IHTMLWindow2 get_document fails with Access is Denied on IFrame

get_document fails with Access is denied with IFrame's

whats the problem ?, i took most of this code from microsoft's site.

thanks,
lee.

I wait for if (dispidMember == DISPID_DOCUMENTCOMPLETE)
parse the html page ok, look for frames and process those, which usually works but i've found IFrames makes it fall over with Access is Denied.

VARIANT frameRequested;
VARIANT frameOut;
IHTMLFramesCollection2* pFramesCol = NULL;
IHTMLWindow2* pRightFrameWindow = NULL;
IHTMLDocument2* pRightDoc = NULL;

frameRequested.vt = VT_UINT;

HRESULT hr = spHTML->get_frames(&pFramesCol);
if (FAILED(hr))
{
MessageBox(NULL,_T("no frames"),NULL,NULL);
return FALSE;
}

long len = 0;
pFramesCol->get_length(&len);
if(len==0) return FALSE;

for(int f=0;f<len;f++)
{
MessageBox(NULL,CComBSTR(frames[f]),NULL,NULL);

frameRequested.lVal = f;

hr = pFramesCol->item(&frameRequested, &frameOut);
if (SUCCEEDED(hr)) // frame present
{

hr = frameOut.pdispVal->QueryInterface(IID_IHTMLWindow2, (LPVOID *)&pRightFrameWindow);
if (SUCCEEDED(hr)) // QueryInterface OK
{


hr = pRightFrameWindow->get_document(&pRightDoc);
if (!SUCCEEDED(hr))
{
_com_error e( hr );
MessageBox(NULL, CComBSTR(e.ErrorMessage()),NULL,NULL );
}

Hi,
You can't get from a "normal" Frame acess to the Document of a IFRAME, also if you try you will see that when you receive the DocumentComplete from a IFRAME you also can't get the Document from the Parent window, or Top Window.
This behaviour is if I'm not mistaken if the Domain differs and it's not a bug.

thanks for that, I have partially got around that problem by using IHTMLFrameBase instead which works fine with IFrames in the html document root.

but I don't know how to implement it within a Frame.. i'm really stuck!
any ideas anybody ? some code would be a god send.

thanks,
lee.

Hi,
The IHTMLFrameBase doesn't give acess to the Document, how did you managed to get it from there ???

If you want to get the document from a frame, the
get_document of the IHTMLWindow2 seems to work fine.

So you only need to query each Frame Item for a IHTMLWindow2 and then use the get_document if
the returned IHTMLDocument2 isn't null then you are probably dealing with a frame.
Once you have the frame you can Query it for a
IOleWindow and then get the window Handle.

If you managed to get the document of a IFRAME from another Frame, please let me know.

thanks,

ok will look into that... thanks.

heres the IID_IHTMLFrameBase code which works with javascript IFrames in the document root, it took a while to work it out. shame there isn't more examples on microsofts IE site!, you know of any other sites ???

have fun.


BOOL CViewSource::RetrieveIFrames()
{
HRESULT hr;

IHTMLFramesCollection2* pFramesCol = NULL;

hr = spHTML->get_frames(&pFramesCol);

IHTMLElementCollection* pColl = NULL;
if(SUCCEEDED(hr = spHTML->get_all( &pColl )))
{
long length = 0;
if(SUCCEEDED(hr = pColl->get_length(&length)) && (length))
{
for (int x = 0; x < length; x++ )
{
VARIANT Index;
IDispatch* pDisp2 = NULL;
Index.vt = VT_UINT;
Index.lVal = x;
VARIANT var2;
VariantInit( &var2 );
if(SUCCEEDED(hr = pColl->item (Index, var2, &pDisp2)))
{

IHTMLFrameBase* pBase = NULL;

if(SUCCEEDED(hr = pDisp2->QueryInterface(IID_IHTMLFrameBase,(void**)&pBase)) && (pBase))
{
BSTR src = NULL;
if(SUCCEEDED(pBase->get_src(&src)))
{
// do whatever you want

}

}

}

}
}

}

return S_OK;
}

The code you posted doesn't give acess to the "document", what I needed was a way to get the IHTMLDocument of a "IFRAME" in a IHTMLFramesCollection. But thanks anyway, if you need the code to get the IHTMLDocument of a "FRAME" let me know...

