ltmmCapture_Preview_Audio, ltmmCapture_PreviewTap_Source, &vrtSupported);
   if (SUCCEEDED(hr) && vrtSupported == VARIANT_TRUE)
   {
      VARIANT_BOOL vrtMute;
      long lVol, lBalance;

      // unmute it if currently muted
      pCapture->get_Mute(&vrtMute);
      if (vrtMute == VARIANT_TRUE)
         pCapture->put_Mute(VARIANT_FALSE);
      
      // adjust the volume
      pCapture->get_Volume(&lVol);
      if (lVol == 0)
         pCapture->put_Volume(-10000);

      // adjust the balance
      pCapture->get_Balance(&lBalance);
      if (lBalance != 0)
         pCapture->put_Balance(0);
   }
}