【非原创】C++实现PING功能源代码

// Ping.cpp : Defines the entry point for the console application.
//
 
#include "stdafx.h"
#define DEF_BUF_SIZE 1024
#define IP_HEADER_SIZE 20
#define ICMP_HEADER_SIZE 12
 
typedef struct _ICMP_HEADER
{
    BYTE bType;        //类型
    BYTE bCode;        //代码
    USHORT nCheckSum;  //校验各
    USHORT nId;        //进程ID
    USHORT nSequence;  //序号
    UINT nTimeStamp;   //时间
}ICMP_HEADER, *PICMP_HEADER;
 
USHORT GetCheckSum(LPBYTE lpBuff, DWORD dwSize)
{
    DWORD dwCheckSum = 0;
    USHORT* lpWord = (USHORT*)lpBuff;
    while(dwSize > 1)
    {
        dwCheckSum += *lpWord++;
        dwSize -= 2;
    }
    if(dwSize ==1)
        dwCheckSum += *((LPBYTE)lpBuff);