stdafx.h

实现PING 的两种方法

#if !defined(AFX_STDAFX_H__2F9FA3A9_3C15_436E_B976_A1C19DB5D5D5__INCLUDED_)
#define AFX_STDAFX_H__2F9FA3A9_3C15_436E_B976_A1C19DB5D5D5__INCLUDED_

// stdafx.h : include file for standard system include files,
//  or project specific include files that are used frequently, but
//      are changed infrequently
//
//
/////////////////////////////////////////////////////////////////////////////
//
// Copyright