This MCI command message stops all play and record sequences, unloads all play buffers, and ceases display of video images. Support of this message by a device is optional. The parameters and flags for this message vary according to the selected device.
DWORD lParam1
The following flags apply to all devices supporting MCI_STOP:
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 lpStop.
MCI_WAIT
Specifies that the device should stop before MCI returns control to the application.
LPMCI_GENERIC_PARMS lParam2
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.
The difference between MCI_STOP and MCI_PAUSE depends upon the device. If possible, MCI_PAUSE suspends device operation but leaves the device ready to resume play immediately.