SDL 创建 window 不在 Mac os X 上创建 window

Question

我正在关注 SDL 上的 Lazy Foo tutorial。

当使用 SDL_WINDOW_SHOWN 和运行创建 window 时，菜单栏会出现，但 window 不会。需要一些指导来进一步调试它。

我也试过手动设置 window 位置，但没有成功。

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);

一切都编译成功并且SDL_GetError()没有产生任何错误。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;
}

Answer 1

它不起作用的原因是我没有设置事件循环。

我在 documentation on how to draw a line 那里得到了一个例子。

SDL_Event event;

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

SDL 创建 window 不在 Mac os X 上创建 window

SDL Create window not creating window on Mac os X

c

sdl