C#获得窗口控件句柄

[DllImport("User32.dll", EntryPoint = "FindWindow")] private static extern IntPtr FindWindow(string lpClassName,string lpWindowName); [DllImport("user32.dll", EntryPoint = "FindWindowEx",SetLastError = true)] private static extern IntPtr FindWindowEx(IntPtr hwndParent,IntPtr hwndChildAfter, stringlpszClass, string lpszWindow); [DllImport("User32.dll", EntryPoint = "SendMessage")] private static extern int SendMessage(IntPtr hWnd,int Msg, IntPtr wParam, string lParam); const int WM_GETTEXT = 0x000D; const int WM_SETTEXT = 0x000C; const int WM_CLICK = 0x00F5; public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { int retval = 0; //增加一个返回值用来判断操作是否成功 //string lpszParentClass = "#32770"; //整个窗口的类名 string lpszParentWindow = "Form1"; //窗口标题 string lpszClass = "WindowsForms10.EDIT.app.0.b7ab7b"; //需要查找的子窗口的类名，也就是输入框 //string lpszClass = "Edit"; string lpszClass_Submit = "WindowsForms10.BUTTON.app.0.b7ab7b"; //需要查找的Button的类名 //string lpszClass_Submit = "Button"; string lpszName_Submit = "确定"; //需要查找的Button的标题 string text = ""; IntPtr ParenthWnd = new IntPtr(0); IntPtr EdithWnd = new IntPtr(0); //查到窗体，得到整个窗体 ParenthWnd = FindWindow(null, lpszParentWindow); //判断这个窗体是否有效 if (!ParenthWnd.Equals(IntPtr.Zero)) { //得到Form1这个子窗体的文本框，并设置其内容 EdithWnd = FindWindowEx(ParenthWnd, EdithWnd, lpszClass, ""); [color=#FF0000]这里获取到的EdithWnd始终为0；[/color] if (!EdithWnd.Equals(IntPtr.Zero)) { text = "test1"; //调用SendMessage方法设置其内容 SendMessage(EdithWnd, WM_SETTEXT, IntPtr.Zero, text); retval++; } //得到Button这个子窗体，并触发它的Click事件 EdithWnd = FindWindowEx(ParenthWnd, (IntPtr)0, lpszClass_Submit, lpszName_Submit); if (!EdithWnd.Equals(IntPtr.Zero)) { SendMessage(EdithWnd, WM_CLICK, (IntPtr)0, "0"); retval++; } } }