Internet Explorer_Server 获取文本的问题

C/C++ code

 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


[解决办法]
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!!!
}


[解决办法]
你用GetLastError看看是什么错误了
[解决办法]

C/C++ code

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    }}