Get the instance ID of a joystick.
int device_index);SDL_JoystickID SDL_JoystickGetDeviceInstanceID(
the index of the joystick to query (the N'th joystick on the system
Returns the instance id of the selected joystick. If called on an invalid index, this function returns zero
This can be called before any joysticks are opened. If the index is out of range, this function will return -1.
This function is available since SDL 2.0.6.