SDL run time error

This is a discussion on SDL run time error within the Game Programming forums, part of the General Programming Boards category; Code: #include<string> #include "SDL/SDL.h" #include "SDL/SDL_image.h" #include "SDL/SDL_mixer.h" #define WIDTH 640 #define HEIGHT 480 #define BPP 32 SDL_Surface * Load_Image(std::string ...

  1. #1
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    SDL run time error

    Code:
    #include<string>
    #include "SDL/SDL.h"
    #include "SDL/SDL_image.h"
    #include "SDL/SDL_mixer.h"
    #define WIDTH  640
    #define HEIGHT  480  
    #define BPP 32
    
    
    SDL_Surface * Load_Image(std::string File)
    {
              SDL_Surface *screen;
              SDL_Surface * Optimal;  
                
                screen = IMG_Load(File.c_str());
                Optimal = SDL_DisplayFormat(screen);
                SDL_FreeSurface(screen);
                return(Optimal);
    }
    
    class player
    {
        Mix_Music *Song;
        
        bool Music_paused;
        bool Musicok;
        SDL_Event event;
        public:
         void  Musicplayer();
               player();
               ~player();
    };
    
    player::player()
    {
                 Mix_OpenAudio(22050,MIX_DEFAULT_FORMAT ,2,4096);
                     
                     Music_paused= false;
                     Musicok= true;
                     Song = NULL;
    }
    
    player::~player()
    {
                     Mix_CloseAudio();
                     Musicok=true;
                     Music_paused=false;
                     Mix_FreeMusic(Song);
                     Song = NULL;
    }
    
    void player::Musicplayer()
    {
         int quit= 0;
         Uint8 *Keystate = SDL_GetKeyState(NULL);
         
         while(quit != 1)
         {
              while(SDL_PollEvent(&event))
              {
                switch(event.type)
                {
                  case SDL_KEYDOWN :
                       if(Keystate[SDLK_1])
                       {  if(Musicok == true)
                             Song = Mix_LoadMUS("TEST.mp3");
                         else 
                             {  Mix_FreeMusic(Song);
                                Song = Mix_LoadMUS("TEST.mp3");
                             }
                       Musicok = false;
                       }
                       if(Keystate[SDLK_2])
                       {  if(Musicok == true)
                             Song = Mix_LoadMUS("TEST2.mp3");
                         else
                             {  Mix_FreeMusic(Song);
                                Song = Mix_LoadMUS("TEST2.mp3");
                             }
                       Musicok = false;
                       }
                       if(Keystate[SDLK_SPACE])
                       {   if(Musicok == true)
                           Mix_PlayMusic(Song, -1);
                           else
                           Mix_RewindMusic();
                       }
                       if(Keystate[SDLK_RETURN])
                       {   if(Music_paused == false)
                          {Mix_PauseMusic();
                           Music_paused = true;}
                           else
                           Mix_ResumeMusic();
                       }
                       break;
                  case SDL_QUIT :
                       quit = 1;
                       break;
               }
         }
    }
    }
     void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination )
    {
        //Make a temporary rectangle to hold the offsets
        SDL_Rect offset;
        
        //Give the offsets to the rectangle
        offset.x = x;
        offset.y = y;
    //Blit the surface
        SDL_BlitSurface( source, NULL, destination, &offset );
    }
    
     
     
     
     int main( int argc, char* args[] )
     {
       SDL_Surface *screen;
       SDL_Surface *image;
       
       SDL_Init(SDL_INIT_EVERYTHING); 
         
       SDL_SetVideoMode(WIDTH,HEIGHT,BPP,SDL_HWSURFACE);
         
          
       image = Load_Image("sdl_test");
       
       apply_surface(0,0,image,screen);
       
       player Test;
       
       SDL_Event event;
       int i =1;
       
       while( i != 0)
       {
         while(SDL_PollEvent(&event))
         {
           Test.Musicplayer();
           switch(event.type)
           {
             case SDL_QUIT :
                  i = 0;
                  break;
           }
         
         }
       }
       
       SDL_FreeSurface(screen);
       SDL_FreeSurface(image);
       SDL_Quit();
       return 0;
    }
    well my program when run, blinks off and on

  2. #2
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    Add SDL_DOUBLEBUF to SDL_SetVideoMode(), move the call to apply_surface() after the switch and then add a call to SDL_Flip(screen).

