使用sniffer技术实现网络抓包，次程序功能简单，仅仅是sniffer网络嗅探的第一步，数据包监听。将网络接口卡设置成“混杂”模式，实现对通过该接口卡的数据包的监听。-The use of sniffer technology PacketCapture, sub-program features simple, just the first step in sniffer network sniffer, packet monitoring. The network interface card set to " promiscuous"　mode to achieve the adoption of the interface card packet listener.