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#include <ctime> #include <iostream> #include <string> #include <boost/array.hpp> #include <boost/asio.hpp> using boost::asio::ip::udp; std::string make_daytime_string() { using namespace std; // For time_t, time and ctime; time_t now = time(0); return ctime(&now); } int main() { try { boost::asio::io_service io_service; udp::socket socket(io_service, udp::endpoint(udp::v4(), 13)); for (;;) { boost::array<char, 1> recv_buf; udp::endpoint remote_endpoint; boost::asio::error error; socket.receive_from(boost::asio::buffer(recv_buf), remote_endpoint, 0, boost::asio::assign_error(error)); if (error && error != boost::asio::error::message_size) throw error; std::string message = make_daytime_string(); socket.send_to(boost::asio::buffer(message), remote_endpoint, 0, boost::asio::ignore_error()); } } catch (std::exception& e) { std::cerr << e.what() << std::endl; } return 0; }
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