Home · All Namespaces · All Classes · Main Classes · Grouped Classes · Modules · Functions

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

 /****************************************************************************
 **
 ** Copyright (C) 1992-2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
 **
 ** This file is part of the documentation of the Qt Toolkit.
 **
 ** Licensees holding a valid Qt License Agreement may use this file in
 ** accordance with the rights, responsibilities and obligations
 ** contained therein.  Please consult your licensing agreement or
 ** contact [email protected] if any conditions of this licensing
 ** agreement are not clear to you.
 **
 ** Further information about Qt licensing is available at:
 ** http://trolltech.com/products/appdev/licensing.
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ****************************************************************************/

 #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