c - 程序获取 EXC_BAD_ACCESS

Question

编译没问题，但是程序在这个函数中停止了。我有 win 版本并且功能正常，但是当我为 Mac 制作版本时，它出现此异常:(

 int Reconstruct(int rez){ //here is program stopped!!!!
static SDL_Surface *projekce; static SDL_Surface *sc;  static SDL_Surface *rek;
projekce = SDL_CreateRGBSurface(SDL_SWSURFACE,240,240, 32,0,0,0,0); sc = SDL_CreateRGBSurface(SDL_SWSURFACE, 400, 400, 32, 0, 0, 0, 0); // Create two arrays of unsigned bytes (chars). 4 bytes per pixel (RGBA) unsigned char *pixels[400 * 400 * 4]; unsigned char *pixelsbuf[400 * 400 * 4];
glGenTextures(1, &gl_texture);// generate one texture glBindTexture(GL_TEXTURE_2D, gl_texture);// Set the texture
// Set the texture filters glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);    
int angle = 0; int snimek = 0; int i, j, k, l;// promene pro cykly
for(i=0;i<88;i++) {  
char nazev[25] = "OUT/snimek";  itoa(snimek, CisloSnimku);  strcat(nazev,CisloSnimku);  strcat(nazev,".bmp");  rek = IMG_Load(nazev);  snimek++; 
SDL_LockSurface(rek);  SDL_LockSurface(projekce); 
//zkopiruj radek do snimku = vytvor snimek pro rotaci 
for(j=0;j<240;j++)  {   if(j == 0) PixV1 = 0;   else   {    PixV1 = getpixel(rek,j-1,rez);   }   if(j == 239) PixV3 = 0;   else   {    PixV3 = getpixel(rek,j+1,rez);   }   PixV2 = getpixel(rek,j,rez);
SDL_GetRGB(PixV1,rek->format, &R, &G, &B);   //Gs1 = ((R * 21) + (G * 61) + (B * 174)) / 256;  //preved do grayscale pro blue   Gs1 = ((R * 11) + (G * 174) + (B * 71)) / 256;  //preved do grayscale pro green   Gs1 = 255 - Gs1;                        //invert   if (Gs1 < 50) Gs1 = 1;   SDL_GetRGB(PixV2,rek->format, &R, &G, &B);   //Gs2 = ((R * 21) + (G * 61) + (B * 174)) / 256;  //preved do grayscale pro blue   Gs2 = ((R * 11) + (G * 174) + (B * 71)) / 256;  //preved do grayscale pro green   Gs2 = 255 - Gs2;                                //invert   if (Gs2 < 50) Gs2 = 1;   SDL_GetRGB(PixV3,rek->format, &R, &G, &B);   //Gs3 = ((R * 21) + (G * 61) + (B * 174)) / 256;  //preved do grayscale pro blue   Gs3 = ((R * 11) + (G * 174) + (B * 71)) / 256;  //preved do grayscale pro green   Gs3 = 255 - Gs3;                                //invert   if (Gs3 < 50) Gs3 = 1;   //Gs = (Gs1*(1)) + (Gs2*(-4)) + (Gs3*(1)); //convolution GOOD   //Gs = (Gs1*(-1)) + (Gs2*(3)) + (Gs3*(-1)); //convolution 
for(k=0;k<240;k++)   {    DrawPixel(projekce, j, k, Gs2, Gs2, Gs2);   }  }
SDL_UnlockSurface(rek);  SDL_UnlockSurface(projekce);   
gluBuild2DMipmaps(GL_TEXTURE_2D, 3, projekce->w, projekce->h, GL_RGBA, GL_UNSIGNED_BYTE, projekce->pixels);
  angle += 360/88;
  Atlantis_Display(angle); 
////////////////////////////////////////////////////////////////////////////
glReadPixels(0, 0, 400, 400, GL_RGBA, GL_UNSIGNED_BYTE, pixelsbuf);
////////////////////////////////////////////////////////////////////////////
SDL_LockSurface(sc);  SDL_LockSurface(final);
G1 = 0;  G = 0;  R = 0;  B = 0;
for(l=0;l<400;l++)  {   memcpy(pixels+(400-l-1)*400*4, pixelsbuf+l*400*4, 400*4);   sc->pixels = pixels;
for(j=0;j<400;j++)   {
            PixelValue = getpixel(sc, j, l);
            SDL_GetRGB(PixelValue, sc->format, &R, &G, &B);
            PixelValue = getpixel(final, j, l);
            SDL_GetRGB(PixelValue, final->format, &R1, &G1, &B1);

            //pom = ((R/2)+(B/2)+(G*2));

            G1 += (G/90);

            DrawPixel(final, j, l, G1, G1, G1);

} }

SDL_UnlockSurface(sc);

}

char fin[25] = "FIN/最终"; itoa(rez, CisloSnimku); strcat(fin,CisloSnimku); strcat(fin,".bmp"); SDL_SaveBMP(最终, fin); SDL_UnlockSurface(最终)；

SDL_FreeSurface(最终)； SDL_FreeSurface(sc); SDL_FreeSurface(项目)； SDL_FreeSurface(rek); SDL_Quit(); 返回0；}

Answer 1

以下代码非常可疑:

 unsigned char *pixels[400 * 400 * 4];
 unsigned char *pixelsbuf[400 * 400 * 4];

一方面，这些可能应该是 char 而不是 char *，但更大的问题是您在堆栈上分配巨大的数据结构(每个数组 2.5 MB，如所写)。我猜你已经超出了你的可用堆栈。相反，它们应该动态分配(并正确调整大小)。