这是一个更加完整的使用libpcap的范例程序，它显把捕获的数据包保存到磁盘。这个程序在Win32和Unix平台下都能编译。Pcap_filter(pf.exe)是一个通用的数据包过滤程序：它的输入参数有数据包的源(可以是物理接口，或是一个文件)，过滤器和一个输出文件。它会从源获取数据包，并对它们进行过滤，如果它们符合过滤器的要求，就把它们保存到输出文件，直到按下Ctrl+C，或者整个文件处理完毕。-This is a more complete use of Libpcap examples of procedures, it is sensible to capture data packets are saved to disk. This program can be compiled in Win32 and Unix platform. Pcap_filter (pf.exe) is a common data packet filter program: its input parameters are the source of the packet (can be a physical interface, or a file), filter and an output file. It gets the packet from the source, and to filter them, if they meet the filter requirements, to save them to the output file, until you press Ctrl+C, or the entire document processing.