function writes the I/O buffer of a file to disk if the buffer has been
| HMMIO hmmio,
| UINT fuFlush
File handle of a file opened by using the mmioOpen
Flag determining how the flush is carried out. It can be zero or the following:
||Empties the buffer after writing it to the disk.
Returns zero if successful or an error otherwise. Possible error values
include the following:
||The contents of the buffer could not be written to disk.
Closing a file with the mmioClose
function automatically flushes its buffer.
If there is insufficient disk space to write the buffer, mmioFlush
fails, even if the preceding calls of the mmioWrite
function were successful.
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