The MMIOM_WRITEFLUSH message is sent to an I/O procedure by the mmioWrite
function to request that data be written to an open file and that any
internal buffers used by the I/O procedure be flushed to disk.
lParam1 = (LPARAM) lpBuffer
lParam2 = (LPARAM) cbWrite
Address of a buffer containing the data to write to the file.
Number of bytes to write to file.l
Returns the number of bytes actually written to the file. If there is an
error, the return value is
The I/O procedure is responsible for updating the lDiskOffset
member of the MMIOINFO
structure to reflect the new file position after the write operation.
This message is equivalent to the MMIOM_WRITE message except that it requests
that the I/O procedure flush its internal buffers, if any. Unless an I/O
procedure performs internal buffering, this message can be handled exactly like the
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