  3. #3
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    Code:
    #include<string>
    #include "SDL/SDL.h"
    #include "SDL/SDL_image.h"
    #include "SDL/SDL_mixer.h"
    #define WIDTH  640
    #define HEIGHT  480  
    #define BPP 32
    
    
    SDL_Surface * Load_Image(std::string File)
    {
              SDL_Surface *screen;
              SDL_Surface * Optimal;  
                
                screen = IMG_Load(File.c_str());
                Optimal = SDL_DisplayFormat(screen);
                SDL_FreeSurface(screen);
                return(Optimal);
    }
    
    class player
    {
        Mix_Music *Song;
        
        bool Music_paused;
        bool Musicok;
        SDL_Event event;
        public:
         void  Musicplayer();
               player();
               ~player();
    };
    
    player::player()
    {
                 Mix_OpenAudio(22050,MIX_DEFAULT_FORMAT ,2,4096);
                     
                     Music_paused= false;
                     Musicok= true;
                     Song = NULL;
    }
    
    player::~player()
    {
                     Mix_CloseAudio();
                     Musicok=true;
                     Music_paused=false;
                     Mix_FreeMusic(Song);
                     Song = NULL;
    }
    
    void player::Musicplayer()
    {
         int quit= 0;
         Uint8 *Keystate = SDL_GetKeyState(NULL);
         
         while(quit != 1)
         {
              while(SDL_PollEvent(&event))
              {
                switch(event.type)
                {
                  case SDL_KEYDOWN :
                       if(Keystate[SDLK_1])
                       {  if(Musicok == true)
                             Song = Mix_LoadMUS("TEST.mp3");
                         else 
                             {  Mix_FreeMusic(Song);
                                Song = Mix_LoadMUS("TEST.mp3");
                             }
                       Musicok = false;
                       }
                       if(Keystate[SDLK_2])
                       {  if(Musicok == true)
                             Song = Mix_LoadMUS("TEST2.mp3");
                         else
                             {  Mix_FreeMusic(Song);
                                Song = Mix_LoadMUS("TEST2.mp3");
                             }
                       Musicok = false;
                       }
                       if(Keystate[SDLK_SPACE])
                       {   if(Musicok == true)
                           Mix_PlayMusic(Song, -1);
                           else
                           Mix_RewindMusic();
                       }
                       if(Keystate[SDLK_RETURN])
                       {   if(Music_paused == false)
                          {Mix_PauseMusic();
                           Music_paused = true;}
                           else
                           Mix_ResumeMusic();
                       }
                       break;
                  case SDL_QUIT :
                       quit = 1;
                       break;
               }
         }
    }
    }
     void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination )
    {
        //Make a temporary rectangle to hold the offsets
        SDL_Rect offset;
        
        //Give the offsets to the rectangle
        offset.x = x;
        offset.y = y;
    //Blit the surface
        SDL_BlitSurface( source, NULL, destination, &offset );
    }
    
     
     
     
     int main( int argc, char* args[] )
     {
       SDL_Surface *screen;
       SDL_Surface *image;
       
       SDL_Init(SDL_INIT_EVERYTHING); 
         
      screen = SDL_SetVideoMode(WIDTH,HEIGHT,BPP,SDL_DOUBLEBUF);
         
          
       image = Load_Image("sdl_test");
       
      
       
       player Test;
       
       SDL_Event event;
       int i =1;
       
       while( i != 0)
       {
         while(SDL_PollEvent(&event))
         {
           Test.Musicplayer();
           switch(event.type)
           {
             case SDL_QUIT :
                  i = 0;
                  break;
           }
          
         }
       }
       apply_surface(0,0,image,screen);
       
       SDL_Flip(screen);
       SDL_FreeSurface(screen);
       SDL_FreeSurface(image);
       SDL_Quit();
       return 0;
    }
    this is what i alternated soo far

  4. #4
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    You need to put the rendering code (apply_surface() and SDL_Flip() ) in the message loop (i.e. the outer while loop) ..

  5. #5
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    i know in the first loop (outer) but ssame result

  6. #6
    int x = *((int *) NULL); Cactus_Hugger's Avatar
    Join Date
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    902
    Are you sure your code isnt inside of Test.Musicplayer(), and therefore not rendering? Repost what has changed... (use a debugger to see if it ever passes Musicplayer() when you think it should be rendering...)
    long time; /* know C? */
    Unprecedented performance: Nothing ever ran this slow before.
    Any sufficiently advanced bug is indistinguishable from a feature.
    Real Programmers confuse Halloween and Christmas, because dec 25 == oct 31.
    The best way to accelerate an IBM is at 9.8 m/s/s.
    recursion (re - cur' - zhun) n. 1. (see recursion)

  7. #7
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    Code:
    #include<string>
    #include "SDL/SDL.h"
    #include "SDL/SDL_image.h"
    #include "SDL/SDL_mixer.h"
    #define WIDTH  640
    #define HEIGHT  480  
    #define BPP 32
    
