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# connection.h Example File
network/chat/connection.h

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     #ifndef CONNECTION_H
     #define CONNECTION_H

     #include <QHostAddress>
     #include <QString>
     #include <QTcpSocket>
     #include <QTime>
     #include <QTimer>

     static const int MaxBufferSize = 1024000;

     class Connection : public QTcpSocket
     {
         Q_OBJECT

     public:
         enum ConnectionState {
             WaitingForGreeting,
             ReadingGreeting,
             ReadyForUse
         };
         enum DataType {
             PlainText,
             Ping,
             Pong,
             Greeting,
             Undefined
         };

         Connection(QObject *parent = 0);

         QString name() const;
         void setGreetingMessage(const QString &message);
         bool sendMessage(const QString &message);

     signals:
         void readyForUse();
         void newMessage(const QString &from, const QString &message);

     protected:
         void timerEvent(QTimerEvent *timerEvent);

     private slots:
         void processReadyRead();
         void sendPing();
         void sendGreetingMessage();

     private:
         int readDataIntoBuffer(int maxSize = MaxBufferSize);
         int dataLengthForCurrentDataType();
         bool readProtocolHeader();
         bool hasEnoughData();
         void processData();

         QString greetingMessage;
         QString username;
         QTimer pingTimer;
         QTime pongTime;
         QByteArray buffer;
         ConnectionState state;
         DataType currentDataType;
         int numBytesForCurrentDataType;
         int transferTimerId;
         bool isGreetingMessageSent;
     };

     #endif