daytime_client.cpp

//
// daytime_client.cpp
// ~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#define BOOST_ASIO_NO_DEPRECATED
#include <boost/config.hpp>

#include <boost/array.hpp>
#include <boost/asio.hpp>

#include <iostream>

using boost::asio::ip::tcp;

int main(int argc, char* argv[])
{
    try {
        if (argc != 2) {
            std::cerr << "Usage: client <host>" << std::endl;
            return 0; // NOTE: OK for ctest! CK
        }

        boost::asio::io_context io_context;

        tcp::resolver resolver(io_context);
        tcp::resolver::results_type endpoints =
            resolver.resolve(argv[1], "daytime");

        tcp::socket socket(io_context);
        boost::asio::connect(socket, endpoints);

        for (;;) {
            boost::array<char, 128> buf = { 0 };
            boost::system::error_code error;

            size_t len = socket.read_some(boost::asio::buffer(buf), error);

            if (error == boost::asio::error::eof)
                break; // Connection closed cleanly by peer.
            else if (error)
                throw boost::system::system_error(error); // Some other error.

            std::cout.write(buf.data(), len);
        }
    } catch (std::exception& e) {
        std::cerr << e.what() << std::endl;
        return 1;
    }

    return 0;
}