请问C# EnumChildWindows枚举子窗口句柄怎么用？

Question

请问C# EnumChildWindows枚举子窗口句柄怎么用法，点击按钮怎么获取全部子句柄数据？我不懂回调函数，请各位指教一下，谢谢！
下面是枚举子句柄的win32 API

using System.Runtime.InteropServices;

[DllImport("user32.dll")]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);//查找窗口句柄
[DllImport("User32.dll ")]
         public static extern IntPtr FindWindowEx(IntPtr parent, IntPtr childe, string strclass, string FrmText);//查找窗口中子窗口的句柄
[DllImport("user32.dll")]
        public static extern int EnumChildWindows(IntPtr hWndParent, CallBack lpEnumFunc, int lParam);//枚举子窗口句柄
        public delegate bool CallBack(IntPtr hwnd, int lParam);//回调函数声明，后续还要实现回调函数实体。

 private void button1_Click(object sender, EventArgs e)
        {
            IntPtr hwnd = FindWindow(null, "qq");
            IntPtr htextbox = FindWindowEx(hwnd, IntPtr.Zero, "小明", null);
            //Console.WriteLine(htextbox);
              
            int ecw=EnumChildWindows（12345,,）；//比如父句柄是12345，如何枚举输出全部子句柄
            //Console.WriteLine(ecw);
        }

Answer 1

https://blog.csdn.net/arebu/article/details/78519446