SDL测试编译期间出错

Error during compilation of SDL test

本文关键字：出错 编译 测试 SDL      更新时间：2023-10-16

我正在学习用SDL2编程。目前，我正在做一个基本的练习。我的程序加载一个背景图像，并在背景上加载一个完整的精灵表。但我在执行程序时遇到了问题。当我执行二进制文件时，程序窗口会立即自行关闭；我什么也看不见。我认为这是主循环的问题，但它看起来对我来说是正确的。这是我的代码

#include "SDL.h"

void main () {
int gameover = 0;

SDL_Init(SDL_INIT_VIDEO);
SDL_Window* TheWindow;
SDL_Renderer* RenderEngine;
SDL_Surface* LoadedSurface;
SDL_Surface* LoadedImage;
SDL_Texture* CharacterImg;
SDL_Texture* BackgroundImg;
TheWindow = SDL_CreateWindow("Character Test",
    SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 580, SDL_WINDOW_RESIZABLE);
RenderEngine = SDL_CreateRenderer( TheWindow, -1, SDL_RENDERER_ACCELERATED);
LoadedSurface= SDL_LoadBMP("./maptest.bmp");
BackgroundImg = SDL_CreateTextureFromSurface( RenderEngine, LoadedSurface);
SDL_FreeSurface(LoadedSurface);
LoadedImage = SDL_LoadBMP("./sprite.bmp");
CharacterImg = SDL_CreateTextureFromSurface( RenderEngine, LoadedImage);
SDL_FreeSurface(LoadedImage);

SDL_Event event;
 while (!gameover)
{
  if (SDL_PollEvent(&event)) {
  switch (event.type) {
        case SDL_QUIT:
         gameover = 1;
        break;
        case SDL_KEYDOWN:
        switch (event.key.keysym.sym) {
        case SDLK_ESCAPE:
        case SDLK_q:
         gameover = 1;
                break;
            }   
         }
      break;
      }
    SDL_RenderClear(RenderEngine);
    SDL_RenderCopy(RenderEngine, BackgroundImg, NULL, NULL);
    SDL_RenderCopy(RenderEngine, CharacterImg, 120, 80);
    SDL_RenderPresent(RenderEngine);

   }

    SDL_Quit();

}

如果发生任何SDL_PollEvent，您的代码将退出while-循环：

while (!gameover)
  {
    if (SDL_PollEvent(&event)) //Any SDL_PollEvent that gets into if...
      {
        switch (event.type)
          {     
          case SDL_QUIT:
            gameover = 1;
            break;
          case SDL_KEYDOWN:
            switch (event.key.keysym.sym)
              {
              case SDLK_ESCAPE:
              case SDLK_q:
                gameover = 1;
                break;
              }   
          }
        break;     //...will eventually hit this break if it didn't break before
      }
    SDL_RenderClear(RenderEngine);
    SDL_RenderCopy(RenderEngine, BackgroundImg, NULL, NULL);
    SDL_RenderCopy(RenderEngine, CharacterImg, 120, 80);
    SDL_RenderPresent(RenderEngine); 
  }
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