1 //
2 // client.cpp
3 // ~~~~~~~~~~
4 //
5 // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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 <iostream>
12 #include <boost/array.hpp>
13 #include <boost/asio.hpp>
14
15 using boost::asio::ip::udp;
16
main(int argc,char * argv[])17 int main(int argc, char* argv[])
18 {
19 try
20 {
21 if (argc != 2)
22 {
23 std::cerr << "Usage: client <host>" << std::endl;
24 return 1;
25 }
26
27 boost::asio::io_context io_context;
28
29 udp::resolver resolver(io_context);
30 udp::endpoint receiver_endpoint =
31 *resolver.resolve(udp::v4(), argv[1], "daytime").begin();
32
33 udp::socket socket(io_context);
34 socket.open(udp::v4());
35
36 boost::array<char, 1> send_buf = {{ 0 }};
37 socket.send_to(boost::asio::buffer(send_buf), receiver_endpoint);
38
39 boost::array<char, 128> recv_buf;
40 udp::endpoint sender_endpoint;
41 size_t len = socket.receive_from(
42 boost::asio::buffer(recv_buf), sender_endpoint);
43
44 std::cout.write(recv_buf.data(), len);
45 }
46 catch (std::exception& e)
47 {
48 std::cerr << e.what() << std::endl;
49 }
50
51 return 0;
52 }
53