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

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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