Question

我正在使用SDL2和C ++（使用g ++编译并使用valgrind来调试某些东西），现在我使用包装类为渲染器，Windows等设置析构函数和构造函数。我的程序是故意崩溃和段错误，但有时只是。它大部分时间都没有，但很可能是由于未初始化的变量。这是valgrind所说的：

==227== Conditional jump or move depends on uninitialised value(s)
==227==    at 0xEA89BF2: ??? (in /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so)
==227==    by 0xEA89CB3: ??? (in /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so)
==227==    by 0x4E9A920: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.4.0)
==227==    by 0x4E9A978: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.4.0)
==227==    by 0x4E9BA62: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.4.0)
==227==    by 0x4E8FE12: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.4.0)
==227==    by 0x4032E9: game::Renderer::init() (Renderer.cpp:13)
==227==    by 0x4033CA: game::Renderer::Renderer(SDL_Window*&) (Renderer.cpp:31)
==227==    by 0x401AA2: game::Environment::Environment() (Environment.cpp:11)
==227==    by 0x4015D0: main (source.cpp:15)
==227==  Uninitialised value was created by a stack allocation
==227==    at 0x4E9A7A0: ??? (in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0.4.0)

这里的渲染器功能有问题：

namespace game {
        //init function that sets up the renderer. It is basically so all of my constructors don't use the same
        //code.
        void Renderer::init() {
                if (window != NULL) {
                        theRenderer = SDL_CreateRenderer(window, -1, 
SDL_RENDERER_ACCELERATED);
                        if (theRenderer == NULL) {
                                cout << "Renderer could not be created: " << 
SDL_GetError() << endl;
                        }
                        else {
                                SDL_SetRenderDrawColor (theRenderer, 0xFF, 0xFF, 0xFF, 0xFF);
                        }
                }
        }

        //parameterized constructor that takes a reference to an SDL_Window pointer
        //and sets up the renderer for that window
        Renderer::Renderer(SDL_Window*& initWindow): theRenderer(NULL), window(initWindow) {
                this->init();
        }


}

应该初始化它的窗口构造函数：

namespace game {

//Default constructor that sets up the window to be rendered to
Window::Window(): theWindow(NULL) {
        if (SDL_Init(SDL_INIT_VIDEO) < 0) {
                cout << "SDL could not initialize! SDL_Error: " << SDL_GetError() << endl;
        }
        else {
                this->theWindow = SDL_CreateWindow("Platformer", SDL_WINDOWPOS_UNDEFINED,
                  SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
                if(theWindow == NULL) {
                        cout << "Window could not be created! SDL_Error: "
                                << SDL_GetError() << endl;
                }
        }
}



}

我已经四处搜索，但无法找到与此特定错误相关的任何内容。有谁看到我未初始化的变量在哪里？

使用SDL2包装类的未定义行为（不可实现的段错误）

0 个答案: