Sender.hpp Example File

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    #ifndef SENDER_HPP
    #define SENDER_HPP

    #include <QtCore/QObject>
    #include <QtNetwork/QHostAddress>

    class QTimer;
    class QUdpSocket;

    /**
     * The Sender class sends UDP multicast datagrams every second and makes a status
     * message available to the UI via the 'status' property.
     * The TTL of the datagrams can be changed by the user through the 'ttl' property.
     */
    class Sender : public QObject
    {
        Q_OBJECT

        // The property that makes the status message available to the UI
        Q_PROPERTY(QString status READ status NOTIFY statusChanged)

        // The property that allows the user to change the TTL of the datagrams
        Q_PROPERTY(QString ttl READ ttl WRITE setTtl NOTIFY ttlChanged)

    public:
        Sender(QObject *parent = 0);

    public Q_SLOTS:
        // This method is called when the user clicks the 'Start' button in the UI
        void startSending();

    Q_SIGNALS:
        // The change notification signal of the properties
        void statusChanged();
        void ttlChanged();

    private Q_SLOTS:
        // This method is called every second to send the next multicast datagram
        void sendDatagram();

    private:
        // The accessor methods of the properties
        QString status() const;
        QString ttl() const;
        void setTtl(const QString &ttl);

        // The UDP socket object
        QUdpSocket *m_udpSocket;

        // The timer that triggers the sending of the multicast datagrams
        QTimer *m_timer;

        // The multicast address
        QHostAddress m_groupAddress;

        // A counter for the number of sent datagrams
        int m_messageNo;

        // The status message
        QString m_status;

        // The time-to-live that is used for the datagrams
        int m_ttl;
    };

    #endif