MIDM_CLOSE

See also MIDM_OPEN

Sent to a MIDI input device driver to deallocate a specified device.

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.

DWORD dwParam1

Unused.

DWORD dwParam2

Unused.

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 by returning MIDIERR_STILLPLAYING. If the close operation is successful, the driver should use the DriverCallback function to send the client a MIM_CLOSE message.