doc/html/boost_asio/example/cpp11/echo/blocking_udp_echo_client.cpp – 1.78.0
doc/html/boost_asio/example/cpp11/echo/blocking_udp_echo_client.cpp
// // blocking_udp_echo_client.cpp // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2021 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 <cstdlib> #include <cstring> #include <iostream> #include <boost/asio.hpp> using boost::asio::ip::udp; enum { max_length = 1024 }; int main(int argc, char* argv[]) { try { if (argc != 3) { std::cerr << "Usage: blocking_udp_echo_client <host> <port>n"; return 1; } boost::asio::io_context io_context; udp::socket s(io_context, udp::endpoint(udp::v4(), 0)); udp::resolver resolver(io_context); udp::resolver::results_type endpoints = resolver.resolve(udp::v4(), argv[1], argv[2]); std::cout << "Enter message: "; char request[max_length]; std::cin.getline(request, max_length); size_t request_length = std::strlen(request); s.send_to(boost::asio::buffer(request, request_length), *endpoints.begin()); char reply[max_length]; udp::endpoint sender_endpoint; size_t reply_length = s.receive_from( boost::asio::buffer(reply, max_length), sender_endpoint); std::cout << "Reply is: "; std::cout.write(reply, reply_length); std::cout << "n"; } catch (std::exception& e) { std::cerr << "Exception: " << e.what() << "n"; } return 0; }
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