SDL_GameControllerGetButton depends on polling events

ramin22 · February 17, 2018, 5:25pm

Hi
In the code below if i uncomment lines 11 to 18 then my program starts working correctly,
i.e if i press ButtonA on my gamepad I can exit.
But when those lines are commented like they are right now, then gamepad doesn’t work.

why is that?
thanks in advance.

#include <SDL2/SDL.h>
#include “stdio.h”
int main()
{
```
SDL_Init(SDL_INIT_GAMECONTROLLER);
```

SDL_Window *Window = SDL_CreateWindow("Hello SDL", 50, 50, 500, 500, 0);

if (SDL_IsGameController(0) == SDL_TRUE) {

    SDL_GameController *Controller = SDL_GameControllerOpen(0);

```
    while (1) {
```
```
        /*
```
```
        SDL_Event *Event = NULL; 
```
```
        SDL_PollEvent(Event);
```
```
        while (Event != NULL) {
```

            if (Event->type == SDL_QUIT) {

```
                return 0;
```
```
            }
```
```
            SDL_PollEvent(Event);
```
```
        }
```
```
        */
```

        int ButtonA = SDL_GameControllerGetButton(Controller, SDL_CONTROLLER_BUTTON_A);

        int ButtonB = SDL_GameControllerGetButton(Controller, SDL_CONTROLLER_BUTTON_B);

```
        if (ButtonA == 1) {
```
```
            break;
```
```
        }
```
```
        if (ButtonB == 1) {
```

            printf("ButtonB is Down\n");

```
        }
```
```
    }
```
```
}
```
```
else {
```

    printf("the joystick is not a game controller\n");

```
}
```
}