SDL窗口不显示 [英] SDL window does not show

问题描述

这是我的代码：

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

int main(int argc, const char * argv[]) {

SDL_Init(SDL_INIT_VIDEO);

SDL_Window *_window;
_window = SDL_CreateWindow("Game Engine", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 700, 500, SDL_WINDOW_RESIZABLE);

SDL_Delay(20000);

SDL_DestroyWindow(_window);
SDL_Quit();

return 0;

}

我已经下载了SDL2并将库导入到项目构建阶段。我测试了SDL2工作正常。

Im working in Xcode. I've downloaded SDL2 and imported the library to the projects build phases. I've tested that the SDL2 works correctly.

问题是窗口从不显示。我只是得到一个spin-mac-wheel，然后程序退出延迟后。

The problem is that window never shows up. I just get a "spinning-mac-wheel" and then the program quits after the delay. I've made sure that the window is not hidden behind somewhere.

想法？

推荐答案

您必须加载位图图像或在窗口上显示某些内容，以便Xcode开始显示窗口。

You have to load a bitmap image, or display something on the window, for Xcode to start displaying the window.

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

using namespace std;

int main() {
    SDL_Window * window = nullptr;

    SDL_Surface * window_surface = nullptr;
    SDL_Surface * image_surface = nullptr;

    SDL_Init(SDL_INIT_VIDEO);

    window = SDL_CreateWindow("Window", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_SHOWN);

    window_surface = SDL_GetWindowSurface(window);
    image_surface = SDL_LoadBMP("image.bmp");

    SDL_BlitSurface(image_surface, NULL, window_surface, NULL);

    SDL_UpdateWindowSurface(window);

    SDL_Delay(5000);

    SDL_DestroyWindow(window);
    SDL_FreeSurface(image_surface);
    SDL_Quit();
}

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