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# trackerclient.h Example File
network/torrent/trackerclient.h

        /****************************************************************************
        **
        ** Copyright (C) 2004-2006 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 as published by the Free Software Foundation
        ** and appearing in the file LICENSE.GPL included in the packaging of
        ** this file.  Please review the following information to ensure GNU
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        #ifndef TRACKERCLIENT_H
        #define TRACKERCLIENT_H

        #include <QByteArray>
        #include <QList>
        #include <QObject>
        #include <QHostAddress>
        #include <QHttp>

        #include "metainfo.h"
        #include "torrentclient.h"

        class TorrentClient;

        class TrackerClient : public QObject
        {
            Q_OBJECT
        public:
            TrackerClient(TorrentClient *downloader, QObject *parent = 0);

            void start(const MetaInfo &info);
            void stop();

            inline qint64 uploadCount() const { return uploadedBytes; }
            inline qint64 downloadCount() const { return downloadedBytes; }
            inline void setUploadCount(qint64 bytes) { uploadedBytes = bytes; }
            inline void setDownloadCount(qint64 bytes) { downloadedBytes = bytes; }

        signals:
            void connectionError(QHttp::Error error);

            void failure(const QString &reason);
            void warning(const QString &message);
            void peerListUpdated(const QList<TorrentPeer> &peerList);

            void uploadCountUpdated(qint64 newUploadCount);
            void downloadCountUpdated(qint64 newDownloadCount);

            void stopped();

        protected:
            void timerEvent(QTimerEvent *event);

        private slots:
            void fetchPeerList();
            void httpRequestDone(bool error);

        private:
            TorrentClient *torrentDownloader;

            int requestInterval;
            int requestIntervalTimer;
            QHttp http;
            MetaInfo metaInfo;
            QByteArray trackerId;
            QList<TorrentPeer> peers;
            qint64 uploadedBytes;
            qint64 downloadedBytes;
            qint64 length;

            bool firstTrackerRequest;
            bool lastTrackerRequest;
        };

        #endif