I am getting an "Access violation reading location" error when running in release mode - C++ - c++

Question

I have tried looking all over the place for an answer but to no avail.
in debugger mode it worked fine but when i put it in release mode it give me this
Unhandled exception at 0x00DC1814 in sdl project.exe: 0xC0000005: Access violation reading location 0x00000000.
i have my debugger and release mode include and library the same, even my subsystems are the same. here is my code, i have shorten it by a bit
SDL_Surface *loadimage();
struct picture
{
int maxframe;
SDL_Surface *surface = NULL;
SDL_Rect rect;
std::string filepath;
};
SDL_Surface *background = NULL;
SDL_Surface *backbuffer = NULL;
SDL_Surface *holder = NULL;
std::vector<picture *> veck;
int main(int argc, char* argu[]){
background = SDL_LoadBMP("pics/bac.bmp");
if (background == NULL){
return false;
}
int height = background->h;
int width = background->w;
init_testprogram();
backbuffer = SDL_SetVideoMode(width, height, 32, SDL_SWSURFACE);
SDL_WM_SetCaption("Yamada's first window", NULL);
//this was here to test if i could format a surface more then once in
//the same format kept in just in case
holder = SDL_DisplayFormat(background);
background = SDL_DisplayFormat(holder);
SDL_FreeSurface(holder);
//this is where i get the error
veck[0]->surface = loadimage();
veck[0]->rect.w = veck[0]->surface->w;
veck[0]->rect.h = veck[0]->surface->h;
//if commented out this is where i get my second error
veck.push_back(new picture);
veck[1]->rect.x = 39;
veck[1]->rect.y = 49;
veck[1]->surface = veck[0]->surface;
veck[1]->rect.w = veck[0]->surface->w;
veck[1]->rect.h = veck[0]->surface->h;
veck[0]->rect.x = 500;
veck[0]->rect.y = 200;
//printing to screan
TTF_Font *font = NULL;
Mix_Chunk *sound = NULL;
picture *picture1;
//if commented out again this is where i get my third error in sound
sound = Mix_LoadWAV("sound/walking in grass.wav");
font = TTF_OpenFont("fonts/CaviarDreams.ttf", 100);
while (programisrunning()){
//do SDL stuff herre
}
SDL_Delay(3000);
SDL_Quit();
TTF_Quit();
Mix_CloseAudio();
int t;
std::cin >> t;
return 0;
}
/////definitions
SDL_Surface *loadimage(){
veck.push_back(new picture);
SDL_Surface* rawimage = NULL;
SDL_Surface* processedimage = NULL;
veck[0]->filepath = "pics/walk 3.png";
rawimage = IMG_Load(veck[0]->filepath.c_str());
if (rawimage == NULL){
errorreport("image 'walk 3.png' failed to load\n");
return false;
}
processedimage = SDL_DisplayFormat(rawimage);
SDL_FreeSurface(rawimage);
if (processedimage == NULL){
errorreport("image 'walk 3.png' failed to process\n");
return false;
}
Uint32 colorkey = SDL_MapRGB(processedimage->format, 255, 255, 255);
SDL_SetColorKey(processedimage, SDL_SRCCOLORKEY, colorkey);
// EDIt
if (processedimage == NULL)
errorreport("ERRRORORROROOR BUT WHY\n");
return processedimage;
}
i know its not in the best way of doing things but this is my test project for doing stuff in sdl. if i comment out the hole veck[0] thing then i get the same error but at further down in veck.pushback() and if i comment out all the vecks then i get the error at sound. i am using visual studio exress 2013 if that helps at all. i don't understand what i am doing wrong.
i did cut out stuff i thought was pointless to add here

Answer 1

You have undefined behavior in veck[0]->surface = loadimage(); since veck[0] won't get an object until loadimage() has executed.
There's no guarantee that loadimage() will be called before veck[0] is evaluated.