<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>ip::multicast::join_group</title> <link rel="stylesheet" href="../../boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2"> <link rel="start" href="../../index.html" title="Asio"> <link rel="up" href="../reference.html" title="Reference"> <link rel="prev" href="ip__multicast__hops.html" title="ip::multicast::hops"> <link rel="next" href="ip__multicast__leave_group.html" title="ip::multicast::leave_group"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="ip__multicast__hops.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="ip__multicast__leave_group.html"><img src="../../next.png" alt="Next"></a> </div> <div class="section" lang="en"> <div class="titlepage"><div><div><h3 class="title"> <a name="asio.reference.ip__multicast__join_group"></a><a class="link" href="ip__multicast__join_group.html" title="ip::multicast::join_group">ip::multicast::join_group</a> </h3></div></div></div> <p> <a class="indexterm" name="id1039044"></a> Socket option to join a multicast group on a specified interface. </p> <pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">implementation_defined</span> <span class="identifier">join_group</span><span class="special">;</span> </pre> <p> Implements the IPPROTO_IP/IP_ADD_MEMBERSHIP socket option. </p> <a name="asio.reference.ip__multicast__join_group.examples"></a><h5> <a name="id1039091"></a> <a class="link" href="ip__multicast__join_group.html#asio.reference.ip__multicast__join_group.examples">Examples</a> </h5> <p> Setting the option to join a multicast group: </p> <pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">);</span> <span class="special">...</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">address</span> <span class="identifier">multicast_address</span> <span class="special">=</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">address</span><span class="special">::</span><span class="identifier">from_string</span><span class="special">(</span><span class="string">"225.0.0.1"</span><span class="special">);</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">multicast</span><span class="special">::</span><span class="identifier">join_group</span> <span class="identifier">option</span><span class="special">(</span><span class="identifier">multicast_address</span><span class="special">);</span> <span class="identifier">socket</span><span class="special">.</span><span class="identifier">set_option</span><span class="special">(</span><span class="identifier">option</span><span class="special">);</span> </pre> <a name="asio.reference.ip__multicast__join_group.requirements"></a><h5> <a name="id1039339"></a> <a class="link" href="ip__multicast__join_group.html#asio.reference.ip__multicast__join_group.requirements">Requirements</a> </h5> <p> <span class="bold"><strong>Header: </strong></span><code class="literal">asio/ip/multicast.hpp</code> </p> <p> <span class="bold"><strong>Convenience header: </strong></span><code class="literal">asio.hpp</code> </p> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 Christopher M. Kohlhoff<p> Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="ip__multicast__hops.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="ip__multicast__leave_group.html"><img src="../../next.png" alt="Next"></a> </div> </body> </html>