asio/example/cpp03/tutorial/daytime4/client.cpp
2019-02-17 19:59:39 -10:00

53 lines
1.2 KiB
C++

//
// client.cpp
// ~~~~~~~~~~
//
// Copyright (c) 2003-2019 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)
//
#include <iostream>
#include <boost/array.hpp>
#include <boost/asio.hpp>
using boost::asio::ip::udp;
int main(int argc, char* argv[])
{
try
{
if (argc != 2)
{
std::cerr << "Usage: client <host>" << std::endl;
return 1;
}
boost::asio::io_context io_context;
udp::resolver resolver(io_context);
udp::endpoint receiver_endpoint =
*resolver.resolve(udp::v4(), argv[1], "daytime").begin();
udp::socket socket(io_context);
socket.open(udp::v4());
boost::array<char, 1> send_buf = {{ 0 }};
socket.send_to(boost::asio::buffer(send_buf), receiver_endpoint);
boost::array<char, 128> recv_buf;
udp::endpoint sender_endpoint;
size_t len = socket.receive_from(
boost::asio::buffer(recv_buf), sender_endpoint);
std::cout.write(recv_buf.data(), len);
}
catch (std::exception& e)
{
std::cerr << e.what() << std::endl;
}
return 0;
}