未显示 SDL 窗口

SDL Window Not Appearing

本文关键字：窗口 SDL 显示      更新时间：2023-10-16

我试图显示一个 SDL 窗口，但它似乎不起作用。程序将运行，显示窗口的功能将运行，没有错误，但屏幕上没有任何显示。我在扩展坞中只有一个图标，表示程序没有响应。这是我的代码： 

int main(int argc, const char * argv[]) {
    MainComponent mainComponent;
    mainComponent.init();
    char myVar;
    cout << "Enter any key to quit...";
    cin >> myVar;
    return 0;
}
void MainComponent::init() {
    //Initialize SDL
    SDL_Init(SDL_INIT_EVERYTHING);
    window = SDL_CreateWindow("My Game Window", 100, 100, 100, 100, SDL_WINDOW_SHOWN);
    cout << screenWidth << " " << screenHeight << endl;
    if(window == nullptr) {
        cout << "Error could not create window" << SDL_GetError() << endl;
    }
    SDL_Delay(5000);
}

这是停靠 https://www.dropbox.com/s/vc01iqp0z07zs25/Screenshot%202016-02-02%2017.26.44.png?dl=0 上图标的屏幕截图如果我做错了什么，请告诉我，谢谢！

应该

初始化SDL_Renderer来处理渲染。此处对此进行了详细说明 什么是 SDL 渲染器？。

这是上面带有初始化渲染器的修改代码;

#include <SDL2/SDL.h>
#include <iostream>
using namespace std;
class MainComponent
{
 public:
    void init();
    ~MainComponent();
 private:
    SDL_Window *window;
    SDL_Renderer* renderer;
};
MainComponent::~MainComponent()
{
  SDL_DestroyRenderer(renderer);
  SDL_DestroyWindow(window);
}
void MainComponent::init() {
    //Initialize SDL
    SDL_Init(SDL_INIT_EVERYTHING);
    int screenWidth = 400;
    int screenHeight = 300;
    window = SDL_CreateWindow("My Game Window", 100, 100, screenWidth, screenHeight, SDL_WINDOW_SHOWN);
    renderer = SDL_CreateRenderer(window, -1, 0);
    cout << screenWidth << " " << screenHeight << endl;
    if(window == nullptr) {
        cout << "Error could not create window" << SDL_GetError() << endl;
    }
    //change the background color
    SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
    // Clear the entire screen to our selected color.
    SDL_RenderClear(renderer);
    // Up until now everything was drawn behind the scenes.
    // This will show the new, red contents of the window.
    SDL_RenderPresent(renderer);

    SDL_Delay(5000);
}

int main(int argc, const char * argv[]) {
    MainComponent mainComponent;
    mainComponent.init();
    char myVar;
    cout << "Enter any key to quit...";
    cin >> myVar;
    SDL_Quit();
    return 0;
}

这应该可以正确编译和运行。希望有帮助。

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