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<html><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><!--Converted with jLaTeX2HTML 2002 (1.62) JA patch-1.4patched version by: Kenshi Muto, Debian Project.LaTeX2HTML 2002 (1.62),original version by: Nikos Drakos, CBLU, University of Leeds* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan* with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --><HTML><HEAD><TITLE>12.2 Packet Classes</TITLE><META NAME="description" CONTENT="12.2 Packet Classes"><META NAME="keywords" CONTENT="everything"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"><META NAME="Generator" CONTENT="jLaTeX2HTML v2002 JA patch-1.4"><META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"><LINK REL="STYLESHEET" HREF="everything.css" tppabs="http://www.isi.edu/nsnam/ns/doc/everything.css"><LINK REL="next" HREF="node136.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node136.html"><LINK REL="previous" HREF="node128.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node128.html"><LINK REL="up" HREF="node127.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node127.html"><LINK REL="next" HREF="node132.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node132.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html3302" HREF="node132.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node132.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html3296" HREF="node127.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node127.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html3290" HREF="node130.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node130.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html3298" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html"><IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="file:/usr/share/latex2html/icons/contents.png"></A> <A NAME="tex2html3300" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html"><IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="file:/usr/share/latex2html/icons/index.png"></A> <BR><B> Next:</B> <A NAME="tex2html3303" HREF="node132.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node132.html">12.2.1 The Packet Class</A><B> Up:</B> <A NAME="tex2html3297" HREF="node127.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node127.html">12. Packet Headers and</A><B> Previous:</B> <A NAME="tex2html3291" HREF="node130.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node130.html">12.1.2 Selectively Including Packet</A>   <B> <A NAME="tex2html3299" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html3301" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H1><A NAME="SECTION03920000000000000000"></A><A NAME="sec:packetclasses"></A><BR>12.2 Packet Classes</H1><P>There are four C++ classes relevant to the handling of packetsand packet headers in general: <TT>Packet</TT>, <TT>p_info</TT><TT>PacketHeader</TT>, and <TT>PacketHeaderManager</TT>.The Packet../ns-2/packet.hdefines the type for all packets in the simulation;it is a subclass of <TT>Event</TT> so that packets maybe scheduled (e.g. for later arrival at some queue).The packet_info../ns-2/packet.h holds all textrepresentations for packet names.The PacketHeader../ns-2/packet.h provides a base class forany packet header configured into the simulation.It essentially provides enough internal state to locate any particular packetheader in the collection of packet headers present in any given packet.The PacketHeaderManager../ns-2/packet.hdefines a class used to collect and manage currently-configured headers.It is invoked by a method available to OTcl at simulation configurationtime to enable some subset of the compiled-in packet headers.<P><BR><HR><!--Table of Child-Links--><A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A><UL><LI><A NAME="tex2html3304" HREF="node132.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node132.html">12.2.1 The Packet Class</A><LI><A NAME="tex2html3305" HREF="node133.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node133.html">12.2.2 p_info Class</A><LI><A NAME="tex2html3306" HREF="node134.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node134.html">12.2.3 The hdr_cmn Class</A><LI><A NAME="tex2html3307" HREF="node135.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node135.html">12.2.4 The PacketHeaderManager Class</A></UL><!--End of Table of Child-Links--><BR><HR><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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