When I try to blit a .bmp picture to the screen, just a black screen shows up.
I've used SDL_LoadBMP(), SDL_BlitSurface(), and SDL_UpdateRect(), but it doesn't work. Any tips?

Post the relevant part of your code...

My error tells me that it can't open the file.
Here's the code...



SDL_Surface *image;

image = SDL_LoadBMP("one.bmp");
if (image == NULL)
{
fprintf(stderr, "Couldn't load %s: %s\n", "one.bmp", SDL_GetError());
}

SDL_BlitSurface(image, NULL, screen, NULL);

SDL_Flip(screen);

SDL_FreeSurface(image);

Is the file one.bmp in the same folder as your app? (The "build" folder, if you used Xcode).
SDL sets the default directory to the same folder as your app package, not to the Resources folder inside it (Check SDLMain.m if you want to change that)

It worked! Thanks very much!