SDL创建窗口未在Mac OS X上创建窗口

肖恩·奥洛克

我正在关注有关SDLLazy Foo教程

在使用SDL_WINDOW_SHOWN二进制文件创建窗口并运行二进制文件时,将显示菜单栏,但窗口不显示。我需要一些指导以进一步调试它。

我也尝试过手动设置窗口位置,但没有运气。

SDL_CreateWindow("SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
                                  SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);

SDL_CreateWindow("SDL Tutorial", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
                                  SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);

SDL_CreateWindow("SDL Tutorial", 100, 100, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);

一切都可以成功编译,SDL_GetError()并且不会产生任何错误。我登录到文件进行确认。

#include <SDL2/SDL.h>
#include <stdio.h>

//Screen dimension constants
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;

int main(int argc, const char * argv[]) {
    FILE *log_file;
    log_file = fopen("log.log", "a+");
    
    //The window we'll be rendering to
    SDL_Window* window = NULL;
    
    //The surface contained by the window
    SDL_Surface* screenSurface = NULL;

    //Initialize SDL
    if (SDL_Init(SDL_INIT_VIDEO) < 0 )
    {
        fprintf(log_file, "SDL could not initialize! SDL_Error: %s\n", SDL_GetError());
    }
    else
    {
        //Create window
        window = SDL_CreateWindow("SDL Tutorial", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
                                  SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
        
        if (window == NULL)
        {
            fprintf(log_file, "Window could not be created! SDL_Error: %s\n", SDL_GetError());
        }
        else
        {
            //Get window surface
            screenSurface = SDL_GetWindowSurface(window);

            //Fill the surface white
            SDL_FillRect(screenSurface, NULL, SDL_MapRGB(screenSurface->format, 0xFF, 0xFF, 0xFF));
            
            //Update the surface
            SDL_UpdateWindowSurface(window);
            
             fprintf(log_file, "SDL_Error: %s\n", SDL_GetError());

            //Wait two seconds
            SDL_Delay(2000);
        }
    }
    
    //Destroy window
    SDL_DestroyWindow(window);

    //Quit SDL subsystems
    SDL_Quit();
    
    return 0;
}

肖恩·奥洛克

它不起作用的原因是因为我没有设置事件循环。

我在有关如何画线文档中找到了示例。

SDL_Event event;

while (SDL_PollEvent(&event)) {
  if (event.type == SDL_QUIT) {
    done = SDL_TRUE;
  }
}

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