我們在做web測試時，經常會使用WebBrowser來進行一些自動化的任務。而有些網頁上面會用IFrame去嵌套別的頁面，這些頁面可能不是在相同域名下的，這時就會出現跨域問題，無法直接在WebBrowser中獲取到IFrame中的元素。下面來做個試驗，自己寫個頁面嵌套一個百度的首頁，然後在我們自己的頁面上輸入要查詢的詞，最後在百度上自動完成搜索。
復制代碼 代碼如下:
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<iframe id="baidu" style="float:left;" width="500" height="500" src="http://www.baidu.com"></iframe>
<div>
測試值：<input id="search" type="text" />
</div>
</body>
</html>
下面再建一個簡單的WinForm工程測試一下，界面如下： 
下面就是WebBrowser的測試代碼：
復制代碼 代碼如下:
using System;
using System.Windows.Forms;
namespace WebBrowserTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
this.webBrowser1.Navigate(this.textBox1.Text);
}
private void button2_Click(object sender, EventArgs e)
{
var doc = this.webBrowser1.Document;
var frames = doc.Window.Frames;
String testValue = doc.GetElementById("search").GetAttribute("value");
frames[0].Document.GetElementById("kw").SetAttribute("value", testValue);
frames[0].Document.GetElementById("su").InvokeMember("click");
}
}
}
我們運行我們的測試程序後，加載之前我們自己寫的頁面後，在自己的頁面上輸入我們要查詢的詞，點擊測試按鈕，就會看到程序報未處理 UnauthorizedAccessException錯誤： 
下面來編寫一個Helper類來解決這個問題，主要原理大致就是利用IWebBrowser2這個接口來獲取Ifream中的Dom，IWebBrowser2中的document可以轉換為IHtmlDocument1，IHtmlDocument2，IHtmlDocument3。
復制代碼 代碼如下:
using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using mshtml;
namespace WebBrowserTest
{
// This is the COM IServiceProvider interface, not System.IServiceProvider .Net interface!
[ComImport(), ComVisible(true), Guid("6D5140C1-7436-11CE-8034-00AA006009FA"),
InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
public interface IServiceProvider
{
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int QueryService(ref Guid guidService, ref Guid riid, [MarshalAs(UnmanagedType.Interface)] out object ppvObject);
}
public enum OLECMDF
{
OLECMDF_DEFHIDEONCTXTMENU = 0x20,
OLECMDF_ENABLED = 2,
OLECMDF_INVISIBLE = 0x10,
OLECMDF_LATCHED = 4,
OLECMDF_NINCHED = 8,
OLECMDF_SUPPORTED = 1
}
public enum OLECMDID
{
OLECMDID_PAGESETUP = 8,
OLECMDID_PRINT = 6,
OLECMDID_PRINTPREVIEW = 7,
OLECMDID_PROPERTIES = 10,
OLECMDID_SAVEAS = 4
}
public enum OLECMDEXECOPT
{
OLECMDEXECOPT_DODEFAULT,
OLECMDEXECOPT_PROMPTUSER,
OLECMDEXECOPT_DONTPROMPTUSER,
OLECMDEXECOPT_SHOWHELP
}
[ComImport, Guid("D30C1661-CDAF-11d0-8A3E-00C04FC9E26E"), TypeLibType(TypeLibTypeFlags.FOleAutomation | TypeLibTypeFlags.FDual | TypeLibTypeFlags.FHidden)]
public interface IWebBrowser2
{
[DispId(100)]
void GoBack();
[DispId(0x65)]
void GoForward();
[DispId(0x66)]
void GoHome();
[DispId(0x67)]
void GoSearch();
[DispId(0x68)]
void Navigate([In] string Url, [In] ref object flags, [In] ref object targetFrameName, [In] ref object postData, [In] ref object headers);
[DispId(-550)]
void Refresh();
[DispId(0x69)]
void Refresh2([In] ref object level);
[DispId(0x6a)]
void Stop();
[DispId(200)]
object Application { [return: MarshalAs(UnmanagedType.IDispatch)] get; }
[DispId(0xc9)]
object Parent { [return: MarshalAs(UnmanagedType.IDispatch)] get; }
[DispId(0xca)]
object Container { [return: MarshalAs(UnmanagedType.IDispatch)] get; }
[DispId(0xcb)]
object Document { [return: MarshalAs(UnmanagedType.IDispatch)] get; }
[DispId(0xcc)]
bool TopLevelContainer { get; }
[DispId(0xcd)]
string Type { get; }
[DispId(0xce)]
int Left { get; set; }
[DispId(0xcf)]
int Top { get; set; }
[DispId(0xd0)]
int Width { get; set; }
[DispId(0xd1)]
int Height { get; set; }
[DispId(210)]
string LocationName { get; }
[DispId(0xd3)]
string LocationURL { get; }
[DispId(0xd4)]
bool Busy { get; }
[DispId(300)]
void Quit();
[DispId(0x12d)]
void ClientToWindow(out int pcx, out int pcy);
[DispId(0x12e)]
void PutProperty([In] string property, [In] object vtValue);
[DispId(0x12f)]
object GetProperty([In] string property);
[DispId(0)]
string Name { get; }
[DispId(-515)]
int HWND { get; }
[DispId(400)]
