Internet Explorer_Server 获取文本的问题

[每件事]

 HWND  m_hwnd;
	m_hwnd =  ::FindWindow(NULL,"系统公告");
	m_hwnd = FindWindowEx(m_hwnd, 0, "WTL_SplitterWindow", NULL);
	m_hwnd = FindWindowEx(m_hwnd, 0, "WTL_PaneContainer", NULL);
    m_hwnd = FindWindowEx(m_hwnd, 0, "AtlAxWin71", NULL);
	m_hwnd = FindWindowEx(m_hwnd, 0, "Shell Embedding", NULL);
	m_hwnd = FindWindowEx(m_hwnd, 0, "Shell DocObject View", NULL);
	m_hwnd = FindWindowEx(m_hwnd, 0, "Internet Explorer_Server", NULL);


	UINT nMsg = ::RegisterWindowMessage( _T("WM_HTML_GETOBJECT") );
	LRESULT lRes;
	::SendMessageTimeout( m_hwnd, nMsg, 0L, 0L, SMTO_ABORTIFHUNG, 1000, (DWORD*) &lRes );
	
	CComPtr < IHTMLDocument2 > spDoc;
	HRESULT hr = FALSE;
	hr=CoInitialize(0);
	 hr = ::ObjectFromLresult ( lRes, IID_IHTMLDocument2, 0 , (LPVOID *) &spDoc );
	if ( FAILED ( hr ) )	return TRUE;

hr =-2147221008 ; 这里出错了。

上面获取“Internet Explorer_Server”的 句柄是对的，我用SPY++看了。
软件主要是想，获取Internet Explorer_Server上得文本数据。现在如果获得到了IHtmlDocument2接口，下面该怎么获得文本。
麻烦大家帮帮忙，O(∩_∩)O谢谢

[fishion]

if(spDoc==NULL)
return S_FALSE;
IHTMLElementCollection* pIHTMLElementCollection=NULL;
if(spDoc-> get_all(&pIHTMLElementCollection)==S_OK)
{
long l;
pIHTMLElementCollection-> get_length(&l);
CComVariant v1,v2;
v1=(long)0;
v2=(long)0;
IDispatch* pDisp;
pIHTMLElementCollection-> item(v1,v2,&pDisp);
CComQIPtr <IHTMLElement, &IID_IHTMLElement> pHTMLElement(pDisp);
if(pHTMLElement!=NULL)
{
CComBSTR str;
pHTMLElement-> get_innerHTML(&str);//ok!!!
}

[fishion]

你用GetLastError看看是什么错误了

[ysjyniiq]

void FindFromShell() 
{
	CComPtr< IShellWindows > spShellWin;
	HRESULT hr = spShellWin.CoCreateInstance( CLSID_ShellWindows );
	if ( FAILED( hr ) )    return;

	long nCount=0;
	spShellWin->get_Count(&nCount);   // 取得浏览器实例个数

	for(long i=0; i<nCount; i++)
     	  {
             		 CComPtr< IDispatch > spDisp;
		hr=spShellWin->Item(CComVariant( i ), &spDisp );
		if ( FAILED( hr ) )   continue;

		CComQIPtr< IWebBrowser2 > spBrowser = spDisp;
		if ( !spBrowser )     continue;

		spDisp.Release();
		hr = spBrowser->get_Document( &spDisp );
		if ( FAILED ( hr ) )  continue;

		CComQIPtr< IHTMLDocument2 > spDoc = spDisp;
		if ( !spDoc )         continue;

		// 程序运行到此，已经找到了 IHTMLDocument2 的接口指针
	}
}