//IObjectConstruct implementation
STDMETHODIMP CCommsWorker::Construct(IDispatch * pCtorObj)
{
   //    construct_string method is called by COM+
   //    if so configured in Component Services.
   //    Component Properties, Activation tab, Object
   //   constructor settings.
   HRESULT hr;
   CComPtr<IObjectConstructString> object_construct_string=NULL;
   BSTR construct_string=NULL;

   USES_CONVERSION;
  
   m_strConfigFileName = "";
   if (pCtorObj==NULL) return S_OK;

   try
   {
      // first get the IObjectConstructString interface from the
      // constructor object
      // THE CODE BELOW CAUSES THE COMPILE ERROR
      hr = pCtorObj->QueryInterface(IID_IObjectConstructString,
         reinterpret_cast<void**>(&object_construct_string) );
      if (!SUCCEEDED(hr) || object_construct_string==NULL) return S_OK;
        
      // Get the constructor string
      hr = object_construct_string->get_ConstructString(&construct_string);      
      if (!SUCCEEDED(hr)) return S_OK;

      // copy the string -- memory allocated by OLE2CA will
      // be automatically released when the method ends.
      m_strConfigFileName = (construct_string == NULL ? "" : OLE2CA(construct_string));
      
      // free the string we got from IObjectConstructString
      SysFreeString(construct_string);
   }
   catch(...)
   {
      // ignore any exceptions...
   }
   return S_OK;
}