从IE浏览器获取当前页面的内容

从IE浏览器获取当前页面内容可能有多种方式，今天我所介绍的是其中一种方法。基本原理：当鼠标点击当前IE页面时，获取鼠标的坐标位置，根据鼠标位置获取当前页面的句柄，然后根据句柄，调用win32的东西进而获取页面内容。具体代码：

      private void timer1_Tick(object sender, EventArgs e)
         {
             lock (currentLock)
             {
                 System.Drawing.Point MousePoint = System.Windows.Forms.Form.MousePosition;
                 if (_leftClick)
                 {
                     timer1.Stop();
                     _leftClick = false;
 
                     _lastDocument = GetHTMLDocumentFormHwnd(GetPointControl(MousePoint, false));
                     if (_lastDocument != null)
                     {
                         if (_getDocument)
                         {
                             _getDocument = true;
                             try
                             {
                                 string url = _lastDocument.url;
                                 string html = _lastDocument.documentElement.outerHTML;
                                 string cookie = _lastDocument.cookie;
                                 string domain = _lastDocument.domain;
 
                                 var resolveParams = new ResolveParam
                                     {
                                         Url = new Uri(url),
                                         Html = html,
                                         PageCookie = cookie,
                                         Domain = domain
                                     };
 
                                 RequetResove(resolveParams);
                             }
                             catch (Exception ex)
                             {
                                 System.Windows.MessageBox.Show(ex.Message);
                                 Console.WriteLine(ex.Message);
                                 Console.WriteLine(ex.StackTrace);
                             }
                         }
                     }
                     else
                     {
                         new MessageTip().Show("xx", "当前页面不是IE浏览器页面，或使用了非IE内核浏览器，如火狐，搜狗等。请使用IE浏览器打开网页");
                     }
 
                     _getDocument = false;
                 }
                 else
                 {
                     _pointFrm.Left = MousePoint.X + ;
                     _pointFrm.Top = MousePoint.Y + ;
                 }
             }
 
         }

第11行的  GetHTMLDocumentFormHwnd(GetPointControl(MousePoint, false))  分解下，先从鼠标坐标获取页面的句柄：

         public static IntPtr GetPointControl(System.Drawing.Point p, bool allControl)
         {
             IntPtr handle = Win32APIsFull.WindowFromPoint(p);
             if (handle != IntPtr.Zero)
             {
                 System.Drawing.Rectangle rect = default(System.Drawing.Rectangle);
                 if (Win32APIsFull.GetWindowRect(handle, out rect))
                 {
                     return Win32APIsFull.ChildWindowFromPointEx(handle, new System.Drawing.Point(p.X - rect.X, p.Y - rect.Y), allControl ? Win32APIsFull.CWP.ALL : Win32APIsFull.CWP.SKIPINVISIBLE);
                 }
             }
             return IntPtr.Zero;
 
         }

接下来，根据句柄获取页面内容：

        public static HTMLDocument GetHTMLDocumentFormHwnd(IntPtr hwnd)
         {
             IntPtr result = Marshal.AllocHGlobal();
             Object obj = null;
 
             Console.WriteLine(Win32APIsFull.SendMessageTimeoutA(hwnd, HTML_GETOBJECT_mid, , , , , result));
             if (Marshal.ReadInt32(result) != )
             {
                 Console.WriteLine(Win32APIsFull.ObjectFromLresult(Marshal.ReadInt32(result), ref IID_IHTMLDocument, , out obj));
             }
 
             Marshal.FreeHGlobal(result);
 
             return obj as HTMLDocument;
         }

大致原理：

给IE窗体发送消息，获取到一个指向 IE浏览器（非托管）的某个内存块的指针，然后根据这个指针获取到HTMLDocument对象。

这个方法涉及到win32的两个函数：

      [System.Runtime.InteropServices.DllImportAttribute("user32.dll", EntryPoint = "SendMessageTimeoutA")]
        public static extern int SendMessageTimeoutA(
            [InAttribute()] System.IntPtr hWnd,
            uint Msg, uint wParam, int lParam,
            uint fuFlags,
            uint uTimeout,
            System.IntPtr lpdwResult);

      [System.Runtime.InteropServices.DllImportAttribute("oleacc.dll", EntryPoint = "ObjectFromLresult")]
        public static extern int ObjectFromLresult(
         int lResult,
         ref Guid riid,
         int wParam,
         [MarshalAs(UnmanagedType.IDispatch), Out]
        out Object pObject
        );