MMIOM_READ
The
MMIOM_READ message is sent to an I/O procedure by the mmioRead function to request that a
specified number of bytes be read from an open file.
MMIOM_READ
lParam1 = (LPARAM) lBuffer
lParam2 = (LPARAM) cbRead
Parameters
lBuffer
Address of
the buffer to be filled with data read from the file.
cbRead
Number of
bytes to read from file.
Return Values
Returns the
number of bytes actually read from the file. If no more bytes can be read, the
return value is 0. 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 read operation.
See Also