111 lines
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111 lines
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Daytime.5 - A synchronous UDP daytime server</title>
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<a accesskey="p" href="tutdaytime4/src.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../tutorial.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../boost_asio.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="tutdaytime5/src.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_asio.tutorial.tutdaytime5"></a><a class="link" href="tutdaytime5.html" title="Daytime.5 - A synchronous UDP daytime server">Daytime.5 - A synchronous
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UDP daytime server</a>
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</h3></div></div></div>
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<p>
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This tutorial program shows how to use asio to implement a server application
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with UDP.
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</p>
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<pre class="programlisting">int main()
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{
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try
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{
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boost::asio::io_context io_context;
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</pre>
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<p>
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Create an <a class="link" href="../reference/ip__udp/socket.html" title="ip::udp::socket">ip::udp::socket</a>
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object to receive requests on UDP port 13.
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</p>
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<pre class="programlisting"> udp::socket socket(io_context, udp::endpoint(udp::v4(), 13));
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</pre>
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<p>
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Wait for a client to initiate contact with us. The remote_endpoint object
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will be populated by <a class="link" href="../reference/basic_datagram_socket/receive_from.html" title="basic_datagram_socket::receive_from">ip::udp::socket::receive_from()</a>.
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</p>
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<pre class="programlisting"> for (;;)
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{
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boost::array<char, 1> recv_buf;
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udp::endpoint remote_endpoint;
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socket.receive_from(boost::asio::buffer(recv_buf), remote_endpoint);
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</pre>
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<p>
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Determine what we are going to send back to the client.
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</p>
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<pre class="programlisting"> std::string message = make_daytime_string();
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</pre>
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<p>
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Send the response to the remote_endpoint.
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</p>
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<pre class="programlisting"> boost::system::error_code ignored_error;
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socket.send_to(boost::asio::buffer(message),
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remote_endpoint, 0, ignored_error);
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}
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}
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</pre>
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<p>
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Finally, handle any exceptions.
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</p>
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<pre class="programlisting"> catch (std::exception& e)
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{
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std::cerr << e.what() << std::endl;
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}
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return 0;
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}
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</pre>
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<p>
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See the <a class="link" href="tutdaytime5/src.html" title="Source listing for Daytime.5">full source listing</a>
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</p>
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<p>
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Return to the <a class="link" href="../tutorial.html" title="Tutorial">tutorial index</a>
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</p>
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<p>
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Previous: <a class="link" href="tutdaytime4.html" title="Daytime.4 - A synchronous UDP daytime client">Daytime.4 - A synchronous
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UDP daytime client</a>
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</p>
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<p>
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Next: <a class="link" href="tutdaytime6.html" title="Daytime.6 - An asynchronous UDP daytime server">Daytime.6 - An asynchronous
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UDP daytime server</a>
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</p>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2021 Christopher
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M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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>)
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