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Starts the flushing operation.
HRESULT BeginFlush( );
Return Values
Returns S_OK if successful, S_FALSE otherwise.
Remarks
Causes all outstanding reads to return, possibly with a failure code ( VFW_E_TIMEOUT), indicating that the outstanding reads were canceled. Between IAsyncReader::BeginFlushand IAsyncReader::EndFlushcalls, IAsyncReader::Requestcalls will fail and IAsyncReader::WaitForNextcalls will always complete immediately.