关于#c++#的问题：运用C++全屏代码

运用C++全屏代码但没有全屏
代码：

#include<windows.h>
#include<iostream>
void FullScreen(HWND hwnd) {
    LONG_PTR last_style=GetWindowLongPtr(hwnd,GWL_STYLE);
    RECT last_rect;
    GetWindowRect(hwnd,&last_rect);
    int screen_width=GetSystemMetrics(SM_CXSCREEN);
    int screen_height=GetSystemMetrics(SM_CYSCREEN);
    SetWindowLongPtr(hwnd,GWL_STYLE,(WS_VISIBLE|WS_POPUP));
    SetWindowPos(hwnd,NULL,0,0,screen_width,screen_height,SWP_FRAMECHANGED);
    UpdateWindow(hwnd);
}
int main() {
    HWND hwnd=GetConsoleWindow();
    FullScreen(hwnd);
    system("pause");
    return 0;
}

结果：