to get no. of bytes received and sent in cascades bb 10

Question

Im new to cascades programming. Im trying to develop an app that could give me the number of bytes received and sent.
Im using QnetworkSession methods bytesReceived() and bytesWritten() for it, but getting errors.
Any help would be appreciable.

Thanks

Code:

#include "Monitor.hpp"    
#include <bb/cascades/Application>
#include <bb/cascades/QmlDocument>
#include <bb/cascades/AbstractPane>
#include <QtCore/QFile>
#include <QtNetwork/QNetworkSession>
#include <QtNetwork/QNetworkConfiguration>
#include <QtNetwork/QNetworkConfigurationManager>
using namespace bb::cascades;
QNetworkSession::QNetworkSession ( const QNetworkConfiguration & connectionConfig, QObject * parent = 0 );
Monitor::Monitor(bb::cascades::Application *app)
: QObject(app)
{
    QNetworkSession qnetworksession;
    // create scene document from main.qml asset
    // set parent to created document to ensure it exists for the whole application lifetime
    QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);
    qml->setContextProperty("app", this);
    // create root object for the UI
    AbstractPane *root = qml->createRootObject<AbstractPane>();
    // set created root object as a scene
    app->setScene(root);
}

quint64 Monitor::Received() const
{
    quint64 rec=qnetworksession.bytesReceived ();
    return(rec);
}


quint64 Monitor::Sent() const
{
    quint64 sen=qnetworksession.bytesWritten ();
    return(sen);
}