connection.h Example File
network/chat/connection.h
/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
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** accordance with the Qt Preview License Agreement provided with the
** Software.
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** information about Qt Commercial License Agreements.
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** not clear to you.
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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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