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1 | // |
2 | // server.cpp | |
3 | // ~~~~~~~~~~ | |
4 | // | |
b32b8144 | 5 | // Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
7c673cae FG |
6 | // |
7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | ||
11 | #include <ctime> | |
12 | #include <iostream> | |
13 | #include <string> | |
14 | #include <boost/array.hpp> | |
15 | #include <boost/bind.hpp> | |
16 | #include <boost/shared_ptr.hpp> | |
17 | #include <boost/asio.hpp> | |
18 | ||
19 | using boost::asio::ip::udp; | |
20 | ||
21 | std::string make_daytime_string() | |
22 | { | |
23 | using namespace std; // For time_t, time and ctime; | |
24 | time_t now = time(0); | |
25 | return ctime(&now); | |
26 | } | |
27 | ||
28 | class udp_server | |
29 | { | |
30 | public: | |
b32b8144 FG |
31 | udp_server(boost::asio::io_context& io_context) |
32 | : socket_(io_context, udp::endpoint(udp::v4(), 13)) | |
7c673cae FG |
33 | { |
34 | start_receive(); | |
35 | } | |
36 | ||
37 | private: | |
38 | void start_receive() | |
39 | { | |
40 | socket_.async_receive_from( | |
41 | boost::asio::buffer(recv_buffer_), remote_endpoint_, | |
42 | boost::bind(&udp_server::handle_receive, this, | |
43 | boost::asio::placeholders::error, | |
44 | boost::asio::placeholders::bytes_transferred)); | |
45 | } | |
46 | ||
47 | void handle_receive(const boost::system::error_code& error, | |
48 | std::size_t /*bytes_transferred*/) | |
49 | { | |
b32b8144 | 50 | if (!error) |
7c673cae FG |
51 | { |
52 | boost::shared_ptr<std::string> message( | |
53 | new std::string(make_daytime_string())); | |
54 | ||
55 | socket_.async_send_to(boost::asio::buffer(*message), remote_endpoint_, | |
56 | boost::bind(&udp_server::handle_send, this, message, | |
57 | boost::asio::placeholders::error, | |
58 | boost::asio::placeholders::bytes_transferred)); | |
59 | ||
60 | start_receive(); | |
61 | } | |
62 | } | |
63 | ||
64 | void handle_send(boost::shared_ptr<std::string> /*message*/, | |
65 | const boost::system::error_code& /*error*/, | |
66 | std::size_t /*bytes_transferred*/) | |
67 | { | |
68 | } | |
69 | ||
70 | udp::socket socket_; | |
71 | udp::endpoint remote_endpoint_; | |
72 | boost::array<char, 1> recv_buffer_; | |
73 | }; | |
74 | ||
75 | int main() | |
76 | { | |
77 | try | |
78 | { | |
b32b8144 FG |
79 | boost::asio::io_context io_context; |
80 | udp_server server(io_context); | |
81 | io_context.run(); | |
7c673cae FG |
82 | } |
83 | catch (std::exception& e) | |
84 | { | |
85 | std::cerr << e.what() << std::endl; | |
86 | } | |
87 | ||
88 | return 0; | |
89 | } |