During the initialization of an embedded ActiveX control, Internet Explorer
(IE) passes a pointer to its client site by calling
IOleObject::SetClientSite(). This process can be used to either retrieve a
moniker for the container or access the document object model to retrieve
the URL for the hosting Web page.
This article demonstrates how to retrieve the current URL from the
container moniker.
For additional information about how to obtain the URL from the
document object model, please see the following
article in the Microsoft Knowledge Base:
172763 INFO: Accessing the Object Model from Within an ActiveX
Control
Follow these steps to retrieve the current URL from the container moniker:
- Obtain the client site (IOleClientSite) interface pointer. The container
calls IOleObject::SetClientSite() to pass a pointer to the client site.
Override this method to cache this pointer.
- Obtain a moniker to the client site by calling
IOleClientSite::GetMoniker().
- Call IMoniker::GetDisplayName() to obtain the URL for the current
document.
The following sample code demonstrates how to perform the above steps by
overriding the IOleObject::SetClientSite() method in an Active Template
Library (ATL) ActiveX control:
Sample Code
STDMETHOD(SetClientSite)(IOleClientSite *pClientSite)
{
if (pClientSite != NULL)
{
// Obtain URL from container moniker.
CComPtr<IMoniker> spmk;
LPOLESTR pszDisplayName;
if (SUCCEEDED(pClientSite->GetMoniker(
OLEGETMONIKER_TEMPFORUSER,
OLEWHICHMK_CONTAINER,
&spmk)))
{
if (SUCCEEDED(spmk->GetDisplayName(
NULL, NULL, &pszDisplayName)))
{
USES_CONVERSION;
CComBSTR bstrURL;
bstrURL = pszDisplayName;
ATLTRACE("The current URL is %s\n", OLE2T(bstrURL));
CoTaskMemFree((LPVOID)pszDisplayName);
}
}
}
return IOleObject_SetClientSite(pClientSite);
}