HRESULT GetMemberName(
   DISPID id,
   BSTR *pbstrName
);

HRESULT hr;
   BSTR bstrName;
   DISPID dispid;
   IDispatchEx *pdex;
   // Assign to pdex
   hr = pdex->GetNextDispID(fdexEnumAll, DISPID_STARTENUM, &dispid);
   while (hr == NOERROR)
   {
      hr = pdex->GetMemberName(dispid, &bstrName);
      if (!wcscmp(bstrName, OLESTR("Bar")))
      {
         SysFreeString(bstrName);
         return TRUE;
      }
   SysFreeString(bstrName);
   hr = pdex->GetNextDispID(fdexEnumAll, dispid, &dispid);
   }