Get the position of IHTMLElement without Webbrowser

[RyanWool]

Hi,

Now I have a problem with getting the IHTMLElement's position information
without webbrowser.

When I did this, I can get the right x value:

IHTMLDocument* pDoc;
spWebbrowser->get_Document(&pDoc);

pDoc->get_Body(&spBody);
spBody->get_offsetWidth(&x);

But when I load a string into a IHTMLDocument created by my self.
I got x=0. Code is below:

HRESULT hr = CoCreateInstance(CLSID_HTMLDocument, NULL, CLSCTX_INPROC_SERVER,
IID_IHTMLDocument2, (void**)&pDoc);

//put the code into SAFEARRAY and write it into document
SAFEARRAY* psa = SafeArrayCreateVector(VT_VARIANT, 0, 1);
VARIANT *param;
bstr_t bsData = (LPCTSTR)csWholeFile;
hr = SafeArrayAccessData(psa, (LPVOID*)&param);
param->vt = VT_BSTR;
param->bstrVal = (BSTR)bsData;

hr = pDoc->write(psa);
hr = pDoc->close();

SafeArrayDestroy(psa);

CComPtr<MSHTML::IHTMLElement> spBody;
pDoc->get_body(&spBody);

long ox = 0;
long oy = 0;

if (spBody)
{
spBody->get_offsetHeight(&ox);
spBody->get_offsetWidth(&oy);
}

If I want to get the position information of some elements, must I put the page into one webbrowser and displayed them?

Can you help me out of this?
Is there any way to get the infor without really display them?

Thank you.