mmioDetermineSSIOProc Return Value - rc

rc (ULONG) - returns

Return codes indicating success or type of failure. For information about DOS File errors, see ulErrorRet in MMIOINFO.

MMIO_SUCCESS

If the function succeeds, 0 is returned.
MMIO_ERROR
Unable to determine the FOURCC of the IOProc.
MMIOERR_INVALID_PARAMETER
An invalid parameter was passed.

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