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# multicast/sender.cpp

    #include <iostream>
    #include <sstream>
    #include <string>
    #include <boost/asio.hpp>
    #include "boost/bind.hpp"
    #include "boost/date_time/posix_time/posix_time_types.hpp"

    const short multicast_port = 30001;
    const int max_message_count = 10;

    class sender
    {
    public:
      sender(boost::asio::io_service& io_service,
          const boost::asio::ip::address& multicast_address)
        : endpoint_(multicast_address, multicast_port),
          socket_(io_service, endpoint_.protocol()),
          timer_(io_service),
          message_count_(0)
      {
        std::ostringstream os;
        os << "Message " << message_count_++;
        message_ = os.str();

        socket_.async_send_to(
            boost::asio::buffer(message_), endpoint_,
            boost::bind(&sender::handle_send_to, this,
              boost::asio::placeholders::error));
      }

      void handle_send_to(const boost::asio::error& error)
      {
        if (!error && message_count_ < max_message_count)
        {
          timer_.expires_from_now(boost::posix_time::seconds(1));
          timer_.async_wait(
              boost::bind(&sender::handle_timeout, this,
                boost::asio::placeholders::error));
        }
      }

      void handle_timeout(const boost::asio::error& error)
      {
        if (!error)
        {
          std::ostringstream os;
          os << "Message " << message_count_++;
          message_ = os.str();

          socket_.async_send_to(
              boost::asio::buffer(message_), endpoint_,
              boost::bind(&sender::handle_send_to, this,
                boost::asio::placeholders::error));
        }
      }

    private:
      boost::asio::ip::udp::endpoint endpoint_;
      boost::asio::ip::udp::socket socket_;
      boost::asio::deadline_timer timer_;
      int message_count_;
      std::string message_;
    };

    int main(int argc, char* argv[])
    {
      try
      {
        if (argc != 2)
        {
          std::cerr << "Usage: sender <multicast_address>\n";
          std::cerr << "  For IPv4, try:\n";
          std::cerr << "    sender 239.255.0.1\n";
          std::cerr << "  For IPv6, try:\n";
          std::cerr << "    sender ff31::8000:1234\n";
          return 1;
        }

        boost::asio::io_service io_service;
        sender s(io_service, boost::asio::ip::address::from_string(argv[1]));
        io_service.run();
      }
      catch (boost::asio::error& e)
      {
        std::cerr << e << "\n";
      }
      catch (std::exception& e)
      {
        std::cerr << "Exception: " << e.what() << "\n";
      }

      return 0;
    }

| Copyright © 2003 - 2006 Christopher M. Kohlhoff