C++ 错误：渲染器已与窗口关联

我正在尝试设置SDL项目，但收到以下错误消息：

Renderer already associated with window

从以下功能：

void Game::render()
    {
        renderer = SDL_CreateRenderer(window, -1, 0);
        if (renderer == NULL)
            std::cout << "Failed to create a renderer" << '\n' << "Error: " << SDL_GetError() << std::endl;
    }

game.cpp:

    #include "game.h"
    
    bool Game::init()
    {
        if (SDL_Init(SDL_INIT_EVERYTHING) != 0)
            return true;
        else
            std::cout << "Could not initialise SDL" << '\n' << "Error: " << SDL_GetError() << std::endl;
    }
    
    bool Game::constructWindow(const char* windowName, uint16_t xWindowPos, uint16_t yWindowPos
        , uint16_t windowWidth, uint16_t windowHeight, bool fullScreen)
    {
        window = SDL_CreateWindow(windowName, xWindowPos, yWindowPos, windowWidth, windowHeight, fullScreen);
        if (!window)
            std::cout << "Could not create window" << '\n' << "Error: " << SDL_GetError() << std::endl;
    
        return window;
    }
    
    void Game::render()
    {
        renderer = SDL_CreateRenderer(window, -1, 0);
        if (!renderer)
            std::cout << "Failed to create a renderer" << '\n' << "Error: " << SDL_GetError() << std::endl;
    }
    
    void Game::update()
    {
        SDL_RenderPresent(renderer);
    }
    
    SDL_Window* Game::getWindow()
    {
        return window;
    }
    
    bool Game::handleEvents()
    {
        while (SDL_PollEvent(&event))
            if (event.type == SDL_QUIT)
                quit = true;
        return quit;
    }

---

在

while

循环中调用

app.render（）

（创建渲染器，尽管名称有误导性）绝对不是“一次创建渲染器”。您可能应该在

constructWindow

中创建渲染器，然后在

render

中进行实际渲染。哦，对不起，我没有注意到这一点。它现在可以工作了，thanksI按照您的建议做了，将函数的名称更改为

ConstructionWindowandRender

，并只留下

render

函数来实际绘制内容。

    #include "game.h"
    
    bool Game::init()
    {
        if (SDL_Init(SDL_INIT_EVERYTHING) != 0)
            return true;
        else
            std::cout << "Could not initialise SDL" << '\n' << "Error: " << SDL_GetError() << std::endl;
    }
    
    bool Game::constructWindow(const char* windowName, uint16_t xWindowPos, uint16_t yWindowPos
        , uint16_t windowWidth, uint16_t windowHeight, bool fullScreen)
    {
        window = SDL_CreateWindow(windowName, xWindowPos, yWindowPos, windowWidth, windowHeight, fullScreen);
        if (!window)
            std::cout << "Could not create window" << '\n' << "Error: " << SDL_GetError() << std::endl;
    
        return window;
    }
    
    void Game::render()
    {
        renderer = SDL_CreateRenderer(window, -1, 0);
        if (!renderer)
            std::cout << "Failed to create a renderer" << '\n' << "Error: " << SDL_GetError() << std::endl;
    }
    
    void Game::update()
    {
        SDL_RenderPresent(renderer);
    }
    
    SDL_Window* Game::getWindow()
    {
        return window;
    }
    
    bool Game::handleEvents()
    {
        while (SDL_PollEvent(&event))
            if (event.type == SDL_QUIT)
                quit = true;
        return quit;
    }

#include "game.h"

int main(int argc, char* argv[])
{
    Game app;
    if (app.init())
        if (app.constructWindow("3D Engine", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1200, 600))
            while (!app.handleEvents())
            {
                app.render();
                app.update();
            }

    SDL_DestroyWindow(app.getWindow());
    SDL_Quit();

    return EXIT_SUCCESS;

}