How To Retrieve the URL of a Web Page from an ActiveX Control

1. 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.
2. Obtain a moniker to the client site by calling IOleClientSite::GetMoniker().
3. Call IMoniker::GetDisplayName() to obtain the URL for the current document.

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);
}