    // The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
    /*

        This is an example illustrating the use of the sockets and
        server components from the dlib C++ Library.

        This is a simple echo server.  It listens on port 1234 for incoming
        connections and just echos back any data it receives.

    */

    #include <dlib/sockets.h>
    #include <dlib/server.h>
    #include <iostream>

    using namespace dlib;
    using namespace std;

    class serv : public server
    {
        void on_connect  (
            connection& con
        )
        {
            char ch;
            while (con.read(&ch,1) > 0)
            {
                // we are just reading one char at a time and writing it back
                // to the connection.  If there is some problem writing the char
                // then we quit the loop.
                if (con.write(&ch,1) != 1)
                    break;
            }
        }

    };

    int main()
    {
        try
        {
            serv our_server;

            // set up the server object we have made
            our_server.set_listening_port(1234);
            // Tell the server to begin accepting connections.
            our_server.start_async();

            cout << "Press enter to end this program" << endl;
            cin.get();
        }
        catch (exception& e)
        {
            cout << e.what() << endl;
        }
    }