def getMednafenJoypadIds():
    # Start Mednafen without a valid rom to load the nes emulator module,
    # and catch the output of its joypad ID.
    # The compare thode to the joypad names we get from input and attach them.

    output = subprocess.Popen( shlex.split( 'mednafen -remote "###TEST###" "notexistinggamerom.nes"'), cwd = os.path.join( os.path.expanduser( '~')), stderr=subprocess.STDOUT,stdout=subprocess.PIPE).communicate()[0].decode("utf8").split('###TEST###')

    for line in output:
        if line[0:22] == 'status_message "  ID: ':
            guid, name = line[22:-5].split(' - ')
            for device in devices.gamepads:
                if device.name == name:
                    device.guid = guid