c++ - SDL2 CreateRenderer 抛出无效窗口错误

Question

我目前的代码如下:

#include <iostream>
#include "SDL.h"
#include "SDL_image.h"

int main(int argc, char **argv) {
    if (SDL_Init(SDL_INIT_EVERYTHING != 0)) {
        std::cout << "SDL_Init() Error: " << SDL_GetError() << std::endl;
        std::cin.get();
        return 1;
    }

    SDL_Window *win = SDL_CreateWindow("RandomSDL2", 100, 100, 1280, 720, SDL_WINDOW_SHOWN);
    if (win = nullptr) {
        std::cout << "SDL_CreateWindow() Error: " << SDL_GetError() << std::endl;
        std::cin.get();
        return 1;
    }

    SDL_Renderer *ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
    if (ren == nullptr) {
        std::cout << "SDL_CreateRenderer() Error: " << SDL_GetError() << std::endl;
        std::cin.get();
        return 1;
    }

    SDL_Surface *img = IMG_Load("res/test.png");
    if (img == nullptr) {
        std::cout << "IMG_Load() Error: " << IMG_GetError() << std::endl;
        std::cin.get();
        return 1;
    }

    SDL_Texture *tex = SDL_CreateTextureFromSurface(ren, img);
    SDL_FreeSurface(img);
    if (tex == nullptr) {
        std::cout << "SDL_CreateTextureFromSurface() Error: " << SDL_GetError << std::endl;
        std::cin.get();
    }

    SDL_RenderClear(ren);
    SDL_RenderCopy(ren, tex, NULL, NULL);
    SDL_RenderPresent(ren);

    SDL_Delay(2000);

    SDL_DestroyTexture(tex);
    SDL_DestroyRenderer(ren);
    SDL_DestroyWindow(win);

    SDL_Quit();

    return 0;
}

似乎 CreateRenderer 函数抛出无效窗口错误，我不确定为什么，我目前正在关注 this教程，除了分辨率和 SDL_image 的使用之外，我已经将代码复制到 T，SDL_image 不应该真正影响这个阶段渲染器的创建，我也尝试了教程中指定的分辨率，看起来仍然会抛出相同的错误。

有没有人对这个问题有任何见解？

Answer 1

if (win = nullptr) {
        ^ assignment, probably wanted ==

不要将 win 设置为 nullptr，它可能不会是 nullptr。