你是否对C语言命令行黑框感到厌倦，今天来为你的C编程增加一些可视化窗口吧！

1、windows下安装C编译器

这对于一个开发者来说简直是太业余了，如果你是一个开发者，你的电脑上怎么会没有gcc呢，如果你是一个新手，可以转到这个链接：https://zhuanlan.zhihu.com/p/355510947。我们可以通过在命令行输入gcc来验证是否安装成功

PS C:\Users\13588\Desktop\SDL> gcc -v
Using built-in specs.
COLLECT_GCC=C:\mingw64\bin\gcc.exe
COLLECT_LTO_WRAPPER=C:/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/8.1.0/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: ../../../src/gcc-8.1.0/configure --host=x86_64-w64-mingw32 --build=x86_64-w64-mingw32 --
Thread model: win32
省略···
gcc version 8.1.0 (x86_64-win32-seh-rev0, Built by MinGW-W64 project)

2、下载SDL2

在这个网站下载SDL2，官网已经将下载链接迁移至github：https://github.com/libsdl-org/SDL/releases/tag/release-2.28.3 ，对于windows来说，将SDL2-devel-2.28.3-mingw.zip下载解压即可，我们只需要的文件夹为x86_64-w64-mingw32

3、新建工程

新建一个文件夹为SDL_test，将上一步中的x86_64-w64-mingw32重命名为SDL2放在根目录中，并且新建main.c文件，将SDL_test\SDL2\bin文件夹下的SDL2.dll移动到main.c同目录中，工程建立完毕后的目录结构为

PS C:\Users\13588\Desktop\SDL_test> ls


    目录: C:\Users\13588\Desktop\SDL_test


Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
d-----          2023/9/7     17:01                SDL2
-a----          2023/9/7     17:13           1055 main.c
-a----          2023/9/2      2:28        2499072 SDL2.dll

编辑main.c 实现一个最简单的画图显示demo，窗口在打开3S后自动关闭

#include "SDL.h"
#include <stdio.h>
#define POINTS_COUNT 4
static SDL_Point points[POINTS_COUNT] = {
    {320, 200},
    {300, 240},
    {340, 240},
    {320, 200}
};
static SDL_Rect bigrect = {0,0,540, 380};
int main(int argc, char* argv[]) {
    int flag = 1;
    SDL_Window *window;                    // Declare a pointer
    SDL_Renderer *renderer;
    SDL_Init(SDL_INIT_VIDEO);              // Initialize SDL2
    // Create an application window with the following settings:
    window = SDL_CreateWindow(
        "An SDL2 window",                  // window title
        SDL_WINDOWPOS_UNDEFINED,           // initial x position
        SDL_WINDOWPOS_UNDEFINED,           // initial y position
        640,                               // width, in pixels
        480,                               // height, in pixels
        SDL_WINDOW_SHOWN | SDL_WINDOW_BORDERLESS// flags - see below
    );
    // Check that the window was successfully created
    if (window == NULL) {
        // In the case that the window could not be made...
        printf("Could not create window: %s\n", SDL_GetError());
        return 1;
    }
    /* We must call SDL_CreateRenderer in order for draw calls to affect this window. */
    renderer = SDL_CreateRenderer(window, -1, 0);
    /* Select the color for drawing. It is set to red here. */
    SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
    /* Clear the entire screen to our selected color. */
    SDL_RenderClear(renderer);
    SDL_SetRenderDrawColor(renderer, 255, 255, 255, SDL_ALPHA_OPAQUE);
    //SDL_RenderDrawLine(renderer, 100, 20, 500, 400);
    SDL_RenderDrawLines(renderer, points, POINTS_COUNT);
    SDL_Rect rect = {200, 300, 100, 100};
    SDL_RenderDrawRect(renderer, &rect);
    SDL_SetRenderDrawColor(renderer, 0, 255, 255, 255);
    SDL_RenderFillRect(renderer, &rect);
    SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255);
    SDL_RenderFillRect(renderer, &bigrect);
    /* Up until now everything was drawn behind the scenes.
       This will show the new, red contents of the window. */
    SDL_RenderPresent(renderer);
    // The window is open: could enter program loop here (see SDL_PollEvent())
    SDL_Delay(3000);  // Pause execution for 3000 milliseconds, for example
    //destory renderer
    if (renderer) {
        SDL_DestroyRenderer(renderer);
    }
    // Close and destroy the window
    SDL_DestroyWindow(window);
    // Clean up
    SDL_Quit();
    return 0;
}

4、编译运行

在当前文件夹下使用gcc编译，传参中加入头文件固定地址和库文件地址

gcc ./main.c -I.\SDL2\include -L.\SDL2\lib -lmingw32 -lSDL2main -lSDL2

运行a.exe文件，桌面会显示一个彩色的窗口：
sdl.png

5、总结

整体来说SDL2的运行较为简单的，学会使用SDL后，就可以写出来一些带有界面的小程序，并且可以用来提前验证GUI程序，不用频繁的烧录到单片机

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