This message is sent to an IOProc by mmioSeek to request that the current file position (as maintained by the I/O procedure and stored in the lDiskOffset field of the MMIOINFO structure) be moved.

pmmioinfo (PMMIOINFO)

A pointer to an MMIOINFO data structure.

usMsg (USHORT)

Set to MMIOM_SEEK.

lParam1 (LONG)

The signed distance (offset) to move, specified as bytes.

lParam2 (LONG)

Contains one of the following values:

SEEK_SET

Moves the file pointer to be lParam1 bytes from the beginning of the file.
MMIO_SEEK_IFRAME
This results in a seek to the nearest I-frame preceding the position determined by lParam1 and the other lParam2 flags.
SEEK_CUR
Moves the file position to be lParam1 bytes from the current position. lParam1 can be positive or negative.
SEEK_END
Moves the file position to be lParam1 bytes from the end of the file. lParam1 can be positive or negative.

rc (ULONG)

Returns the new file position or MMIO_ERROR if the seek was not successful.

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