mmioFlush function

The mmioFlush function writes the I/O buffer of a file to disk if the buffer has been written to.


MMRESULT mmioFlush(
  HMMIO hmmio,
  UINT  fuFlush



File handle of a file opened by using the mmioOpen function.


Flag determining how the flush is carried out. It can be zero or the following.

Value Description
MMIO_EMPTYBUF Empties the buffer after writing it to the disk.

Return value

Returns zero if successful or an error otherwise. Possible error values include the following.

Return code Description
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.


Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header mmiscapi.h (include Mmiscapi.h, Windows.h)
Library Winmm.lib
DLL Winmm.dll