Returns the SDL compatible GUID of the specified joystick.
This function returns the SDL compatible GUID, as a UTF-8 encoded hexadecimal string, of the specified joystick. The returned string is allocated and freed by GLFW. You should not free it yourself.
The GUID is what connects a joystick to a gamepad mapping. A connected joystick will always have a GUID even if there is no gamepad mapping assigned to it.
If the specified joystick is not present this function will return
but will not generate an error. This can be used instead of first calling
The GUID uses the format introduced in SDL 2.0.5. This GUID tries to uniquely identify the make and model of a joystick but does not identify a specific unit, e.g. all wired Xbox 360 controllers will have the same GUID on that platform. The GUID for a unit may vary between platforms depending on what hardware information the platform specific APIs provide.
stringThe UTF-8 encoded GUID of the joystick, or
NULLif the joystick is not present or an