用c++编写ping的相关操作需要哪些函数？

急求相关函数，祝您健康幸福！！

答案：
#include "stdafx.h"
#include "ping.h"
//#include "main.h"
//extern STL_DEVINFO g_StuDevInfo;
extern HANDLE g_hEventMainExit;  //全局退出标记
CPing::CPing()
{
 m_nID = 0;
}
bool CPing::Ping(UINT nRetries,LPCSTR pstrHost,HWND hWnd)
{
 SOCKET   rawSocket;
 LPHOSTENT lpHost;
 UINT   nLoop;
 int       nRet;
 struct    sockaddr_in saDest;
 struct    sockaddr_in saSrc;
 DWORD   dwTimeSent;
// DWORD   dwElapsed;
 u_char    cTTL;

 m_hWnd = hWnd;
 CString str;
 ASSERT(IsWindow(hWnd));
 //创建一个Raw套节字
 rawSocket = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
 if (rawSocket == SOCKET_ERROR) 
 {
  WSAError("socket()");
  return false;
 }
 
 //获得主机信息
 lpHost = gethostbyname(pstrHost);
 if (lpHost == NULL)
 {
  str.Format("Host not found: %s", pstrHost);
  TRACE("%s\n",str);
//  ::PostMessage(m_hWnd,WM_MSG_STATUS, 0, (LPARAM) AllocBuffer(str));
//  ::PostMessage(m_hWnd,WM_PING_END, 0, 0);
  return false;
 }
 
 //构造目标套节字地址信息
 saDest.sin_addr.s_addr = *((u_long FAR *) (lpHost->h_addr));
 saDest.sin_family = AF_INET;
 saDest.sin_port = 0;
 //告诉用户我们现在的工作
// str.Format("Pinging %s [%s] with %d bytes of data:",
//    pstrHost,
//    inet_ntoa(saDest.sin_addr),
//    REQ_DATASIZE);
// ::PostMessage(m_hWnd,WM_MSG_STATUS, 1, (LPARAM) AllocBuffer(str));
 bool bPingSucc = false;
 //多次ping
 for (nLoop = 0; nLoop < nRetries; nLoop++)
 {
  if (WAIT_TIMEOUT != WaitForSingleObject(g_hEventMainExit,NULL))
  {
   TRACE("CPing g_hEventMainExit 退出系统!\n");
   break;
  }
  //发送ICMP回应请求
  SendEchoRequest(rawSocket, &saDest);
  nRet = WaitForEchoReply(rawSocket);
  if (nRet == SOCKET_ERROR)
  {
   WSAError("select()");
   break;
  }
  if (!nRet)
  {
//    str.Format("Request Timed Out");
//    ::PostMessage(m_hWnd,WM_MSG_STATUS, 3, (LPARAM) AllocBuffer(str));
  }
  else
  {
   //获得回应
   dwTimeSent = RecvEchoReply(rawSocket, &saSrc, &cTTL);
//   UINT nID = RecvEchoReply(rawSocket, &saSrc, &cTTL);
   if (saDest.sin_addr.s_addr == saSrc.sin_addr.s_addr)
   {
//     if (g_StuDevInfo.find(nID) != g_StuDevInfo.end() && nID >= 0)
//     {
//      g_StuDevInfo[nID].bNetConnected = TRUE;
//     }
    bPingSucc = true;
    break;
   }
//    else
//    {
//     if (g_StuDevInfo.find(nID) != g_StuDevInfo.end() && nID >= 0)
//     {
//      g_StuDevInfo[nID].bNetConnected = TRUE;
//     }
//    }
   //计算时间
//   dwElapsed = GetTickCount() - dwTimeSent;
//    str.Format("Reply[%d] from: %s: bytes=%d time=%ldms TTL=%d", 
//     nLoop+1,
//        inet_ntoa(saSrc.sin_addr), 
//        REQ_DATASIZE,
//        dwElapsed,
//        cTTL);
// 
//    ::PostMessage(m_hWnd,WM_MSG_STATUS, 2, (LPARAM) AllocBuffer(str));
//   Sleep(1000);
  }
 }
 
