C++ SDL problem

[fireXmist]

Having using visual studio compiler with Lazy Foo's SDL tutorial 3.
http://lazyfoo.net/SDL_tutorials/les...508e/index.php

using exact same code he does but added the stdafx.h so i could use <string>. But when i run it it crashes each time. Also have the SDL_Image.dll and SDL.dll in the folder with look.png. So i dont think its a code problem either. Its a win32 console application with precompiled headers.

#include "stdafx.h"
#include "SDL.h"
#include "SDL_image.h"

#include <string>

//Screen attributes
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;

//The surfaces
SDL_Surface *image = NULL;
SDL_Surface *screen = NULL;

SDL_Surface *load_image( std::string filename )
{
    //The image that's loaded
    SDL_Surface* loadedImage = NULL;

    //The optimized image that will be used
    SDL_Surface* optimizedImage = NULL;

    //Load the image using SDL_image
    loadedImage = IMG_Load( filename.c_str() );

    //If the image loaded
    if( loadedImage != NULL )
    {
        //Create an optimized image
        optimizedImage = SDL_DisplayFormat( loadedImage );

        //Free the old image
        SDL_FreeSurface( loadedImage );
    }

    //Return the optimized image
    return optimizedImage;
}

void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination )
{
    //Rectangle to hold the offsets
    SDL_Rect offset;

    //Get offsets
    offset.x = x;
    offset.y = y;

    //Blit the surface
    SDL_BlitSurface( source, NULL, destination, &offset );
}

bool init()
{
    //Initialize all SDL subsystems
    if( SDL_Init( SDL_INIT_EVERYTHING ) == -1 )
    {
        return false;
    }

    //Set up the screen
    screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE );

    //If there was an error in setting up the screen
    if( screen == NULL )
    {
        return false;
    }

    //Set the window caption
    SDL_WM_SetCaption( "PNG test", NULL );

    //If everything initialized fine
    return true;
}

void clean_up()
{
    //Free the surface
    SDL_FreeSurface( image );

    //Quit SDL
    SDL_Quit();
}

int main( int argc, char* args[] )
{
    //Initialize
    if( init() == false )
    {
        return 1;
    }

    //Load the image
    image = load_image( "look.png" );

    //If there was a problem in loading the image
    if( image == NULL )
    {
        return 1;
    }

    //Apply the surface to the screen
    apply_surface( 0, 0, image, screen );

    //Update the screen
    if( SDL_Flip( screen ) == -1 )
    {
        return 1;
    }

    //Wait 2 seconds
    SDL_Delay( 2000 );

    //Free the surface and quit SDL
    clean_up();

    return 0;
}

[GCDEF]

Run it in the debugger.

[Amleto]

ok, so where does it crash? did you run it in a debugger?

[fireXmist]

it opens up the cmd and attempts to load a image for 1/2 second but its blank than crashes says program stopped responding. When i run it in debugger it prompts error
[CODE]First-chance exception at 0x00000000 in SDLLesson3.exe: 0xC0000005: Access violation.
Unhandled exception at 0x00000000 in SDLLesson3.exe: 0xC0000005: Access violation.
The program '[6288] SDLLesson3.exe: Native' has exited with code 0 (0x0).CODE]

[Amleto]

thats nearly no help whatsoever

If you have gone thourgh it in the debugger, then why dont you show us the line where it crashes?

you have probably got a pointer that is not pointing to an object, or the thing it points to has been deleted.

[fireXmist]

thats nearly no help whatsoever

If you have gone thourgh it in the debugger, then why dont you show us the line where it crashes?

you have probably got a pointer that is not pointing to an object, or the thing it points to has been deleted.

my bad line 25

   loadedImage = IMG_Load( filename.c_str() );

[Paul McKenzie]

my bad line 25

   loadedImage = IMG_Load( filename.c_str() );

What's in the file could be invalid or something the library doesn't expect, causing the crash.

Secondly the guy who came up with this sample should know to pass strings by const reference, not by value:

SDL_Surface *load_image( const std::string& filename )

Regards,

Paul McKenzie

[fireXmist]

the file is a png img, and shouldnt be unexpected. Also its part of Lazy Foo's tutorials for SDL which works for other people. Was thinking it was more something i did with compiler. I think he uses different complier than me and some code might be different because i have to change headers each tutorials from "SDL/SDL.h" to "SDL.h" and include the stdax.h for <string>.

When i run the program it does not give a error message but my windows says the program crashed. Does not crash with a message. Image below of how the crash looks like

[fireXmist]

And for more curious people this is how it looks when i go to debug

http://img691.imageshack.us/img691/56/debug.jpg

This is how the folder looks

http://img12.imageshack.us/img12/5031/folderxl.jpg

oh and didnt realize it but i accidently had library msvcrt ignored, but when i remove it off ignore this happens. Guessing this is where my problem is. But i installed exact things the tutorial said to.

MSVCRTD.lib(cinitexe.obj) : warning LNK4098: defaultlib 'msvcrt.lib' conflicts with use of other libs; use /NODEFAULTLIB:library

[Paul McKenzie]

And for more curious people this is how it looks when i go to debug

Then I think it's time for you to debug into the SDL library call itself and find out exactly what is the issue.

Is there source code to this library? If so, do you have a debug build of the DLL? If yes, then it should be no problem to debug into that call.

Regards,

Paul McKenzie

[fireXmist]

Thank you for your guys help. Got the problem solved now. Didnt know i had to put in pnb dll also.

[Paul McKenzie]

Thank you for your guys help. Got the problem solved now. Didnt know i had to put in pnb dll also.

Well, that isn't a well written library if it crashes your code due to a missing DLL.

Regards,

Paul McKenzie