user32的使用

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1. 通过代码查询特定的窗口，并在文本框中输入文字然后单击"OK"按钮
   
   • 需要查找的Dialog

     

   • 使用Spy++查看窗口信息

     

   • 通过代码实现功能

      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     }

      

user32的使用

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原文地址：http://www.cnblogs.com/JustYong/p/4048683.html