SDL segfault when trying to draw to screen

Code:

---

if ( SDL_Init(SDL_INIT_AUDIO|SDL_INIT_VIDEO) < 0 )
        {
                printf("Unable to init SDL: %s\n", SDL_GetError());
                exit(1);
        }
        atexit(SDL_Quit);
        screen=SDL_SetVideoMode(1024,768,32,SDL_HWSURFACE|SDL_DOUBLEBUF|SDL_FULLSCREEN);
        if ( screen == NULL )
        {
                printf("Unable to set video: %s\n", SDL_GetError());
                exit(1);
        }
       
        drawString(screen, font, 0, 0, "Loaded!\n");

---

It Segfaults at the drawString.

I've tried blitting surfaces to the screen and all, but it still segfaults whenever I try to draw to the screen.

I fixed it. It semms i wasn't initializeing certain objects.

You need to lock/unlcok a surface before using it.

Code:

---

void render()
{ 
 
 // Lock surface if needed
  if (SDL_MUSTLOCK(Screen))
    if (SDL_LockSurface(Screen) < 0)
      return;

  //draw to screen here

  // Unlock if needed
    if (SDL_MUSTLOCK(Screen))
        SDL_UnlockSurface(Screen);

  // Tell SDL to update the whole gScreen
    SDL_UpdateRect(Screen, 0, 0, WIDTH, HEIGHT);   
}

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