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
lParam1 = (LPARAM) lBuffer
lParam2 = (LPARAM) cbRead
Address of the buffer to be filled with data read from the file.
Number of bytes to read from file.
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
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.
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