| // |
| // server.cpp |
| // ~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| // |
| |
| #include <ctime> |
| #include <iostream> |
| #include <string> |
| #include <boost/array.hpp> |
| #include <boost/bind.hpp> |
| #include <boost/shared_ptr.hpp> |
| #include <boost/asio.hpp> |
| |
| using boost::asio::ip::udp; |
| |
| std::string make_daytime_string() |
| { |
| using namespace std; // For time_t, time and ctime; |
| time_t now = time(0); |
| return ctime(&now); |
| } |
| |
| class udp_server |
| { |
| public: |
| udp_server(boost::asio::io_service& io_service) |
| : socket_(io_service, udp::endpoint(udp::v4(), 13)) |
| { |
| start_receive(); |
| } |
| |
| private: |
| void start_receive() |
| { |
| socket_.async_receive_from( |
| boost::asio::buffer(recv_buffer_), remote_endpoint_, |
| boost::bind(&udp_server::handle_receive, this, |
| boost::asio::placeholders::error, |
| boost::asio::placeholders::bytes_transferred)); |
| } |
| |
| void handle_receive(const boost::system::error_code& error, |
| std::size_t /*bytes_transferred*/) |
| { |
| if (!error || error == boost::asio::error::message_size) |
| { |
| boost::shared_ptr<std::string> message( |
| new std::string(make_daytime_string())); |
| |
| socket_.async_send_to(boost::asio::buffer(*message), remote_endpoint_, |
| boost::bind(&udp_server::handle_send, this, message, |
| boost::asio::placeholders::error, |
| boost::asio::placeholders::bytes_transferred)); |
| |
| start_receive(); |
| } |
| } |
| |
| void handle_send(boost::shared_ptr<std::string> /*message*/, |
| const boost::system::error_code& /*error*/, |
| std::size_t /*bytes_transferred*/) |
| { |
| } |
| |
| udp::socket socket_; |
| udp::endpoint remote_endpoint_; |
| boost::array<char, 1> recv_buffer_; |
| }; |
| |
| int main() |
| { |
| try |
| { |
| boost::asio::io_service io_service; |
| udp_server server(io_service); |
| io_service.run(); |
| } |
| catch (std::exception& e) |
| { |
| std::cerr << e.what() << std::endl; |
| } |
| |
| return 0; |
| } |