MMIOM_QUERYIMAGE - Description

This message is sent to an image IOProc to determine the currently selected image index in the image file.

pmmioinfo (PMMIOINFO)

A pointer to an MMIOINFO data structure.

usMsg (USHORT)

Set to MMIOM_QUERYIMAGE.

pulParam1 (PULONG)

Pointer to a ULONG that will contain the current image index upon return. Image indexes are zero-based.

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 having the 0th index image selected.

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