MMIOM_WRITE

The MMIOM_WRITE message is sent to an I/O procedure by the mmioWrite function to request that data be written to an open file.

MMIOM_WRITE 
lParam1 = (LPARAM) lpBuffer 
lParam2 = (LPARAM) cbWrite 
 

Parameters

lpBuffer

Address of a buffer containing the data to write to the file.

cbWrite

Number of bytes to write to file.

Return Values

Returns the number of bytes actually written to the file. If there is an error, the return value is – 1.

Remarks

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.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in mmsystem.h.

See Also

Multimedia File I/O Overview, Multimedia File I/O Messages, mmioWrite, MMIOINFO