SDL2 - 試圖將表面信息複製到結構時崩潰。沒有錯誤信息

Question

#include <SDL.h> 
#include <SDL_image.h> 
#include <stdio.h> 

typedef struct{ 
    SDL_Texture *texture; // The image/sprite itself 
    int width;   // Sprite width 
    int height;   // Sprite height 
} Sprite; 

Sprite *createSprite(SDL_Renderer *r, char *path); 

int main(int argc, char *argv[]){ 
    // Initialise SDL and SDL_image 
    SDL_Init(SDL_INIT_VIDEO); 
    IMG_Init(IMG_INIT_PNG); 

    // Create window 
    SDL_Window *window = SDL_CreateWindow(
     "VN",     // Title 
     SDL_WINDOWPOS_CENTERED, // Initial x position 
     SDL_WINDOWPOS_CENTERED, // Initial y position 
     1280,     // Width 
     720,     // Height 
     0      // Flags 
    ); 

    if(window == NULL){ 
     printf("Failed to create window. %s\n", SDL_GetError()); 
     return 1; 
    } 

    // Create renderer 
    SDL_Renderer *renderer = SDL_CreateRenderer(
     window,      // Window 
     -1,       // Monitor index (-1 for first available) 
     SDL_RENDERER_ACCELERATED // Flags 
    ); 

    if(renderer == NULL){ 
     printf("Failed to create renderer. %s\n", SDL_GetError()); 
     return 1; 
    } 

    // Set up event handling 
    SDL_Event event; 

    while(1){ 
     // Handle events/input 
     while(SDL_PollEvent(&event) != 0){ 
      // Check if user wants to quit (press window close button) 
      if(event.type == SDL_QUIT){ 
       return 1; 
      } 
     } 

     // Set screen colour to white 
     SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0); 

     // Render white to screen (clear screen) 
     SDL_RenderClear(renderer); 

     // Update screen 
     SDL_RenderPresent(renderer); 
    } 

    // Exit SDL and SDL_image 
    SDL_Quit(); 
    IMG_Quit(); 
    return 0; 
} 

Sprite *createSprite(SDL_Renderer *r, char *path){ 
    printf("Entered createSprite()\n"); 

    // Create a Sprite structure, containing an image (texture) and its dimensions 
    Sprite *newSprite = NULL; 
    SDL_Texture *spriteTexture = NULL; 

    // Temporary surface (for loading texture) 
    SDL_Surface *tempSurface = NULL; 

    // Load image from path 
    tempSurface = IMG_Load(path); 
    if(tempSurface == NULL){ 
     printf("Failed to load image '%s'. %s\n", path, IMG_GetError()); 
    } else{ 
     spriteTexture = SDL_CreateTextureFromSurface(r, tempSurface); 
     if(spriteTexture == NULL){ 
      printf("Failed to create texture from '%s'. %s\n", path, SDL_GetError()); 
     } else{ 
      // Store texture, image width & height in Sprite structure 
      newSprite->texture = spriteTexture; 
      newSprite->width = tempSurface->w; 
      newSprite->height = tempSurface->h; 
     } 
    } 

    // Free memory of temp surface 
    SDL_FreeSurface(tempSurface); 

    printf("Leaving createSprite()\n"); 
    return newSprite; 
} 

我試圖加載一個圖像使用SDL_image插件，並將其寬度和高度存儲在一個結構（以及從表面創建的紋理）。

當試圖運行第93行上的newSprite->texture = spriteTexture;部分時，它崩潰。這是我所能提供的儘可能多的信息。有任何想法嗎？

我試圖使用SDL_image插件加載圖像，並將其寬度和高度存儲在結構中（以及從表面創建的紋理）。

Answer 1

問題是你沒有在你的createSprite函數中爲Sprite分配內存。您將其設置爲NULL，並嘗試訪問那個當然失敗的位置。

試試這個：

Sprite *createSprite(SDL_Renderer *r, char *path){ 
    printf("Entered createSprite()\n"); 

    // Create a Sprite structure, containing an image (texture) and its dimensions 
    Sprite *newSprite = new Sprite(); //<<- this is where you allocate the memory 
    SDL_Texture *spriteTexture = NULL; 

    // Temporary surface (for loading texture) 
    SDL_Surface *tempSurface = NULL; 

    // Load image from path 
    tempSurface = IMG_Load(path); 
    if(tempSurface == NULL){ 
     printf("Failed to load image '%s'. %s\n", path, IMG_GetError()); 
    } else{ 
     spriteTexture = SDL_CreateTextureFromSurface(r, tempSurface); 
     if(spriteTexture == NULL){ 
      printf("Failed to create texture from '%s'. %s\n", path, SDL_GetError()); 
     } else{ 
      // Store texture, image width & height in Sprite structure 
      newSprite->texture = spriteTexture; 
      newSprite->width = tempSurface->w; 
      newSprite->height = tempSurface->h; 
     } 
    } 

    // Free memory of temp surface 
    SDL_FreeSurface(tempSurface); 

    printf("Leaving createSprite()\n"); 
    return newSprite; 
}