IltmmAudioFormats::get_Count Example for C++

// Having an IltmmCapture Interface, pCap:



IltmmAudioFormats *pAudioFormats;

IltmmAudioFormat *pAudioFormat;

long   lCount;

long lFreq, lBits, lChannels;

long lFoundAt;

long lSelection;

VARIANT_BOOL bSelected;



// get the audio formats collection: 

pCap->get_AudioCaptureFormats(&pAudioFormats);

pAudioFormats->get_Count(&lCount);



for( i=0; i<lCount; i++ )

{

   // get the item at index I

   pAudioFormats->Item(i, 
 &pAudioFormat);

   

   // do something with this item, like viewing its information:

   pAudioFormat->get_SampleFrequency(&lFreq);

   pAudioFormat->get_BitsPerSample(&lBits);

   pAudioFormat->get_Channels(&lChannels);

   pAudioFormat->get_Selected(&bSelected);



   // view information …



   // you may select the format if it matches some criteria:

   if( lFreq == 8000 && lBits == 8 && lChannels 
 == 1 )

         pAudioFormat->put_Selected(VARIANT_TRUE);



   // free the item

   pAudioFormat->Release(); 

}



// you might use the Find method to search for a specific format:

pAudioFormats->Find(16000, 
 16, 2, &lFoundAt);

If( lFoundAt != -1 )

{

   // do something with it:

   // check if it is already selected, and if not, select it:

   pAudioFormats->get_Selection(&lSelection);

   If( lSelection != lFoundAt )

   {

      pAudioFormats->put_Selection(lFoundAt);

   }

}



// free the audio formats collection 

 pAudioFormats->Release();