WORD midiOutClose(hMidiOut)
This function closes the specified MIDI output device.
HMIDIOUT hMidiOut
Specifies a handle to the MIDI output device. If the function is successful, the handle is no longer valid after this call.
Returns zero if the function was successful. Otherwise, it returns an error number. Possible error returns are:
MMSYSERR_INVALHANDLE
Specified device handle is invalid.
MIDIERR_STILLPLAYING
There are still buffers in the queue.
If there are output buffers that have been sent with midiOutLongMsg and haven't been returned to the application, the close operation will fail. Call midiOutReset to mark all pending buffers as being done.
midiOutOpen, midiOutReset