一个让窗口屏幕中心位置居中显示的C++函数

//窗口居中显示 ，hWnd参数为窗口句柄
void  setCenterShow(HWND hWnd){
    long scrWidth,scrHeight;
    RECT rect;
    scrWidth=GetSystemMetrics(SM_CXSCREEN);
    scrHeight=GetSystemMetrics(SM_CYSCREEN);
    GetWindowRect(hWnd,&rect);
    SetWindowPos(hWnd,HWND_TOPMOST,(scrWidth-rect.right)/2,(scrHeight-rect.bottom)/2,rect.right-rect.left,rect.bottom-rect.top,SWP_SHOWWINDOW);   
}