接收的函数：

int CIcmp::Receive(LPSTR pIcmpBuffer, int IcmpBufferSize)
{
LPSOCKADDR pRcvSockAddr = (LPSOCKADDR)&rcvSockAddr;

int Result;
int RcvIpHdrLen;

icmpPingReceivedAt = GetTickCount();

icmpCurId = 0;

rcvSockAddr.sin_family = AF_INET;
rcvSockAddr.sin_addr.s_addr = INADDR_ANY;
rcvSockAddr.sin_port = 0;

RcvIpHdrLen = sizeof rcvSockAddr;

Result = recvfrom (icmpSocket,
pIcmpBuffer,
IcmpBufferSize,
0,
pRcvSockAddr,
&RcvIpHdrLen);

if (Result == SOCKET_ERROR)
{
icmpSocketError = WSAGetLastError();
icmpSocketErrorMod = 1;
DisplayError ("Receive","CIcmp::Receive");
return Result;
}

icmpRcvLen = Result;

pIpHeader = (LPIpHeader)pIcmpBuffer;

RcvIpHdrLen = pIpHeader->HeaderLength * 4;
if (Result < RcvIpHdrLen + ICMP_MIN)
{
//
// Too few bytes received
//
MessageBox(NULL,
"Short message!",
"CIcmp::Receive",
MB_OK|MB_SYSTEMMODAL);
icmpSocketErrorMod = 2;
return Result;
}

pIcmpHeader = (LPIcmpHeader)(pIcmpBuffer + RcvIpHdrLen);

icmpCurId = pIcmpHeader->IcmpId;
icmpRoundTripTime = icmpPingReceivedAt - pIcmpHeader->IcmpTimestamp;

if (pIcmpHeader->IcmpType != ICMP_ECHOREPLY)
{
//
// Not an echo response!
//
return Result;
}

icmpCurSeq = pIcmpHeader->IcmpSeq;

return Result;
}

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