This message is sent to an I/O procedure to request all subsequent mmioWrite calls to an I/O procedure for a file be treated as temporary changes. The changes will not be saved to the file when closed by mmioClose unless an MMIOM_SAVE message is received.

pmmioinfo (PMMIOINFO)

A pointer to an MMIOINFO data structure.

usMsg (USHORT)

Set to MMIOM_TEMPCHANGE.

lParam1 (LONG)

This parameter contains a pointer to a null-terminated string which has the name of a directory where a temporary file should be created.

lParam2 (LONG)

This parameter is not used.

rc (ULONG)

Return codes indicating success or failure:

MMIO_SUCCESS

The file is recording changes as temporary.
MMIO_ERROR
An error code is returned.

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