for(int i=0;i<3;i++) {

printf("ping %s..%d\n",inet_ntoa(to.sin_addr),i+1);

FillPackage(buf,dstIP,(u_short)pid);//组装icmp包

if((sock,buf,PACKAGE_SIZE,0,(struct sockaddr *)&to,len) == SOCKET_ERROR)

break;

(&from,0,sizeof(from));

len = sizeof(from);

if( recvfrom(sock,buf,PACKAGE_SIZE,0,(struct sockaddr *)&from,&len) == SOCKET_ERROR)

break;

IPHeader *pIPHdr = (IPHeader *)buf;

ICMPHeader *pICMPHdr = (ICMPHeader *)(buf+sizeof(IPHeader));

if(pICMPHdr->id == htons((u_short)pid) && pICMPHdr->seq == htons((u_short)pid) && pICMPHdr->type == ICMP_ECHO_REPLY) {

printf("Echo Reply From %s,\n",inet_ntoa(.sin_addr));

}

}