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32<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>qasyncio.h</h1>
33
34<p>This is the verbatim text of the qasyncio.h include file. It is provided only for illustration; the copyright remains with Trolltech.
35<hr>
36<pre>
37/****************************************************************************
38** $Id: qasyncio-h.html 2051 2007-02-21 10:04:20Z chehrlic $
39**
40** Definition of asynchronous I/O classes
41**
42** Created : 970617
43**
44** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
45**
46** This file is part of the kernel module of the Qt GUI Toolkit.
47**
48** This file may be distributed under the terms of the Q Public License
49** as defined by Trolltech ASA of Norway and appearing in the file
50** LICENSE.QPL included in the packaging of this file.
51**
52** This file may be distributed and/or modified under the terms of the
53** GNU General Public License version 2 as published by the Free Software
54** Foundation and appearing in the file LICENSE.GPL included in the
55** packaging of this file.
56**
57** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
58** licenses may use this file in accordance with the Qt Commercial License
59** Agreement provided with the Software.
60**
61** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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72**********************************************************************/
73
74#ifndef QASYNCIO_H
75#define QASYNCIO_H
76
77#ifndef QT_H
78#include "qobject.h"
79#include "qsignal.h"
80#include "qtimer.h"
81#endif // QT_H
82
83#ifndef QT_NO_ASYNC_IO
84
85class QIODevice;
86
87class Q_EXPORT QAsyncIO {
88public:
89 virtual ~QAsyncIO();
90 void connect(QObject*, const char *member);
91
92protected:
93 void ready();
94
95private:
96 QSignal signal;
97};
98
99class Q_EXPORT QDataSink : public QAsyncIO {
100public:
101 // Call this to know how much I can take.
102 virtual int readyToReceive()=0;
103 virtual void receive(const uchar*, int count)=0;
104 virtual void eof()=0;
105 void maybeReady();
106};
107
108class Q_EXPORT QDataSource : public QAsyncIO {
109public:
110 virtual int readyToSend()=0; // returns -1 when never any more ready
111 virtual void sendTo(QDataSink*, int count)=0;
112 void maybeReady();
113
114 virtual bool rewindable() const;
115 virtual void enableRewind(bool);
116 virtual void rewind();
117};
118
119class Q_EXPORT QIODeviceSource : public QDataSource {
120 const int buf_size;
121 uchar *buffer;
122 QIODevice* iod;
123 bool rew;
124
125public:
126 QIODeviceSource(QIODevice*, int bufsize=4096);
127 ~QIODeviceSource();
128
129 int readyToSend();
130 void sendTo(QDataSink* sink, int n);
131 bool rewindable() const;
132 void enableRewind(bool on);
133 void rewind();
134};
135
136class Q_EXPORT QDataPump : public QObject {
137 Q_OBJECT
138 int interval;
139 QTimer timer;
140 QDataSource* source;
141 QDataSink* sink;
142
143public:
144 QDataPump(QDataSource*, QDataSink*);
145
146private slots:
147 void kickStart();
148 void tryToPump();
149};
150
151#endif // QT_NO_ASYNC_IO
152
153#endif
154</pre>
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