1 class Program
2 {
3 //define method
4
5 /// <summary>
6 /// 查找顶级窗口,如果有指定的类名和窗口的名字则表示成功返回一个窗口的句柄。否则返回零。
7 /// </summary>
8 /// <param name="lpClassName">lpClassName参数指向类名</param>
9 /// <param name="lpWindowName">lpWindowName指向窗口名</param>
10 /// <returns></returns>
11 [DllImport("User32.dll", EntryPoint = "FindWindow")]
12 private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
13
14 /// <summary>
15 /// 在窗口列表中寻找与指定条件相符的第一个子窗口
16 /// </summary>
17 /// <param name="hwndParent">父窗口句柄</param>
18 /// <param name="hwndChildAfter">子窗口句柄</param>
19 /// <param name="lpszClass">窗口类名</param>
20 /// <param name="lpszWindow">窗口名</param>
21 /// <returns></returns>
22 [DllImport("user32.dll", EntryPoint = "FindWindowEx")]
23 private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
24
25 /// <summary>
26 /// 该函数将指定的消息发送到一个或多个窗口
27 /// </summary>
28 /// <param name="hWnd">接收消息的窗口句柄</param>
29 /// <param name="Msg">指定被发送的消息类型</param>
30 /// <param name="wParam"></param>
31 /// <param name="lParam">发送的消息</param>
32 /// <returns></returns>
33 [DllImport("User32.dll", EntryPoint = "SendMessage")]
34 private static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, string lParam);
35
36 //define message type
37 private const int WM_GETTEXT = 0x000D;
38 private const int WM_SETTEXT = 0x000C;
39 private const int WM_CLICK = 0x00F5;
40
41 public static void Main()
42 {
43 SearchWindow();
44 }
45
46 private static void SearchWindow()
47 {
48 //主窗口类型名及窗口名
49 string lpszParentClassName = "";
50 string lpszParentWindowName = "Print To File";
51 //主窗口句柄
52 IntPtr ParenthWnd = new IntPtr(0);
53 //子窗口句柄
54 IntPtr EdithWnd = new IntPtr(0);
55
56 //查到主窗体，得到整个窗体
57 ParenthWnd = FindWindow(null, lpszParentWindowName);
58 //判断这个窗体是否有效
59 if (!ParenthWnd.Equals(IntPtr.Zero))
60 {
61 //得到FileName这个子窗体，并设置其内容
62 EdithWnd = FindWindowEx(ParenthWnd, EdithWnd, "Edit", "");
63 if (!EdithWnd.Equals(IntPtr.Zero))
64 {
65 //调用SendMessage方法设置其内容
66 SendMessage(EdithWnd, WM_SETTEXT, (IntPtr)0, "你需要输入的文本");
67 }
68 //得到OK这个子窗体，并设置其内容
69 EdithWnd = FindWindowEx(ParenthWnd, EdithWnd, "Button", "OK");
70 if (!EdithWnd.Equals(IntPtr.Zero))
71 {
72 SendMessage(EdithWnd, WM_CLICK, (IntPtr)0, "");
73 }
74 }
75 }
76 }
