c - 我需要有关 SDL 2 的帮助

Question

运行我的 prog 时遇到问题:“prog.exe 刚刚停止工作”。

#include <SDL.h>
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char* argv[])
{
    SDL_Surface *screen; // even with SDL2, we can still bring ancient code back
    SDL_Window *window;
    SDL_Surface *image;

    SDL_Init(SDL_INIT_VIDEO); // init video

    // create the window like normal
    window = SDL_CreateWindow("SDL2 Example", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, 0);

    // but instead of creating a renderer, we can draw directly to the screen
    screen = SDL_GetWindowSurface(window);

    // let's just show some classic code for reference
    SDL_FillRect(image, NULL, SDL_MapRGB(image->format, 0, 255, 0));
    SDL_BlitSurface(image, NULL, screen, NULL); // blit it to the screen
    SDL_FreeSurface(image);

    // this works just like SDL_Flip() in SDL 1.2
    SDL_UpdateWindowSurface(window);

    // show image for 2 seconds
    SDL_Delay(2000);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 0;
}

// gcc src/main.c -o bin/prog -I include -L lib -lmingw32 -lSDL2main -lSDL2

Answer 1

作为尤金·Sh.指出您的表面未初始化

您需要以某种方式创建曲面，可以通过加载 IMG 或使用 SDL_CreateRGBSurface 。在调用 SDL_FillRect 之前添加此内容，现在您的代码将显示绿屏。

image = SDL_CreateRGBSurface(0, width, height, 32, 0, 0, 0, 0);