// ::PostMessage(m_hWnd,WM_PING_END, 0, 1);
 nRet = closesocket(rawSocket);
 if (nRet == SOCKET_ERROR)
  WSAError("closesocket()");
 return bPingSucc;
}
//发送ICMPECHO数据包请求
int CPing::SendEchoRequest(SOCKET s,LPSOCKADDR_IN lpstToAddr) 
{
 static ECHOREQUEST echoReq;
 static nId = 1;
 static nSeq = 1;
 int nRet;
 //构造回应请求
 echoReq.icmpHdr.Type  = ICMP_ECHOREQ;
 echoReq.icmpHdr.Code  = 0;
 echoReq.icmpHdr.Checksum = 0;
 echoReq.icmpHdr.ID   = nId++;
 echoReq.icmpHdr.Seq   = nSeq++;
//  for (nRet = 0; nRet < REQ_DATASIZE; nRet++)
//   echoReq.cData[nRet] = ' '+nRet;
// memset(echoReq.cData,NULL,sizeof(echoReq.cData));
// sprintf(echoReq.cData,"!@#%d",m_nID);
 //保存发送时间
 echoReq.dwTime    = GetTickCount();
 echoReq.icmpHdr.Checksum = in_cksum((u_short *)&echoReq, sizeof(ECHOREQUEST));
 //发送请求
 nRet = sendto(s,      
     (LPSTR)&echoReq,   
     sizeof(ECHOREQUEST),
     0,       
     (LPSOCKADDR)lpstToAddr, 
     sizeof(SOCKADDR_IN));   
 if (nRet == SOCKET_ERROR) 
  WSAError("sendto()");
 return (nRet);
}
//接收ICMPECHO数据包回应
DWORD CPing::RecvEchoReply(SOCKET s, LPSOCKADDR_IN lpsaFrom, u_char *pTTL) 
{
 ECHOREPLY echoReply;
 int nRet;
 int nAddrLen = sizeof(struct sockaddr_in);
 //接收请求回应
 nRet = recvfrom(s,     
     (LPSTR)&echoReply, 
     sizeof(ECHOREPLY), 
     0,     
     (LPSOCKADDR)lpsaFrom,
     &nAddrLen);   
 //检查返回值
 if (nRet == SOCKET_ERROR) 
  WSAError("recvfrom()");
// UINT nID;
//  if (strncmp(echoReply.echoRequest.cData,"!@#",3) == 0)
//  {
//   nID = atoi(echoReply.echoRequest.cData + 3);
//  }
//  else
//  {
//   nID = -1;
//  }
 //返回发送的时间
 *pTTL = echoReply.ipHdr.TTL;
// return nID;
 return(echoReply.echoRequest.dwTime);     
}
//等待回应
int CPing::WaitForEchoReply(SOCKET s)
{
 struct timeval Timeout;
 fd_set readfds;
 readfds.fd_count = 1;
 readfds.fd_array[0] = s;
 Timeout.tv_sec = 1;
    Timeout.tv_usec = 0;
 return(select(1, &readfds, NULL, NULL, &Timeout));
}
//错误处理
void CPing::WSAError(LPCSTR lpMsg)
{
 CString strMsg;
 strMsg.Format("%s - WSAError: %ld",lpMsg,WSAGetLastError()); 
 //发送报错信息
 TRACE("CPing::%s\n",strMsg);
// ::PostMessage(m_hWnd,WM_MSG_STATUS, 0, (LPARAM) AllocBuffer(strMsg));
}
//转换地址
u_short CPing::in_cksum(u_short *addr, int len)
{
 register int nleft = len;
 register u_short *w = addr;
 register u_short answer;
 register int sum = 0;
 while( nleft > 1 )  {
  sum += *w++;
  nleft -= 2;
 }
 if( nleft == 1 ) {
  u_short u = 0;
  *(u_char *)(&u) = *(u_char *)w ;
  sum += u;
 }
 sum = (sum >> 16) + (sum & 0xffff); 
 sum += (sum >> 16);   
 answer = ~sum;    
 return (answer);
}

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