SDL wont display .png image

This is a discussion on SDL wont display .png image within the C++ Programming forums, part of the General Programming Boards category; My program opens, without returning -1, or showing the image, and I was wonderng why this happens. here is my ...

  1. #1
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    Exclamation SDL wont display .png image

    My program opens, without returning -1, or showing the image, and I was wonderng why this happens.

    here is my code
    Code:
    #include <SDL/SDL.h>
    #include <SDL/SDL_image.h>
    
    SDL_Surface *buffer = 0;
    SDL_Surface *man = 0;
    
    void draw_surface(SDL_Surface* sur, int x, int y){
        SDL_Rect pos;
        pos.x = x;
        pos.y = y;
    
        SDL_BlitSurface(sur, 0, buffer, &pos);
    }
    
    SDL_Surface *draw_img(const char *filename){
        SDL_Surface *img = IMG_Load(filename);
    
        if(man != 0){
            SDL_SetColorKey(img, SDL_SRCCOLORKEY, 0xFFFF00);
        }
        return(img);
    }
    
    int main(int argc, char *argv[]){
        SDL_Init(SDL_INIT_VIDEO);
        buffer = SDL_SetVideoMode(640, 480, 32, SDL_SWSURFACE);
    
        man = draw_img("person.png");
    
        if(man == 0){
            return -1;
        }
    
        bool run = true;
        SDL_Event event;
    
        while(run){
            while(SDL_PollEvent(&event)){
            if(event.type == SDL_QUIT){
                run = false;
            }
            }
            draw_surface(man, 0, 0);
        }
    
        SDL_FreeSurface(man);
        SDL_Quit();
        return 1;
    }
    Last edited by bijan311; 04-24-2010 at 12:55 PM.

  2. #2
    and the hat of int overfl Salem's Avatar
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    Your other SDL functions also return success/fail.
    How about checking them as well?
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  3. #3
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    I changed man in
    Code:
    if(man != 0)
    to
    Code:
    if(img != 0);

  4. #4
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    I'm not sure if this would help but, when I go to the executable file in windows explorer it closes automatically

  5. #5
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    Are you sure the image you're trying to load is in the same folder as the program expects it to be? Additionally, to actually get the image to show after you blit it to the 'buffer' surface, remember to call SDL_Flip on it to update the display.(Added that to your code and the picture showed up fine when the file was in the correct spot).

  6. #6
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    Thanks!

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