C++ 如何检查opencv窗口是否已经存在

我想知道opencv窗口是否已经存在。一个可能的解决办法是

std::string winName = "winName";
cv::namedWindow(winName);
HWND* hwnd = (HWND*)(cvGetWindowHandle(winName.c_str()));
if(hwnd == nullptr)
{
    std::cout<<"\n window handle hwnd is null \n";
}
else
{
    std::cout<<"\n window handle hwnd is not null \n";
}

cv::destroyAllWindows();
hwnd = (HWND*)(cvGetWindowHandle(winName.c_str()));
if(hwnd == nullptr)
{
    std::cout<<"\n window handle hwnd is null \n";
}
else
{
    std::cout<<"\n window handle hwnd is not null \n";
} 

std:：string winName=“winName”；
cv：：namedWindow（winName）；
HWND*HWND=（HWND*）（cvGetWindowHandle（winName.c_str（））；
if（hwnd==nullptr）
{
std：：你是想写
存在
还是
退出
？对不起，我纠正了我的错误。我想写存在。@DavidGrayson