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MMIOM_WRITE message

  • Article

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

Pointer to a buffer containing the data to write to the file.

cbWrite

Number of bytes to write to file.

Return Value

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.

Requirements

Requirement Value
Minimum supported client
 Windows 2000 Professional [desktop apps only]
Minimum supported server
 Windows 2000 Server [desktop apps only]
Header
Mmsystem.h (include Windows.h)