使用SDL2捕获按键

Question

Have 2 questions related to using SDL2.

1. I want to capture all the keyboard inputs in my C++ app. The app is a COM dll that will run in the background and will capture all the inputs. So this app doesn't have a window, in this case is it possible to capture keyboard inputs? If yes, how?

I have seen examples for SDL2 where they 1st create a SDL window and then capture keyboard inputs. But i don't want that. What i want is my app to be able to capture all keyboard inputs by its own.

1. If i create my own window using MFC, is it possible to attach that to SDL2 and have it capture all keyboard inputs when my window is in focus. Again i don't want to create a SDL Window.

Answer 1

you can use GetAsyncKeyState it's simple and fast, this code shows you how to use it.

if(GetAsyncKeyState('Q')){//if Q key has been clicked
   //Do something
}

and here is list of all key codes http://msdn.microsoft.com/en-us/library/windows/desktop/dd375731(v=vs.85).aspx

Answer 2

So this app doesn't have a window, in this case is it possible to capture keyboard inputs?

Not with SDL.

If i create my own window using MFC, is it possible to attach that to SDL2 and have it capture all keyboard inputs when my window is in focus.

It sounds like you might have some luck with SDL_CreateWindowFrom() .

Answer 3

You could try to have an window with the SDL_WINDOW_HIDDEN flag. That way i would assume you could get he input with the sdl functions without having an window pop.

Not sure if this is what you want, but i hope it helps.