ceph/src/boost/libs/asio/example/cpp03/tutorial/daytime1/client.cpp

   1 //
   2 // client.cpp
   3 // ~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 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::tcp;
  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     tcp::resolver resolver(io_context);
  30     tcp::resolver::results_type endpoints =
  31       resolver.resolve(argv[1], "daytime");
  32
  33     tcp::socket socket(io_context);
  34     boost::asio::connect(socket, endpoints);
  35
  36     for (;;)
  37     {
  38       boost::array<char, 128> buf;
  39       boost::system::error_code error;
  40
  41       size_t len = socket.read_some(boost::asio::buffer(buf), error);
  42
  43       if (error == boost::asio::error::eof)
  44         break; // Connection closed cleanly by peer.
  45       else if (error)
  46         throw boost::system::system_error(error); // Some other error.
  47
  48       std::cout.write(buf.data(), len);
  49     }
  50   }
  51   catch (std::exception& e)
  52   {
  53     std::cerr << e.what() << std::endl;
  54   }
  55
  56   return 0;
  57 }