异步通知主窗口：

int CIcmp::SetAsynchNotification(HWND hWnd, unsigned int Message, long Events)
{
　int Result = WSAAsyncSelect (icmpSocket,hWnd, Message, Events);
　if (Result == SOCKET_ERROR)
　{
　　icmpSocketError = WSAGetLastError();
　　icmpSocketErrorMod = 1;
　　icmpSocket = INVALID_SOCKET;
　}
　return Result;
}

　　设置TTL：

int CIcmp::SetTTL(int TTL)
{
　int Result;
　Result = setsockopt (icmpSocket, IPPROTO_IP, IP_TTL, (LPSTR)&TTL, sizeof(int));

　if (Result == SOCKET_ERROR)
　{
　　icmpSocketErrorMod = 1;
　　icmpSocketError = WSAGetLastError();
　}
　return Result;
}

　　Ping命令的函数：

int CIcmp::Ping (LPSTR pIcmpBuffer, int DataLen)
{
　int Result;
　int IcmpBufferSize = DataLen + IcmpHeaderLength;
　pIcmpHeader = (LPIcmpHeader)pIcmpBuffer;

　memset (pIcmpBuffer, 'E', IcmpBufferSize);
　memset (pIcmpHeader, 0, IcmpHeaderLength);

　pIcmpHeader->IcmpType = ICMP_ECHO;
　pIcmpHeader->IcmpCode = 0;
　pIcmpHeader->IcmpChecksum = 0;
　pIcmpHeader->IcmpId = icmpCurId;
　pIcmpHeader->IcmpSeq = icmpCurSeq;
　pIcmpHeader->IcmpTimestamp = GetCurrentTime();

　pIcmpHeader->IcmpChecksum = IcmpChecksum ((USHORT FAR *)pIcmpBuffer,IcmpBufferSize);

　icmpPingSentAt = GetCurrentTime();
　Result = sendto (icmpSocket, pIcmpBuffer, IcmpBufferSize, 0, (LPSOCKADDR)&icmpSockAddr, sizeof icmpSockAddr);

　if (Result == SOCKET_ERROR)
　{
　　icmpSocketError = WSAGetLastError();
　　icmpSocketErrorMod = 1;
　}
　return Result;
}

　　(参考链接: http://dev.yesky.com/139/2663639.shtml)