我在发布模式下运行时收到"Access violation reading location"错误 - C++



我试图到处寻找答案,但无济于事。 在调试器模式下,它工作正常,但是当我将其置于发布模式时,它给了我这个

在 sdl 项目中0x00DC1814时未处理的异常.exe: 0xC0000005:访问冲突读取位置0x00000000。

我的调试器和发布模式包含和库相同,甚至我的子系统也相同。 这是我的代码,我将其缩短了一点

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;
}

/////定义

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 loadn");
return false;
}
processedimage = SDL_DisplayFormat(rawimage);
SDL_FreeSurface(rawimage);
if (processedimage == NULL){
errorreport("image 'walk 3.png' failed to processn");
return false;
}
Uint32 colorkey = SDL_MapRGB(processedimage->format, 255, 255, 255);
SDL_SetColorKey(processedimage, SDL_SRCCOLORKEY, colorkey);
// EDIt
if (processedimage == NULL)
errorreport("ERRRORORROROOR BUT WHYn");

return processedimage;
}

我知道这不是最好的做事方式,但这是我在 SDL 中做事的测试项目。 如果我注释掉孔 veck[0] 的东西,那么我会收到同样的错误,但在 veck.pushback(( 的更下方,如果我注释掉所有 veck,那么我会在 sound 上得到错误。 我正在使用Visual Studio Exress 2013,如果这有帮助的话。 我不明白我我做错了。

我确实删掉了我认为在这里添加毫无意义的东西

您在veck[0]->surface = loadimage();中有未定义的行为,因为veck[0]在执行loadimage()之前不会获取对象。

无法保证在评估veck[0]之前会调用loadimage()

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