Unfortunately code examples for the HTML Interfaces are rare... so the best way to get info are the Newsgroups.

Thanks,

yes please.

any code is usefull.

thanks,
lee.

hr = pHTMLDoc->get_frames(&pFrameCol);
if(SUCCEEDED(hr) && pFrameCol)
{
long lNumberOfFrames = 0;
pFrameCol->get_length(&lNumberOfFrames);
VARIANT varObject;
VARIANT varTmp;
varTmp.vt = VT_INT;
for(long i=0; i<lNumberOfFrames; i++)
{
varTmp.intVal = i;
pFrameCol->item(&varTmp, &varObject);
if(varObject.pdispVal)
{
// Get this Window
hr = varObject.pdispVal->QueryInterface(IID_IHTMLWindow2, (void**) &pHTMLWindow2Aux);

if(SUCCEEDED(hr) && pHTMLWindow2Aux)
{
hr = pHTMLWindow2Aux->get_document(&pHTMLDocAux);
if(SUCCEEDED(hr))
{
if(pHTMLDocAux) // Possible Frame
{
// At this point you have a valid IHTMLDocument
// To get the HANDLE of the Frame Window
hr = pHTMLDocAux->QueryInterface(IID_IOleWindow,(void**)&pOleWindowAux);
if(SUCCEEDED(hr) && pOleWindowAux)
{
HWND hwndTmp = NULL;
hr = pOleWindowAux->GetWindow(&hwndTmp);
}




**********
By the way if you haven't notices if a page has a META TAG of Refresh but doesn't give a diferent URL you don't receive the DocumentComplete Notification, do you know a way to identify if the page was refreshed ?

I forgot to ask if you know how to detect if a page was readed or not from the cache...

Quote:

---

Originally Posted by AWarlock

The code you posted doesn't give acess to the "document", what I needed was a way to get the IHTMLDocument of a "IFRAME" in a IHTMLFramesCollection. But thanks anyway, if you need the code to get the IHTMLDocument of a "FRAME" let me know...

Unfortunately code examples for the HTML Interfaces are rare... so the best way to get info are the Newsgroups.

Thanks,

---

now ok:

CComPtr < IHTMLDocument2 > spDoc2;
hr = spWin2->get_document( &spDoc2 ); //error in here!!!!
if (!SUCCEEDED(hr))
{
_com_error e( hr ); Display("get document error:"+CString(e.ErrorMessage()));
spDoc2=HtmlWindowToHtmlDocument(spWin2);//ok now!!!!
}




// Converts a IHTMLWindow2 object to a IWebBrowser2. Returns NULL in case of failure.
CComQIPtr<IWebBrowser2> HtmlWindowToHtmlWebBrowser(CComQIPtr<IHTMLWindow2> spWindow)
{
ATLASSERT(spWindow != NULL);

CComQIPtr<IServiceProvider> spServiceProvider = spWindow;
if (spServiceProvider == NULL)
{
return CComQIPtr<IWebBrowser2>();
}

CComQIPtr<IWebBrowser2> spWebBrws;
HRESULT hRes = spServiceProvider->QueryService(IID_IWebBrowserApp, IID_IWebBrowser2, (void**)&spWebBrws);
if (hRes != S_OK)
{
return CComQIPtr<IWebBrowser2>();
}

return spWebBrws;
}


CComQIPtr<IHTMLDocument2> HtmlWindowToHtmlDocument(CComQIPtr<IHTMLWindow2> spWindow)
{
ATLASSERT(spWindow != NULL);

CComQIPtr<IHTMLDocument2> spDocument;
HRESULT hRes = spWindow->get_document(&spDocument);

if ((S_OK == hRes) && (spDocument != NULL))
{
// The html document was properly retrieved.
return spDocument;
}

// hRes could be E_ACCESSDENIED that means a security restriction that
// prevents scripting across frames that loads documents from different internet domains.
CComQIPtr<IWebBrowser2> spBrws = HtmlWindowToHtmlWebBrowser(spWindow);
if (spBrws == NULL)
{
return CComQIPtr<IHTMLDocument2>();
}

// Get the document object from the IWebBrowser2 object.
CComQIPtr<IDispatch> spDisp;
hRes = spBrws->get_Document(&spDisp);
spDocument = spDisp;

return spDocument;
}