This message requires that a valid hmmio handle be returned from
a successful call to MMIOM_OPEN
See mmioGetHeader for more information
about header information.
Examples of some header structures that lParam1 might point to are:
- MMIMAGEHEADER
(includes structure length, content, size, color type, and other information,
including space for a 256-color palette)
- MMAUDIOHEADER
(includes such data as structure length, content, samples per second,
and sample size)
- MMMIDIHEADER
(contains all pertinent information about the MIDI)
- MMMOVIEHEADER
- MMVIDEOHEADER
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