This message is sent to an I/O procedure by mmioSendMessage and requests the file position (as maintained by the I/O procedure and stored in the lDiskOffset field of the MMIOINFO structure) be moved relative to some unit of time understood by the I/O procedure.

pmmioinfo (PMMIOINFO)

A pointer to an MMIOINFO data structure.

usMsg (USHORT)

Set to MMIOM_SEEKBYTIME.

lParam1 (LONG)

Contains the signed offset to move, specified in MMTIME.

lParam2 (LONG)

Specifies how the lParam1 parameter is interpreted:

SEEK_SET

Seek to an absolute (time units from the beginning of the file) seek position specified in lParam1. This is the default.
SEEK_CUR
Seek to a relative (time units from the current file position) seek position specified in lParam1. (The value of lParam1 can be positive or negative.)
SEEK_END
Seek to lParam1 time units from the end of the file. (The value of 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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