MMIOM_WRITE message
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 |
|
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