/****************************************************************************
** $Id: qasyncio.h,v 1.5.2.1 1998/08/19 16:02:28 agulbra Exp $
**
** *** INTERNAL HEADER FILE ***
**
** This file is NOT a part of the Qt interface!
**
** Definition of asynchronous I/O classes
**
** Created : 970617
**
** Copyright (C) 1992-1999 Troll Tech AS. All rights reserved.
**
** This file is part of Qt Free Edition, version 1.45.
**
** See the file LICENSE included in the distribution for the usage
** and distribution terms, or http://www.troll.no/free-license.html.
**
** IMPORTANT NOTE: You may NOT copy this file or any part of it into
** your own programs or libraries.
**
** Please see http://www.troll.no/pricing.html for information about
** Qt Professional Edition, which is this same library but with a
** license which allows creation of commercial/proprietary software.
**
*****************************************************************************/
#ifndef QASYNCIO_H
#define QASYNCIO_H
#ifndef QT_H
#include "qobject.h"
#include "qsignal.h"
#include "qtimer.h"
#endif // QT_H
class QIODevice;
class Q_EXPORT QAsyncIO {
public:
virtual ~QAsyncIO();
void connect(QObject*, const char* member);
protected:
void ready();
private:
QSignal signal;
};
class Q_EXPORT QDataSink : public QAsyncIO {
public:
// Call this to know how much I can take.
virtual int readyToReceive()=0;
virtual void receive(const uchar*, int count)=0;
virtual void eof()=0;
void maybeReady();
};
class Q_EXPORT QDataSource : public QAsyncIO {
public:
virtual int readyToSend()=0; // returns -1 when never any more ready
virtual void sendTo(QDataSink*, int count)=0;
void maybeReady();
virtual bool rewindable() const;
virtual void enableRewind(bool);
virtual void rewind();
};
class Q_EXPORT QIODeviceSource : public QDataSource {
const int buf_size;
uchar *buffer;
QIODevice* iod;
bool rew;
public:
QIODeviceSource(QIODevice*, int bufsize=4096);
~QIODeviceSource();
int readyToSend();
void sendTo(QDataSink* sink, int n);
bool rewindable() const;
void enableRewind(bool on);
void rewind();
};
class Q_EXPORT QDataPump : public QObject {
Q_OBJECT
int interval;
QTimer timer;
QDataSource* source;
QDataSink* sink;
public:
QDataPump(QDataSource*, QDataSink*);
private slots:
void kickStart();
void tryToPump();
};
#endif
| Copyright © 1999 Troll Tech | Trademarks | Qt version 1.45
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