This MCI command message realeases access to a device or device element. All devices respond to this message.
DWORD dwFlags
The following flags apply to all devices:
MCI_NOTIFY
Specifies that MCI should post the MM_MCINOTIFY message when this command completes. The window to receive this message is specified in the dwCallback field of the data structure identified by lpDefault.
MCI_WAIT
Specifies that the close operation should finish before MCI returns control to the application.
LPMCI_GENERIC_PARMS lpDefault
Specifies a far pointer to the MCI_GENERIC_PARMS data structure. (Devices with extended command sets might replace this data structure with a device-specific data structure.)
Returns zero if successful. Otherwise, it returns an MCI error code.
Exiting an application without closing any MCI devices it has opened can leave the
device opened and unaccessible. Your application should explicitly close each device
or device element when it is finished with it. MCI unloads the device when all instances
of the device or all device elements are closed.
MCI_OPEN