    SDL_Surface *screen;
    
    SDL_Surface *image;
    
    void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination )
    {
        //Make a temporary rectangle to hold the offsets
        SDL_Rect offset;
        
        //Give the offsets to the rectangle
        offset.x = x;
        offset.y = y;
    //Blit the surface
        SDL_BlitSurface( source, NULL, destination, &offset );
    }
    
    
    SDL_Surface * Load_Image(std::string File)
    {
              SDL_Surface *Picture;
              SDL_Surface * Optimal;  
                
                Picture = IMG_Load(File.c_str());
                Optimal = SDL_DisplayFormat(Picture);
                SDL_FreeSurface(Picture);
                return(Optimal);
    }
    
    class player
    {
        Mix_Music *Song;
        
        bool Music_paused;
        bool Musicok;
        SDL_Event event;
        public:
         void  Musicplayer();
               player();
               ~player();
    };
    
    player::player()
    {
                 Mix_OpenAudio(22050,MIX_DEFAULT_FORMAT ,2,4096);
                     
                     Music_paused= false;
                     Musicok= true;
                     Song = NULL;
    }
    
    player::~player()
    {
                     Mix_CloseAudio();
                     Musicok=true;
                     Music_paused=false;
                     Mix_FreeMusic(Song);
                     Song = NULL;
    }
    
    void player::Musicplayer()
    {
         int quit= 0;
         Uint8 *Keystate = SDL_GetKeyState(NULL);
         
        
        
        apply_surface(0,0,image,screen);
        
        SDL_Flip( screen );
        
              
        
        
         while(quit != 1)
         {
              while(SDL_PollEvent(&event))
              {
                switch(event.type)
                {
                  case SDL_KEYDOWN :
                       if(Keystate[SDLK_1])
                       {  if(Musicok == true)
                             Song = Mix_LoadMUS("TEST.mp3");
                         else 
                             {  Mix_FreeMusic(Song);
                                Song = Mix_LoadMUS("TEST.mp3");
                             }
                       Musicok = false;
                       }
                       if(Keystate[SDLK_2])
                       {  if(Musicok == true)
                             Song = Mix_LoadMUS("TEST2.mp3");
                         else
                             {  Mix_FreeMusic(Song);
                                Song = Mix_LoadMUS("TEST2.mp3");
                             }
                       Musicok = false;
                       }
                       if(Keystate[SDLK_SPACE])
                       {   if(Musicok == true)
                           Mix_PlayMusic(Song, -1);
                           else
                           Mix_RewindMusic();
                       }
                       if(Keystate[SDLK_RETURN])
                       {   if(Music_paused == false)
                          {Mix_PauseMusic();
                           Music_paused = true;}
                           else
                           Mix_ResumeMusic();
                       }
                       break;
                  case SDL_QUIT :
                       quit = 1;
                       break;
               }
         }
    }
    }
     
    
     
     
     
     int main( int argc, char* args[] )
     {
       
       
       
       SDL_Init(SDL_INIT_EVERYTHING); 
         
      screen = SDL_SetVideoMode(WIDTH,HEIGHT,BPP,SDL_DOUBLEBUF);
         
          
       image = Load_Image("sdl_test");
       
      
       
       player Test;
       
       SDL_Event event;
       
       int i =1;
       
       
      Test.Musicplayer();
       
       while( i != 0)
       {
         while(SDL_PollEvent(&event))
         {
           
           
           if(event.type == SDL_QUIT)
               i=0;
          
         }
       
       
       }
       
       
      
    
       
       
       
    
       
       SDL_FreeSurface(screen);
       SDL_FreeSurface(image);
       SDL_Quit();
       return 0;
    }

  8. #8
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    what did i do wrong XD

  9. #9
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    Re-read cactus_hugger's last post. The answer is just so obvious..

  10. #10
    C maniac
    Join Date
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    Location
    Cyberwarping to Middle Earth
    Posts
    154
    First off, try to indent your code a bit better. Spending an extra second a line will save you 5 seconds a line when you run into problems like this.

    Code:
    image = Load_Image("sdl_test");
    What is the name of your image file name? Probably that should be changed to "sdl_test.bmp", no?

    Also, attempting
    Code:
    SDL_FreeSurface(screen);
    . . . will crash some systems (Namely mine . . .)

    Code:
      while( i != 0)
       {
         while(SDL_PollEvent(&event))
         {
           
           
           if(event.type == SDL_QUIT)
               i=0;
          
         }
    What is the purpose of this loop?

  11. #11
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    thanks and the other loop XD i put it their for main and yeaa stupid me for the image.....

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