C#EnumChildWindows无法枚举所有子窗口的解决方法

            string WinClassName = "Itasca2Manager";
            IntPtr myIntPtr = FindWindow(WinClassName, null);
            Console.WriteLine("主窗体的句柄为：" + myIntPtr.ToInt32());
            bool S = EnumChildWindows(myIntPtr, callback, IntPtr.Zero);
            for (int i = 0; i < listWnd.Count; i++)
            {
                Console.WriteLine("第{0}子窗口的句柄为{1}",i+1, listWnd[i]);
            }