C # show you how to get the document object from the IE window step by step

1. Use Win32 API or UI Atomation to obtain the window. The window type is "Internet assumer_server" 2. Add reference: MSHTML, SHDocVw (Microsoft Internet Controls), Accessibility 3. Import API AccessibleObjectFromWindow: You can refer to pInvoke.net for more useful information. 4. Get Acc from the window: (hienative?whandle is the window pointer obtained in step 1)

           object objAcc = null;
            Guid guidAcc = typeof( IAccessible).GUID;
            AccessibilityAPI.AccessibleObjectFromWindow( (IntPtr)hIENativeWindowHandle,
0,
ref guidAcc,
ref objAcc);
                IAccessible oAccIE = objAcc as IAccessible;

5. Get IServiceProvider

 IServiceProvider oServiceProvider = oAccIE as IServiceProvider

6. Take Document

                   object objHTMLWin2 = null;
                    Guid guidHTML2 = typeof(mshtml.IHTMLWindow2).GUID;
                    oServiceProvider.QueryService(ref guidHTML2, ref guidHTML2, out objHTMLWin2 )
                    IHTMLWindow2 oIEWin2 = objHTMLWin2  as IHTMLWindow2;
                    IHTMLDocument2  docRoot = oIEWin2.document as IHTMLDocument2;

The above code is passed on VS 2008 and Vista.