Get the implementation-dependent GUID for the joystick at a given device index.
int device_index);SDL_JoystickGUID SDL_JoystickGetDeviceGUID(
|device_index||the index of the joystick to query (the N'th joystick on the system|
Returns the GUID of the selected joystick. If called on an invalid index, this function returns a zero GUID
This function can be called before any joysticks are opened.
This function is available since SDL 2.0.0.