This message is sent to an image IOProc to select a new image index in the image file.

pmmioinfo (PMMIOINFO)

Pointer to an MMIOINFO data structure.

usMsg (USHORT)

Set to MMIOM_SETIMAGE.

ulParam1 (ULONG)

A ULONG containing the new image index. If the index is less than the count, then an existing image will be addressed. If the index is equal to the count, then a new image will be created when mmioSetHeader is called. Indexes greater than the count will generate an error.

lParam2 (LONG)

This parameter is not used.

rc (ULONG)

Return codes indicating success or failure.

MMIO_SUCCESS

The request was successful.
MMIO_ERROR
An error code is returned.
MMIOERR_UNSUPPORTED_FUNCTION
The IOProc does not support multiple images.

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