IltmmAudioFormats::get_Count Example for C++

void GetAudioFormatsCount(IltmmCapture *pCapture) 
{ 
   IltmmAudioFormats *pAudioFormats; 
   IltmmAudioFormat *pAudioFormat; 
   int  i; 
   long lCount; 
   long lFreq, lBits, lChannels; 
   long lFoundAt; 
   long lSelection; 
   VARIANT_BOOL bSelected; 
 
   // get the audio formats collection:  
   pCapture->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(); 
}

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