使用Raylib绘制对象数组时出现Segmentation Fault问题排查

我自定义了Object结构体，通过CreateObjects函数初始化创建带指定属性的对象数组，目的是把多个共用同一纹理的对象绘制到屏幕不同坐标。之前有过类似实现经验，这次逻辑几乎一致，但DrawObjects的绘制循环里一直触发Segmentation Fault。

相关代码 #

object.c #

#include <malloc.h>
#include <stdio.h>
#include "raylib/include/raylib.h"
#include "object.h"

Object* CreateObjects(Texture2D texture, int numberOfObjects, int width, int height, double Xpos[], double Ypos[]){

        Object* objects = malloc(sizeof(Object) * numberOfObjects);

        for(int i=0; i < numberOfObjects; i++){
                objects[i].texture = texture;
                objects[i].rect.width = width;
                objects[i].rect.height = height;
                objects[i].rect.x = 0;
                objects[i].rect.y = 0;
                objects[i].position.x = Xpos[i];
                objects[i].position.y = Ypos[i];
        }
}

void DrawObjects(Object* objects, int numberOfObjects){

        for(int i=0; i < numberOfObjects; i++){
        DrawTextureRec(objects[i].texture, objects[i].rect, objects[i].position, WHITE);

        }
}

test.c 初始化代码 #

double objXPos[1] = {600-32};
double objYPos[1] = {900-64};
Texture2D barrelTexture = LoadTexture("sprites/barrel.png");
Object* barrels = CreateObjects(barrelTexture, 1, 64, 64, objXPos, objYPos);

test.c 绘制代码 #

BeginDrawing();
ClearBackground(BLACK);
DrawTexture(background, 0, 0, RAYWHITE);
DrawEntity(entity);
DrawObjects(barrels, 1);

if(bullet->isActive){
        DrawBullet(bullet);
        UpdateBullet(bullet);
        CheckEntityCollision(bullet, entity);
}

EndDrawing();

（注：DrawBullet和DrawEntity函数工作正常，问题大概率出在DrawObjects的循环部分）

问题分析与修复 #

核心问题 #

CreateObjects函数遗漏了返回语句！函数内用malloc分配了对象数组的内存，但最后没有return objects;，导致test.c中barrels变量拿到的是一个随机的无效地址。在DrawObjects中访问这个无效地址，直接触发Segmentation Fault。

修复后的CreateObjects函数 #

Object* CreateObjects(Texture2D texture, int numberOfObjects, int width, int height, double Xpos[], double Ypos[]){

        Object* objects = malloc(sizeof(Object) * numberOfObjects);
        // 可选：添加malloc失败的判断
        if (!objects) {
            fprintf(stderr, "malloc failed to allocate objects\n");
            return NULL;
        }

        for(int i=0; i < numberOfObjects; i++){
                objects[i].texture = texture;
                objects[i].rect.width = width;
                objects[i].rect.height = height;
                objects[i].rect.x = 0;
                objects[i].rect.y = 0;
                objects[i].position.x = Xpos[i];
                objects[i].position.y = Ypos[i];
        }
        // 添加返回语句
        return objects;
}

额外注意事项 #

• 程序结束时记得调用free(barrels)释放内存，避免内存泄漏
• 若添加了malloc失败判断，在调用CreateObjects后要检查返回值是否为NULL，避免后续操作空指针

内容的提问来源于stack exchange，提问作者d1zyz