Question

我试图在OSX El Capitan上构建一个SDL2应用程序，而我遇到的问题是门窗没有出现。退出按钮和调整大小栏之类的东西没有出现。我在Windows上编译过，一切正常。

为了使它更容易，这个链接到Lazy Foo教程复制了这个问题：http://lazyfoo.net/tutorials/SDL/01_hello_SDL/index2.php

我的make文件很简单（我也在他的网站上偷了它）

COMPILER_FLAGS = -w

LINKER_FLAGS = -framework SDL2

#OBJS specifies which files to compile as part of the project
OBJS = main.c 
#CC specifies which compiler we're using
CC = g++

OBJ_NAME = main
#This is the target that compiles our executable
all : $(OBJS)
    $(CC) $(OBJS) $(INCLUDE_PATHS) $(LIBRARY_PATHS) $(COMPILER_FLAGS) $(LINKER_FLAGS) -o $(OBJ_NAME)

如果有人知道我做错了什么，我很想知道。

更新：我拿出了一台旧笔记本电脑，刚安装到El Capitan，基于Lazy Foo代码存在同样的问题。

更新：

/*This source code copyrighted by Lazy Foo' Productions (2004-2015)
and may not be redistributed without written permission.*/

//Using SDL and standard IO
#include <SDL.h>
#include <stdio.h>

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

int main( int argc, char* args[] )
{
    //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 )
    {
        printf( "SDL could not initialize! SDL_Error: %s\n", SDL_GetError() );
    }
    else
    {
        //Create window
        window = SDL_CreateWindow( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );
        if( window == NULL )
        {
            printf( "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 );

            //Wait two seconds
            SDL_Delay( 2000 );
        }
    }

    //Destroy window
    SDL_DestroyWindow( window );

    //Quit SDL subsystems
    SDL_Quit();

    return 0;
}

Answer 1

不确定根本原因，但制作一个轮询事件的循环似乎可以解决问题。

bool loop = true;
while(loop)
{
    SDL_Event event;
    while(SDL_PollEvent(&event))
    {
        if(event.type == SDL_QUIT)
        {
            loop = false;
        }
    }
}

SDL2窗口缺少窗口栏

1 个答案: