private void button1_Click(object sender, EventArgs e)

        {

            //获取被测试程序的窗口句柄

            IntPtr mainWnd = FindWindow(null, "testform1");

            List<int> listName = new List<int>();



StringBuilder name = new StringBuilder(256);

 

EnumChildWindows(mainWnd, new CallBack(delegate(IntPtr hwnd, int lParam)

            {

                listWnd.Add(hwnd);



                //  listName.Add(GetWindowText(handle, stringBuilder, stringBuilder.Capacity));



                

                int a=GetWindowText(hwnd, name, 256);                                     

                listName.Add(a);

               

                return true;

            }), 0);

 foreach (IntPtr i in listName)

            {

                string a = i.ToString();

         

                textBox3.AppendText("\r\n " + a);

}





        [DllImport("user32.dll")]

        public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter,

            string lpszClass, string lpszWindow);



        [DllImport("user32.dll", SetLastError = true)]

        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);



   [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]

        public static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);



 [DllImport("user32.dll")]

        public static extern int EnumChildWindows(IntPtr hWndParent, CallBack lpfn, int lParam);



}