if(m_psd.hDevNames == NULL)
if(m_pd.hDevNames == NULL)
	LPCTSTR GetPortName() const     // return output port name	{		if(m_psd.hDevNames == NULL)			return NULL;		LPDEVNAMES lpDev = (LPDEVNAMES)::GlobalLock(m_psd.hDevNames);		return (LPCTSTR)lpDev + lpDev->wOutputOffset;	}