Question

I have a small script which is meant to get the user’s screen resolution and assign it to a variable but i get an Access Violation error and not sure how to fix it (I’m quite new to this language) so was hoping some one can show me how I should write it.

This is my setup:

//get player's screen info
const SDL_VideoInfo* myScreen = SDL_GetVideoInfo();

//SDL screen
SDL_Surface *screen;
int reso_x = myScreen->current_w; //resolution width (ERROR here)
int reso_y = myScreen->current_h; //resolution height
Uint8  video_bpp = 32;
Uint32 videoflags = SDL_SWSURFACE | SDL_DOUBLEBUF | SDL_ANYFORMAT;// | SDL_FULLSCREEN;

/* Initialize the SDL library */
if ( SDL_Init(videoflags) < 0 ) {
     fprintf(stderr, "Couldn't initialize SDL: %s\n",
     SDL_GetError());
     exit(1);
     }

//setup Screen
screen = SDL_SetVideoMode(reso_x, reso_y, video_bpp, videoflags|SDL_FULLSCREEN);

Does any one know the cause of my mistake?

Answer 1

You shouldn’t make any SDL calls before SDL_init. My guess is GetVideoInfo is returning null because you are not in a valid state at that point. Also the flags you are passing to init are wrong, it should be SDL_INIT_VIDEO not what kind of video you want. Your video flags should go to the SetVideoMode function.