IltmmAudioFormats::get_Count Example for C

void IltmmAudioFormats_get_Count_Example (IltmmCapture* pCapture) 
{ 
   IltmmAudioFormats *pAudioFormats; 
   IltmmAudioFormat *pAudioFormat; 
   long   lCount; 
   long lFreq, lBits, lChannels; 
   long lFoundAt; 
   long lSelection; 
   VARIANT_BOOL bSelected; 
   int i; 
 
   // get the audio formats collection:  
   IltmmCapture_get_AudioCaptureFormats(pCapture, &pAudioFormats); 
   IltmmAudioFormats_get_Count(pAudioFormats, &lCount); 
 
   for( i=0; i<lCount; i++ ) 
   { 
	   // get the item at index I 
	   IltmmAudioFormats_Item(pAudioFormats, i, &pAudioFormat); 
 
	   // do something with this item, like viewing its information: 
	   IltmmAudioFormat_get_SampleFrequency(pAudioFormat, &lFreq); 
	   IltmmAudioFormat_get_BitsPerSample(pAudioFormat, &lBits); 
	   IltmmAudioFormat_get_Channels(pAudioFormat, &lChannels); 
	   IltmmAudioFormat_get_Selected(pAudioFormat, &bSelected); 
 
	   // view information ... 
 
	   // you may select the format if it matches some criteria: 
	   if( lFreq == 8000 && lBits == 8 && lChannels == 1 ) 
		   IltmmAudioFormat_put_Selected(pAudioFormat, VARIANT_TRUE); 
 
	   // free the item 
	   IUnknown_Release(pAudioFormat);  
   } 
 
   // you might use the Find method to search for a specific format: 
   IltmmAudioFormats_Find(pAudioFormats, 16000, 16, 2, &lFoundAt); 
    
   if( lFoundAt != -1 ) 
   { 
	   // do something with it: 
	   // check if it is already selected, and if not, select it: 
	   IltmmAudioFormats_get_Selection(pAudioFormats, &lSelection); 
	  
      if( lSelection != lFoundAt ) 
	   { 
		   IltmmAudioFormats_put_Selection(pAudioFormats, lFoundAt); 
	   } 
   } 
 
   // free the audio formats collection  
   IUnknown_Release(pAudioFormats); 
}

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