tip 文件是一种采集和记录 IP 分组内容的文件格式。给定一个tip文件，试编写一个程序，从中读取IP分组记录。分析该文件中的分组，统计共包含多少个IP流。并将每个IP流的IP源/目的地址、协议号、源/目的端口号（若有）、分组的个数、数据量、持续时间等信息。-tip document is an IP packet capture and record the contents of the file format. Given a tip file and try to write a program reads IP packet from records. Analysis of the document in the packet, statistics include total number of IP streams. Each IP flow and IP source destination address, protocol number, source　destination port number (if any), group number, the data volume, duration and other information.