How to Copy buffered DVR data to a new file (C++)

The following method for C++ shows how to get the DVR Sink object from the ltmmPlayControl object and use it to copy DVR buffered data to a new file.

void PlayerDVRCopyToFile(IltmmPlay *pPlay)  
   IUnknown *punk = NULL;  
   HRESULT hr = pPlay->GetSubObject(ltmmPlay_Object_SourceFilter, &punk); 
   if(SUCCEEDED(hr) && NULL != punk)  
      ILMDVRSink *pDvrSink;  
      hr = punk->QueryInterface(IID_ILMDVRSink, (LPVOID*)&pDvrSink);  
      if (SUCCEEDED(hr))  
         double start, stop, total;  
          // Get available range to copy  
         pDvrSink->GetAvailabilityInfo(&start, &stop, &total);  
          // Copy the data to the new file  
         pDvrSink->CopyBufferToFile(L"C:\\Temp\\DVR\\Copied_Capture.mpg", start, stop); 
          // Release the interface and free string data  

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