140 lines
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140 lines
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<div class="titlepage"><div><div><h4 class="title">
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<a name="boost_asio.tutorial.tutdaytime6.src"></a><a class="link" href="src.html" title="Source listing for Daytime.6">Source listing
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for Daytime.6</a>
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</h4></div></div></div>
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<pre class="programlisting">//
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// server.cpp
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// ~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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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 http://www.boost.org/LICENSE_1_0.txt)
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//
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#include <ctime>
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#include <iostream>
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#include <string>
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#include <boost/array.hpp>
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#include <boost/bind/bind.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/asio.hpp>
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using boost::asio::ip::udp;
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std::string make_daytime_string()
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{
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using namespace std; // For time_t, time and ctime;
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time_t now = time(0);
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return ctime(&now);
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}
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class udp_server
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{
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public:
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udp_server(boost::asio::io_context& io_context)
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: socket_(io_context, udp::endpoint(udp::v4(), 13))
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{
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start_receive();
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}
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private:
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void start_receive()
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{
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socket_.async_receive_from(
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boost::asio::buffer(recv_buffer_), remote_endpoint_,
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boost::bind(&udp_server::handle_receive, this,
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boost::asio::placeholders::error,
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boost::asio::placeholders::bytes_transferred));
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}
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void handle_receive(const boost::system::error_code& error,
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std::size_t /*bytes_transferred*/)
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{
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if (!error)
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{
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boost::shared_ptr<std::string> message(
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new std::string(make_daytime_string()));
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socket_.async_send_to(boost::asio::buffer(*message), remote_endpoint_,
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boost::bind(&udp_server::handle_send, this, message,
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boost::asio::placeholders::error,
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boost::asio::placeholders::bytes_transferred));
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start_receive();
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}
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}
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void handle_send(boost::shared_ptr<std::string> /*message*/,
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const boost::system::error_code& /*error*/,
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std::size_t /*bytes_transferred*/)
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{
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}
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udp::socket socket_;
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udp::endpoint remote_endpoint_;
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boost::array<char, 1> recv_buffer_;
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};
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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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udp_server server(io_context);
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io_context.run();
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}
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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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Return to <a class="link" href="../tutdaytime6.html" title="Daytime.6 - An asynchronous UDP daytime server">Daytime.6 - An
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asynchronous UDP daytime server</a>
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</p>
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</div>
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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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