//?ping.cpp?:?Defines?the?entry?point?for?the?console?application.
//

#include?“stdafx.h“
#include
#include
#include
#include
#include
#pragma?comment（lib“WS2_32“）

typedef?struct?IPHeader?{
??UCHAR??iph_verlen;??//?Version?and?length?
??UCHAR??iph_tos;??//?Type?of?service?
??USHORT??iph_length;??//?Total?datagram?length?
??USHORT??iph_id;??//?Identification?
??USHORT??iph_offset;??//?Flags?fragment?offset?
??UCHAR??iph_ttl;??//?Time?to?live?
??UCHAR??iph_protocol;??//?Protocol?
??USHORT??iph_xsum;??//?Header?checksum?
??ULONG??iph_src;??//?Source?address?
??ULONG??iph_dest;??//?Destination?address?
}?IPHeader;?

USHORT?checksum（USHORT?*buffint?size）
{
	unsigned?long?cksum?=?0;
	//將數(shù)據(jù)以字單位累加到cksum?中
	while（size?>?1）
	{
		cksum?+=?*buff++;
		size?-=?sizeof（USHORT）;
	}
	//如果為奇數(shù)，將最后一個(gè)字節(jié)擴(kuò)展為雙字，再累加到cksum中
	if（size）
	{
		cksum?+=?*（UCHAR*）?buff;
	}
	//將cksum的高16位和低16位相加，去反后得到校驗(yàn)和
????cksum?=?（cksum?>>

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件????????731??2008-12-08?16:43??ping\ping.h

?????文件????????667??2008-12-26?18:24??ping\StdAfx.h

?????文件???????1196??2008-12-26?18:24??ping\ReadMe.txt

?????文件???????4512??2008-12-26?18:24??ping\ping.dsp

?????文件????????533??2008-12-26?18:24??ping\ping.dsw

?????文件??????58368??2009-01-02?17:20??ping\ping.ncb

?????文件???????1308??2008-12-29?13:32??ping\ping.plg

?????文件????????311??2008-12-26?18:40??ping\StdAfx.cpp

?????文件???????3676??2008-12-29?13:32??ping\ping.cpp

?????文件??????53760??2009-01-02?17:20??ping\ping.opt

?????文件?????164864??2009-01-02?16:38??ping\Debug\vc60.idb

?????文件?????187100??2008-12-26?18:40??ping\Debug\ping.pch

?????文件?????258048??2008-12-29?13:32??ping\Debug\vc60.pdb

?????文件?????167984??2008-12-29?13:32??ping\Debug\ping.exe

?????文件?????443392??2008-12-29?13:32??ping\Debug\ping.pdb

?????文件??????11439??2008-12-26?18:40??ping\Debug\StdAfx.obj

?????文件?????198044??2008-12-29?13:32??ping\Debug\ping.ilk

?????文件??????50290??2008-12-29?13:32??ping\Debug\ping.obj

?????目錄??????????0??2009-01-03?15:37??ping\Debug

?????目錄??????????0??2009-01-03?15:37??ping

?????文件?????123904??2009-06-18?19:44??2008552257391610.doc

-----------?---------??----------?-----??----

??????????????1730127????????????????????21