源代码较简单，适合初学者学习。这的原理是根据新建的原始套接字构造ICMP协议的ECHO数据头，然后分析返回的IP及ICMP的数据头。代码较简单，适合初学者参考。-Source code relatively simple, suitable for beginners to learn. This principle is based on the new socket structure of the original agreement, ECHO data ICMP header, and then analyze the return of the IP and ICMP header data. Code than the simple reference for beginners.