The MMIOM_CLOSE message is sent to an I/O procedure by the mmioClose function to request that a file be closed.
MMIOM_CLOSE
lParam1 = (LPARAM) lCloseFlags
lParam2 = reserved
Returns zero if the file is successfully closed or an error otherwise.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in mmsystem.h.
Multimedia File I/O Overview, Multimedia File I/O Messages, mmioClose