Sender.cpp Example File

    /****************************************************************************
     **
     ** Portions Copyright (C) 2012 Research In Motion Limited.
     ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Research In Motion Ltd. (http://www.rim.com/company/contact/)
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the examples of the BB10 Platform and is derived
     ** from a similar file that is part of the Qt Toolkit.
     **
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Research In Motion, nor the name of Nokia
     **     Corporation and its Subsidiary(-ies), nor the names of its
     **     contributors may be used to endorse or promote products
     **     derived from this software without specific prior written
     **     permission.
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ****************************************************************************/

    #include "Sender.hpp"

    #include <QtCore/QTimer>
    #include <QtNetwork/QUdpSocket>

    Sender::Sender(QObject *parent)
        : QObject(parent)
    {
        /**
         * Initialize the 'status' property with no data, it won't
         * be shown in the UI until the first datagram is sent.
         */
        m_status = "";

        // Create the timer that triggers the broadcast of the datagrams
        m_timer = new QTimer(this);

        /**
         * Create the UDP socket object.
         * Note: In opposite to a TCP socket we don't have to establish a network connection.
         */
        m_udpSocket = new QUdpSocket(this);

        // Initialize the datagram counter
        m_messageNo = 1;

        /**
         * Create a signal/slot connection so that whenever the timer times out, the broadcastDatagram()
         * method is invoked.
         */
        connect(m_timer, SIGNAL(timeout()), this, SLOT(broadcastDatagram()));
    }

    void Sender::startBroadcasting()
    {
        // Start the timer with an interval of 1 second
        m_timer->start(1000);
    }

    void Sender::broadcastDatagram()
    {
        // Update the status message and signal that it has changed
        m_status = tr("%1").arg(m_messageNo);
        emit statusChanged();

        // Assemble the content of the datagram
        const QByteArray datagram = "Broadcast message "
                + QByteArray::number(m_messageNo);

        // Broadcast a datagram with the given content to port 45454
        m_udpSocket->writeDatagram(datagram.data(), datagram.size(),
                QHostAddress::Broadcast, 45454);

        // Increase the datagram counter, so that the next sent datagram will have a different content
        ++m_messageNo;
    }

    QString Sender::status() const
    {
        return m_status;
    }