SDL_GetWindowPosition（）不会更新int指针

Question

我正在尝试遵循youtube上的教程来学习SDL。但是当我尝试使用SDL_GetWindowPosition（）和SDL_GetWindowSize（）时，似乎并没有更新int *。

这是我的代码：

#include <iostream>
#include "include/SDL2/SDL.h"

using namespace std;

void CreateWindow(SDL_Window *win){
    win = SDL_CreateWindow("Title",
                           SDL_WINDOWPOS_UNDEFINED,
                           SDL_WINDOWPOS_UNDEFINED,
                           800, 600,
                           SDL_WINDOW_RESIZABLE);

    if (win == nullptr)
        cout<<"Could not create window.\n"<<SDL_GetError()<<'\n';
}

void QuitWindow(SDL_Window *win){
//    SDL_Delay(3000); // 3 seconds
    SDL_DestroyWindow(win);
    SDL_Quit();
}

int main(int argc, char* argv[]) {
    // initialize window
    SDL_Init( SDL_INIT_EVERYTHING );
    SDL_Window *win = nullptr;
    CreateWindow(win);


    // main loop
    SDL_Event event;
    bool run = true;
    while (run){
        int x, y, w, h;
        while (SDL_PollEvent(&event)){
            if (event.type == SDL_QUIT){
                run = false;
                QuitWindow(win);
                break;
            }
        }

        SDL_GetWindowPosition(win, &x, &y);
        SDL_GetWindowSize(win, &w, &h);
        cout<<x<<','<<y<<" ; "<<w<<','<<h<<endl;

    }

    return 0;
}

cout的结果类似于： 1048591,1872715060; 1,1965549662

我试图删除主循环，仅创建窗口-> getwindowposition-> getwindowsize->退出。但是仍然得到类似的结果。我该如何解决这个问题？