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39
40#ifndef QIODEVICE_H
41#define QIODEVICE_H
42
43#include <QtCore/qglobal.h>
44#ifndef QT_NO_QOBJECT
45#include <QtCore/qobject.h>
46#else
47#include <QtCore/qobjectdefs.h>
48#include <QtCore/qscopedpointer.h>
49#endif
50#include <QtCore/qstring.h>
51
52#ifdef open
53#error qiodevice.h must be included before any header file that defines open
54#endif
55
56QT_BEGIN_NAMESPACE
57
58
59class QByteArray;
60class QIODevicePrivate;
61
62class Q_CORE_EXPORT QIODevice
63#ifndef QT_NO_QOBJECT
64 : public QObject
65#endif
66{
67#ifndef QT_NO_QOBJECT
68 Q_OBJECT
69#endif
70public:
71 enum OpenModeFlag {
72 NotOpen = 0x0000,
73 ReadOnly = 0x0001,
74 WriteOnly = 0x0002,
75 ReadWrite = ReadOnly | WriteOnly,
76 Append = 0x0004,
77 Truncate = 0x0008,
78 Text = 0x0010,
79 Unbuffered = 0x0020,
80 NewOnly = 0x0040,
81 ExistingOnly = 0x0080
82 };
83 Q_DECLARE_FLAGS(OpenMode, OpenModeFlag)
84
85 QIODevice();
86#ifndef QT_NO_QOBJECT
87 explicit QIODevice(QObject *parent);
88#endif
89 virtual ~QIODevice();
90
91 OpenMode openMode() const;
92
93 void setTextModeEnabled(bool enabled);
94 bool isTextModeEnabled() const;
95
96 bool isOpen() const;
97 bool isReadable() const;
98 bool isWritable() const;
99 virtual bool isSequential() const;
100
101 int readChannelCount() const;
102 int writeChannelCount() const;
103 int currentReadChannel() const;
104 void setCurrentReadChannel(int channel);
105 int currentWriteChannel() const;
106 void setCurrentWriteChannel(int channel);
107
108 virtual bool open(OpenMode mode);
109 virtual void close();
110
111 // ### Qt 6: pos() and seek() should not be virtual, and
112 // ### seek() should call a virtual seekData() function.
113 virtual qint64 pos() const;
114 virtual qint64 size() const;
115 virtual bool seek(qint64 pos);
116 virtual bool atEnd() const;
117 virtual bool reset();
118
119 virtual qint64 bytesAvailable() const;
120 virtual qint64 bytesToWrite() const;
121
122 qint64 read(char *data, qint64 maxlen);
123 QByteArray read(qint64 maxlen);
124 QByteArray readAll();
125 qint64 readLine(char *data, qint64 maxlen);
126 QByteArray readLine(qint64 maxlen = 0);
127 virtual bool canReadLine() const;
128
129 void startTransaction();
130 void commitTransaction();
131 void rollbackTransaction();
132 bool isTransactionStarted() const;
133
134 qint64 write(const char *data, qint64 len);
135 qint64 write(const char *data);
136 inline qint64 write(const QByteArray &data)
137 { return write(data: data.constData(), len: data.size()); }
138
139 qint64 peek(char *data, qint64 maxlen);
140 QByteArray peek(qint64 maxlen);
141 qint64 skip(qint64 maxSize);
142
143 virtual bool waitForReadyRead(int msecs);
144 virtual bool waitForBytesWritten(int msecs);
145
146 void ungetChar(char c);
147 bool putChar(char c);
148 bool getChar(char *c);
149
150 QString errorString() const;
151
152#ifndef QT_NO_QOBJECT
153Q_SIGNALS:
154 void readyRead();
155 void channelReadyRead(int channel);
156 void bytesWritten(qint64 bytes);
157 void channelBytesWritten(int channel, qint64 bytes);
158 void aboutToClose();
159 void readChannelFinished();
160#endif
161
162protected:
163#ifdef QT_NO_QOBJECT
164 QIODevice(QIODevicePrivate &dd);
165#else
166 QIODevice(QIODevicePrivate &dd, QObject *parent = nullptr);
167#endif
168 virtual qint64 readData(char *data, qint64 maxlen) = 0;
169 virtual qint64 readLineData(char *data, qint64 maxlen);
170 virtual qint64 writeData(const char *data, qint64 len) = 0;
171
172 void setOpenMode(OpenMode openMode);
173
174 void setErrorString(const QString &errorString);
175
176#ifdef QT_NO_QOBJECT
177 QScopedPointer<QIODevicePrivate> d_ptr;
178#endif
179
180private:
181 Q_DECLARE_PRIVATE(QIODevice)
182 Q_DISABLE_COPY(QIODevice)
183};
184
185Q_DECLARE_OPERATORS_FOR_FLAGS(QIODevice::OpenMode)
186
187#if !defined(QT_NO_DEBUG_STREAM)
188class QDebug;
189Q_CORE_EXPORT QDebug operator<<(QDebug debug, QIODevice::OpenMode modes);
190#endif
191
192QT_END_NAMESPACE
193
194#endif // QIODEVICE_H
195

source code of qtbase/src/corelib/io/qiodevice.h