windows编程中的PING功能的实现

定义头文件

#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;

定义类

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);
    dwCheckSum = (dwCheckSum >> 16) + (dwCheckSum & 0XFFFF);
    return (USHORT)(~dwCheckSum);
}

继续定义类

BOOL Ping(char* lpDestIP)
{
    SOCKADDR_IN DestSockAddr;
    DestSockAddr.sin_family = AF_INET;
    DestSockAddr.sin_addr.S_un.S_addr = inet_addr(lpDestIP);
    DestSockAddr.sin_port = htons(0);
    char ICMPPack[ICMP_HEADER_SIZE] = {0};
    PICMP_HEADER pICMPHeader = (PICMP_HEADER)ICMPPack;
    pICMPHeader->bType = 8;
    pICMPHeader->bCode = 0;
    pICMPHeader->nId = (USHORT)::GetCurrentProcessId();
    pICMPHeader->nCheckSum = 0;
    pICMPHeader->nTimeStamp = 0;
 
    WORD version = MAKEWORD(2, 2);
    WSADATA wsaData;
    if(WSAStartup(version, &wsaData) != 0)
    {
        printf("WSAStartup error\n");
        return FALSE;
    }
    SOCKET s = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
    int nTime = 1000;
    int ret = ::setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, (char*)&nTime, sizeof(nTime));
    char szRcvBuff[DEF_BUF_SIZE];
    SOCKADDR_IN SourceSockAddr;
    for(int i=0; i<4; i++)
    {
        pICMPHeader->nCheckSum = 0;
        pICMPHeader->nSequence = i;
        pICMPHeader->nTimeStamp = ::GetTickCount();
        pICMPHeader->nCheckSum = GetCheckSum((LPBYTE)(ICMPPack), ICMP_HEADER_SIZE);
        int nRet = ::sendto(s, ICMPPack, ICMP_HEADER_SIZE, 0, (SOCKADDR*)&DestSockAddr, sizeof(DestSockAddr));
        if(nRet == SOCKET_ERROR)
        {
            printf("send error.\n");
            return FALSE;
        }
        int nLen = sizeof(SOCKADDR_IN);
        if(nRet == SOCKET_ERROR)
        {
            int nError = ::WSAGetLastError();
            printf("Recv Error:%d.\n", nError);
            return FALSE;
        }
        nRet = ::recvfrom(s, szRcvBuff,DEF_BUF_SIZE,0,(SOCKADDR*)&SourceSockAddr,&nLen);
        if(nRet == SOCKET_ERROR)
        {
            return FALSE;
        }
         
        PICMP_HEADER pRcvHeader = (PICMP_HEADER)(szRcvBuff + IP_HEADER_SIZE);
        int nTime = ::GetTickCount() - pRcvHeader->nTimeStamp;
        //printf("从目标地址传回: %s bytes=%d time=%dms\n", inet_ntoa(SourceSockAddr.sin_addr), nRet, nTime);
　　　　 //这是返回信息的地方
        ::Sleep(1000);
    }
    closesocket(s);
    WSACleanup();
    return TRUE;
}

直接调用即可，函数返回真则为ping通。

int main()
{
    Ping("192.168.0.1");
    return 0;
}