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# multicast/receiver.cpp

    #include <iostream>
    #include <string>
    #include <boost/asio.hpp>
    #include "boost/bind.hpp"

    const short multicast_port = 30001;

    class receiver
    {
    public:
      receiver(boost::asio::io_service& io_service,
          const boost::asio::ip::address& listen_address,
          const boost::asio::ip::address& multicast_address)
        : socket_(io_service)
      {
        // Create the socket so that multiple may be bound to the same address.
        boost::asio::ip::udp::endpoint listen_endpoint(
            listen_address, multicast_port);
        socket_.open(listen_endpoint.protocol());
        socket_.set_option(boost::asio::ip::udp::socket::reuse_address(true));
        socket_.bind(listen_endpoint);

        // Join the multicast group.
        socket_.set_option(
            boost::asio::ip::multicast::join_group(multicast_address));

        socket_.async_receive_from(
            boost::asio::buffer(data_, max_length), sender_endpoint_,
            boost::bind(&receiver::handle_receive_from, this,
              boost::asio::placeholders::error,
              boost::asio::placeholders::bytes_transferred));
      }

      void handle_receive_from(const boost::asio::error& error, size_t bytes_recvd)
      {
        if (!error)
        {
          std::cout.write(data_, bytes_recvd);
          std::cout << std::endl;

          socket_.async_receive_from(
              boost::asio::buffer(data_, max_length), sender_endpoint_,
              boost::bind(&receiver::handle_receive_from, this,
                boost::asio::placeholders::error,
                boost::asio::placeholders::bytes_transferred));
        }
      }

    private:
      boost::asio::ip::udp::socket socket_;
      boost::asio::ip::udp::endpoint sender_endpoint_;
      enum { max_length = 1024 };
      char data_[max_length];
    };

    int main(int argc, char* argv[])
    {
      try
      {
        if (argc != 3)
        {
          std::cerr << "Usage: receiver <listen_address> <multicast_address>\n";
          std::cerr << "  For IPv4, try:\n";
          std::cerr << "    receiver 0.0.0.0 239.255.0.1\n";
          std::cerr << "  For IPv6, try:\n";
          std::cerr << "    receiver 0::0 ff31::8000:1234\n";
          return 1;
        }

        boost::asio::io_service io_service;
        receiver r(io_service,
            boost::asio::ip::address::from_string(argv[1]),
            boost::asio::ip::address::from_string(argv[2]));
        io_service.run();
      }
      catch (std::exception& e)
      {
        std::cerr << "Exception: " << e.what() << "\n";
      }

      return 0;
    }

| Copyright © 2003 - 2006 Christopher M. Kohlhoff