Question

我正在遵循SDL上的Lazy Foo tutorial。

使用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);创建一个窗口并运行二进制文件时，菜单栏出现，但窗口没有。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，但是没有运气。

SDL_GetError()

一切都编译成功，#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; }不会产生任何错误。我登录到文件进行确认。

boolean flag = True
for(int i = 1; i < 20 && flag; i *= 2) {
    //Code in here
}

Answer 1

它不起作用的原因是因为我没有设置事件循环。

我是documentation on how to draw a line，在那里有一个例子。

SDL_Event event;

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

SDL创建窗口未在Mac OS X上创建窗口

1 个答案: