connection.h

QT 开发环境里面一个很重要的文件

/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes 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
** General Public Licensing requirements will be met:
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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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