C# -- IE automation #7 -- iframe 접근하기

C# -- IE automation #7 -- iframe 접근하기

환경 : windows 7 64bit, visual studio 2013 community

참고 : http://stackoverflow.com/a/14661214  --> CrossFrameIE class

         http://stackoverflow.com/a/19275241   --> setting [STAThread]

1, iframe 내부 접근시, InvalidCastException 발생.

Main() 함수를 [STAThread] 로 지정하면,  InvalidCastException 문제 해결됨.

but, 새로운 예외  UnauthorizedAccessException 발생함.

** UnauthorizedAccessException  해결위해 , stackoverflow 검색하여 CrossFrameIE class 사용함.

<< 완성 소스 >>

	using System;
	using SHDocVw;
	using mshtml;
	using System.Runtime.InteropServices;
	namespace IE_iframe_ex
	{
	class Program
	{
	[STAThread]
	static void Main(string[] args)
	{
	var IE = new SHDocVw.InternetExplorer();
	IE.Visible = true;
	dynamic url = "http://www.daum.net";
	IE.Navigate2(ref url);
	IE.Wait(); // 페이지의 요소를 반영하기 위해서는 페이지가 표시 될 때까지 기다릴 필요
	mshtml.IHTMLDocument3 doc = IE.Document as mshtml.IHTMLDocument3;
	mshtml.IHTMLElementCollection iframeColl = doc.getElementsByTagName("iframe");
	foreach (mshtml.HTMLIFrame ifrElem in iframeColl)
	{
	if (ifrElem != null)
	{
	// mshtml.IHTMLDocument2 newdoc2 = ifrElem.contentWindow.document;
	mshtml.IHTMLDocument2 newdoc2 = CrossFrameIE.GetDocumentFromWindow(ifrElem.contentWindow);
	mshtml.IHTMLElement bodyElement = newdoc2.body;
	Console.WriteLine(bodyElement.innerHTML);
	}
	}
	Console.ReadLine(); // Enter 입력해야 다음으로 넘아감.
	}
	}
	// 페이지 로딩 완료까지 대기하는 확장 메서드
	public static class SHDovVwEx
	{
	public static void Wait(this SHDocVw.InternetExplorer ie, int millisecond = 0)
	{
	while (ie.Busy == true || ie.ReadyState != SHDocVw.tagREADYSTATE.READYSTATE_COMPLETE)
	{
	System.Threading.Thread.Sleep(100);
	}
	System.Threading.Thread.Sleep(millisecond);
	}
	}
	public class CrossFrameIE
	{
	// Returns null in case of failure.
	public static IHTMLDocument2 GetDocumentFromWindow(IHTMLWindow2 htmlWindow)
	{
	if (htmlWindow == null)
	{
	return null;
	}
	// First try the usual way to get the document.
	try
	{
	IHTMLDocument2 doc = htmlWindow.document;
	return doc;
	}
	catch (COMException comEx)
	{
	// I think COMException won't be ever fired but just to be sure ...
	if (comEx.ErrorCode != E_ACCESSDENIED)
	{
	return null;
	}
	}
	catch (System.UnauthorizedAccessException)
	{
	}
	catch
	{
	// Any other error.
	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 (IHTMLDocument2)browser.Document;
	}
	catch
	{
	}
	return null;
	}
	private const int E_ACCESSDENIED = unchecked((int)0x80070005L);
	private static Guid IID_IWebBrowserApp = new Guid("0002DF05-0000-0000-C000-000000000046");
	private static Guid IID_IWebBrowser2 = new Guid("D30C1661-CDAF-11D0-8A3E-00C04FC9E26E");
	}
	// 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);
	}
	}

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