This message is sent to the IOProc to determine the number of images that are stored in the image file.

pmmioinfo (PMMIOINFO)

A pointer to an MMIOINFO data structure.

usMsg (USHORT)

Set to MMIOM_QUERYIMAGECOUNT.

pulParam1 (PULONG)

Pointer to a ULONG that will contain the count of images in this file when the command completes.

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
This command is not supported by this image IOProc, so it should be interpreted as supporting only one image.

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