ceph/src/boost/libs/asio/example/cpp03/tutorial/daytime4/client.cpp

   1 //
   2 // client.cpp
   3 // ~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2022 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
  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 }