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MIDM_CLOSE
 
        This message is sent to a MIDI input device driver to deallocate
        a specified device.
 
Parameters
        DWORD dwParam1
            Unused.
 
        DWORD dwParam2
            Unused.
 
Return value
        The return value is an error code, or zero (MMSYSERR_NOERROR) if
        the operation is successful. Possible error codes are:
 
        MMSYSERR_NOTENABLED
            The driver failed to load or initialize.
 
        MIDIERR_STILLPLAYING
            There are still buffers in the queue.
 
Comments
        If there are input buffers that have been received with the
        MIDM_ADDBUFFER message and haven't been returned to the
        application, the driver should fail the close operation and return
        MIDIERR_STILLPLAYING. If the close operation is successful, the
        driver should use the DriverCallback function to send the
        client a MIM_CLOSE message.
 
See also
        MIDM_OPEN
 
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