Serialization of GUID variable in MFC

[ajbharani]

I'm trying to serialize a GUID object in MFC. When I try to archive, I get the following error

binary '<<' : no operator defined which takes a right-hand operand of type 'struct _GUID' (or there is no acceptable conversion)

My code snippet is this

    void MyClass :: Serialize(CArchive &ar)
    {
      CObject::Serialize( ar );
      if( ar.IsStoring())
      {
        ar << m_GUIDVariable;
      }
      else
      {
        ar >> m_GUIDVariable;
      }
    }

How shall I proceed?