Get the instance ID of a joystick.
int device_index);SDL_JoystickID SDL_JoystickGetDeviceInstanceID(
|device_index||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 -1.
This can be called before any joysticks are opened.
This function is available since SDL 2.0.6.