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; // set this to a unique value in your application
OLE_HANDLE dataWrittenEvent;
OLE_HANDLE listChangedEvent;
OLE_HANDLE offsetReachedEvent;
// create the offset reached event
ILMDVRSink_CreateEvents2(pSink, registrationId, GetCurrentProcessId(), &dataWrittenEvent, &listChangedEvent, &offsetReachedEvent);
// instruct the sink to set the offset reached event once it reached nBytes past offset startOffset
ILMDVRSink_SetOffsetToReach(pSink, registrationId, (double)(startOffset + nBytes));
// wait for the event to be set
WaitForSingleObject((HANDLE)offsetReachedEvent, INFINITE);
// free the events
ILMDVRSink_FreeEvents(pSink, registrationId);
}
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