ILMDVRSink::SetOffsetToReach Example for C++

This example shows how you can wait for the DVR sink to write data past a certain offset. This is useful if you want to wait for the data to become available before reading it. The error checking has been omitted for clarity. 

void WaitForData(ILMDVRSink* pSink, __int64 startOffset, long nBytes) 
{ 
   long registrationId = (long)GetTickCount(); // set this to a unique value in your application 
   OLE_HANDLE dataWrittenEvent; 
   OLE_HANDLE listChangedEvent; 
   OLE_HANDLE offsetReachedEvent; 
 
   // create the offset reached event 
   pSink->CreateEvents2(registrationId, GetCurrentProcessId(), &dataWrittenEvent, &listChangedEvent, &offsetReachedEvent); 
 
   // instruct the sink to set the offset reached event once it reached nBytes past offset startOffset 
   pSink->SetOffsetToReach(registrationId, (double)(startOffset + nBytes)); 
 
   // wait for the event to be set 
   WaitForSingleObject((HANDLE)offsetReachedEvent, INFINITE); 
 
   // free the events 
   pSink->FreeEvents(registrationId); 
}

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