hmmio (HMMIO) - input

The open file handle returned by mmioOpen.

plHeaderLength (PLONG) - output

Pointer to a LONG. The size of the header in bytes is returned. If the MMIO_TRANSLATEHEADER flag was set in the ulTranslate field of MMIOINFO on mmioOpen, it is the size of one of the standard headers listed below. Otherwise, it is the size of a native (untranslated) header for this type of file.

ulReserved (ULONG) - input

Reserved for future use and must be set to zero.

ulFlags (ULONG) - input

Reserved for future use and must be set to zero.

rc (ULONG) - returns

Return codes indicating success or type of failure:

MMIO_SUCCESS

If the function succeeds, 0 is returned.
MMIO_ERROR
The specified file is not a media file format type.
MMIOERR_INVALID_PARAMETER
An invalid parameter was passed.
MMIOERR_INVALID_HANDLE
The handle passed was not valid.
MMIOERR_SEEK_FAILED
A seek operation prior to a write- or read-advance operation failed.

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