This message requests the IOProc to return the size of the header for the current file or file element. The file was opened with mmioOpen.

pmmioinfo (PMMIOINFO)

A pointer to an MMIOINFO data structure.

usMsg (USHORT)

Set to MMIOM_QUERYHEADERLENGTH.

lParam1 (LONG)

This parameter is not used.

lParam2 (LONG)

This parameter is not used.

rc (ULONG)

• Upon successful completion, the size of the header, in bytes, is returned.

• For a failure, 0 is returned.

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