user32的使用

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

          class Program
          {
              //define method
     
              /// <summary>
              /// 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。
              /// </summary>
              /// <param name="lpClassName">lpClassName参数指向类名</param>
              /// <param name="lpWindowName">lpWindowName指向窗口名</param>
              /// <returns></returns>
              [DllImport("User32.dll", EntryPoint = "FindWindow")]
              private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
     
              /// <summary>
              /// 在窗口列表中寻找与指定条件相符的第一个子窗口
              /// </summary>
              /// <param name="hwndParent">父窗口句柄</param>
              /// <param name="hwndChildAfter">子窗口句柄</param>
              /// <param name="lpszClass">窗口类名</param>
              /// <param name="lpszWindow">窗口名</param>
              /// <returns></returns>
              [DllImport("user32.dll", EntryPoint = "FindWindowEx")]
              private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
     
              /// <summary>
              /// 该函数将指定的消息发送到一个或多个窗口
              /// </summary>
              /// <param name="hWnd">接收消息的窗口句柄</param>
              /// <param name="Msg">指定被发送的消息类型</param>
              /// <param name="wParam"></param>
              /// <param name="lParam">发送的消息</param>
              /// <returns></returns>
              [DllImport("User32.dll", EntryPoint = "SendMessage")]
              private static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, string lParam);
     
              //define message type
              private const int WM_GETTEXT = 0x000D;
              private const int WM_SETTEXT = 0x000C;
              private const int WM_CLICK = 0x00F5;
     
              public static void Main()
              {
                  SearchWindow();
              }
     
              private static void SearchWindow()
              {
                  //主窗口类型名及窗口名
                  string lpszParentClassName = "";
                  string lpszParentWindowName = "Print To File";
                  //主窗口句柄
                  IntPtr ParenthWnd = new IntPtr();
                  //子窗口句柄
                  IntPtr EdithWnd = new IntPtr();
     
                  //查到主窗体，得到整个窗体
                  ParenthWnd = FindWindow(null, lpszParentWindowName);
                  //判断这个窗体是否有效
                  if (!ParenthWnd.Equals(IntPtr.Zero))
                  {
                      //得到FileName这个子窗体，并设置其内容
                      EdithWnd = FindWindowEx(ParenthWnd, EdithWnd, "Edit", "");
                      if (!EdithWnd.Equals(IntPtr.Zero))
                      {
                          //调用SendMessage方法设置其内容
                          SendMessage(EdithWnd, WM_SETTEXT, (IntPtr), "你需要输入的文本");
                      }
                      //得到OK这个子窗体，并设置其内容
                      EdithWnd = FindWindowEx(ParenthWnd, EdithWnd, "Button", "OK");
                      if (!EdithWnd.Equals(IntPtr.Zero))
                      {
                          SendMessage(EdithWnd, WM_CLICK, (IntPtr), "");
                      }
                  }
              }
          }