说明：  用winpcap做的抓包程序.winpcap只是建立在spi上的一个控件，利用spi可以自己写协议，处理抓到的包，然后发出去或者发给用户
(WinPcap to do with the capture process. Winpcap is built on the spi a control, the use of spi can write their own agreement, deal with captured packets, and then sent to or distributed to users)