asio 0.3.8rc3 | Home | Reference | Tutorial | Examples | Design

Examples |

# echo/blocking_udp_echo_client.cpp

    //
    // blocking_udp_echo_client.cpp
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    //
    // Copyright (c) 2003-2007 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 "asio.hpp"

    using 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;
        }

        asio::io_service io_service;

        udp::socket s(io_service, udp::endpoint(udp::v4(), 0));

        udp::resolver resolver(io_service);
        udp::resolver::query query(udp::v4(), argv[1], argv[2]);
        udp::resolver::iterator iterator = resolver.resolve(query);

        using namespace std; // For strlen.
        std::cout << "Enter message: ";
        char request[max_length];
        std::cin.getline(request, max_length);
        size_t request_length = strlen(request);
        s.send_to(asio::buffer(request, request_length), *iterator);

        char reply[max_length];
        udp::endpoint sender_endpoint;
        size_t reply_length = s.receive_from(
            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;
    }

asio 0.3.8rc3 | Home | Reference | Tutorial | Examples | Design