1 //
2 // blocking_udp_echo_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 <cstdlib>
12 #include <cstring>
13 #include <iostream>
14 #include <boost/asio.hpp>
15
16 using boost::asio::ip::udp;
17
18 enum { max_length = 1024 };
19
main(int argc,char * argv[])20 int main(int argc, char* argv[])
21 {
22 try
23 {
24 if (argc != 3)
25 {
26 std::cerr << "Usage: blocking_udp_echo_client <host> <port>\n";
27 return 1;
28 }
29
30 boost::asio::io_context io_context;
31
32 udp::socket s(io_context, udp::endpoint(udp::v4(), 0));
33
34 udp::resolver resolver(io_context);
35 udp::resolver::results_type endpoints =
36 resolver.resolve(udp::v4(), argv[1], argv[2]);
37
38 using namespace std; // For strlen.
39 std::cout << "Enter message: ";
40 char request[max_length];
41 std::cin.getline(request, max_length);
42 size_t request_length = strlen(request);
43 s.send_to(boost::asio::buffer(request, request_length), *endpoints.begin());
44
45 char reply[max_length];
46 udp::endpoint sender_endpoint;
47 size_t reply_length = s.receive_from(
48 boost::asio::buffer(reply, max_length), sender_endpoint);
49 std::cout << "Reply is: ";
50 std::cout.write(reply, reply_length);
51 std::cout << "\n";
52 }
53 catch (std::exception& e)
54 {
55 std::cerr << "Exception: " << e.what() << "\n";
56 }
57
58 return 0;
59 }
60