This message is sent to an IOProc by mmioWrite to request that bytes be written to an open file.

pmmioinfo (PMMIOINFO)

A pointer to an MMIOINFO data structure.

usMsg (USHORT)

Set to MMIOM_WRITE.

lParam1 (LONG)

A pointer (PCHAR) to the buffer to write form.

lParam2 (LONG)

The number of bytes to write.

rc (ULONG)

Returns the number of bytes actually written or MMIO_ERROR if the write was not successful.

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