Get the numeric ID of a window.
Uint32 SDL_GetWindowID(SDL_Window * window);
|window||the window to query|
Returns the ID of the window on success or 0 on failure; call SDL_GetError() for more information.
The numeric ID is what SDL_WindowEvent references, and is necessary to map these events to specific SDL_Window objects.
This function is available since SDL 2.0.0.