winpcap(windows packet capture)是windows平台下一个免费，公共的网络访问系统。开发winpcap这个项目的目的在于为win32应用程序提供访问网络底层的能力。它用于windows系统下的直接的网络编程。(WinPcap (Windows packet capture) is a free, public network access system under the windows platform. The purpose of developing the WinPcap project is to provide access to the underlying capabilities of the network for Win32 applications. It is used for direct network programming under the windows system.)