MMIOM_BEGINSTREAM Return Value - rc

rc (ULONG)

Return codes indicating success or failure:

MMIO_SUCCESS

The file is in streaming mode.
MMIOERR_UNSUPPORTED_MESSAGE
IOProc does not support this message.
MMIOERR_QOSUNAVAILABLE
Quality of service is unavailable.
MMIO_ERROR
Streaming was unsuccessful due to other errors.

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