string FullName { get; }
[DispId(0x191)]
string Path { get; }
[DispId(0x192)]
bool Visible { get; set; }
[DispId(0x193)]
bool StatusBar { get; set; }
[DispId(0x194)]
string StatusText { get; set; }
[DispId(0x195)]
int ToolBar { get; set; }
[DispId(0x196)]
bool MenuBar { get; set; }
[DispId(0x197)]
bool FullScreen { get; set; }
[DispId(500)]
void Navigate2([In] ref object URL, [In] ref object flags, [In] ref object targetFrameName, [In] ref object postData, [In] ref object headers);
[DispId(0x1f5)]
OLECMDF QueryStatusWB([In] OLECMDID cmdID);
[DispId(0x1f6)]
void ExecWB([In] OLECMDID cmdID, [In] OLECMDEXECOPT cmdexecopt, ref object pvaIn, IntPtr pvaOut);
[DispId(0x1f7)]
void ShowBrowserBar([In] ref object pvaClsid, [In] ref object pvarShow, [In] ref object pvarSize);
[DispId(-525)]
WebBrowserReadyState ReadyState { get; }
[DispId(550)]
bool Offline { get; set; }
[DispId(0x227)]
bool Silent { get; set; }
[DispId(0x228)]
bool RegisterAsBrowser { get; set; }
[DispId(0x229)]
bool RegisterAsDropTarget { get; set; }
[DispId(0x22a)]
bool TheaterMode { get; set; }
[DispId(0x22b)]
bool AddressBar { get; set; }
[DispId(0x22c)]
bool Resizable { get; set; }
}
class CorssDomainHelper
{
private static Guid IID_IWebBrowserApp = new Guid("0002DF05-0000-0000-C000-000000000046");
private static Guid IID_IWebBrowser2 = new Guid("D30C1661-CDAF-11D0-8A3E-00C04FC9E26E");
// Utility for IE cross domain access
// Returns null in case of failure.
public static IHTMLDocument3 GetDocumentFromWindow(IHTMLWindow2 htmlWindow)
{
if (htmlWindow == null)
{
return null;
}
// First try the usual way to get the document.
try
{
IHTMLDocument2 doc = htmlWindow.document;
return (IHTMLDocument3)doc;
}
catch (COMException comEx)
{
// I think COMException won't be ever fired but just to be sure ...
}
catch (UnauthorizedAccessException)
{
}
catch (Exception ex)
{
return null;
}
// At this point the error was E_ACCESSDENIED because the frame contains a document from another domain.
// IE tries to prevent a cross frame scripting security issue.
try
{
// Convert IHTMLWindow2 to IWebBrowser2 using IServiceProvider.
IServiceProvider sp = (IServiceProvider)htmlWindow;
// Use IServiceProvider.QueryService to get IWebBrowser2 object.
Object brws = null;
sp.QueryService(ref IID_IWebBrowserApp, ref IID_IWebBrowser2, out brws);
// Get the document from IWebBrowser2.
IWebBrowser2 browser = (IWebBrowser2)(brws);
return (IHTMLDocument3)browser.Document;
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
return null;
}
}
}
最後將我們的運行代碼改為如下形式，調用Helper類中的GetDocumentFromWindow方法：
復制代碼 代碼如下:
using System;
using System.Windows.Forms;
using mshtml;
namespace WebBrowserTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
this.webBrowser1.Navigate(this.textBox1.Text);
}
private void button2_Click(object sender, EventArgs e)
{
var doc = this.webBrowser1.Document;
var frames = doc.Window.Frames;
String testValue = doc.GetElementById("search").GetAttribute("value");
IHTMLDocument3 baiduDoc = CorssDomainHelper.GetDocumentFromWindow(frames[0].DomWindow as IHTMLWindow2);
baiduDoc.getElementById("kw").setAttribute("value", testValue);
baiduDoc.getElementById("su").click();
}
}
}
最後運行一下程序可以看到我們可以正常獲取到百度上的元素了。
補充一下路過秋天說的問題：
其實關於這些接口其實我也沒有很深入的研究過，不過網上倒是能搜到很多相關資料介紹這些接口的不同，我這裡給一個鏈接：
http://hi.baidu.com/christole/item/1c8dfd1a791a53643f87ced8
然後關於我上面的代碼為什麼要使用IHMLDocument3，而不是其它兩個接口，因為IHMLDocument3這個接口裡面定義了我需要的getElementById這個方法。
通過查看MSDN，你可以找到你需要的屬性或者方法，然後直接在代碼裡面轉換為你需要的類型使用就可以了，它們之間都是可以互相轉化的。比如上面我用完了getElementById方法，我需要查看網頁的title，那麼可以將我上面的baiduDoc變量強制轉為IHMLDocument2，然後就可以直接使用它的title屬性了。
參考鏈接：
http://msdn.microsoft.com/en-us/library/aa752052(v=vs.85).aspx
http://codecentrix.blogspot.com/2007/10/when-ihtmlwindow2getdocument-returns.html
http://msdn.microsoft.com/en-us/library/aa752641(v=VS.85).aspx
