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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the documentation of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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/*!
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\page datastreamformat.html
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\title Format of the QDataStream Operators
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\brief Representations of data types that can be serialized by QDataStream.
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The \l QDataStream allows you to serialize some of the Qt data types.
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The table below lists the data types that QDataStream can serialize
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and how they are represented. The format described below is
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\l{QDataStream::setVersion()}{version 8}.
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It is always best to cast integers to a Qt integer type, such as
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qint16 or quint32, when reading and writing. This ensures that
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you always know exactly what size integers you are reading and
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writing, no matter what the underlying platform and architecture
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the application happens to be running on.
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\table
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\row \o bool
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\o \list
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\o boolean
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\endlist
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\row \o qint8
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\o \list
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\o signed byte
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\endlist
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\row \o qint16
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\o \list
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\o signed 16-bit integer
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\endlist
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\row \o qint32
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\o \list
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\o signed 32-bit integer
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\endlist
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\row \o qint64
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\o \list
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\o signed 64-bit integer
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\endlist
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\row \o quint8
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\o \list
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\o unsigned byte
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\endlist
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\row \o quint16
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\o \list
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\o unsigned 16-bit integer
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\endlist
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\row \o quint32
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\o \list
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\o unsigned 32-bit integer
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\endlist
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\row \o quint64
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\o \list
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\o unsigned 64-bit integer
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\endlist
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\row \o \c float
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\o \list
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\o 32-bit floating point number using the standard IEEE 754 format
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\endlist
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\row \o \c double
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\o \list
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\o 64-bit floating point number using the standard IEEE 754 format
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\endlist
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\row \o \c {const char *}
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\o \list
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\o The string length (quint32)
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\o The string bytes, excluding the terminating 0
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\endlist
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\row \o QBitArray
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\o \list
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\o The array size (quint32)
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\o The array bits, i.e. (size + 7)/8 bytes
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\endlist
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\row \o QBrush
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\o \list
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\o The brush style (quint8)
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\o The brush color (QColor)
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\o If style is CustomPattern, the brush pixmap (QPixmap)
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\endlist
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\row \o QByteArray
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\o \list
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\o If the byte array is null: 0xFFFFFFFF (quint32)
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\o Otherwise: the array size (quint32) followed by the array bytes, i.e. size bytes
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\endlist
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\row \o \l QColor
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\o \list
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\o Color spec (qint8)
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\o Alpha value (quint16)
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\o Red value (quint16)
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\o Green value (quint16)
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\o Blue value (quint16)
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\o Pad value (quint16)
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\endlist
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\row \o QCursor
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\o \list
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\o Shape ID (qint16)
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\o If shape is BitmapCursor: The bitmap (QPixmap), mask (QPixmap), and hot spot (QPoint)
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\endlist
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\row \o QDate
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\o \list
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\o Julian day (quint32)
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\endlist
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\row \o QDateTime
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\o \list
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\o Date (QDate)
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\o Time (QTime)
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\o 0 for Qt::LocalTime, 1 for Qt::UTC (quint8)
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\endlist
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\row \o QFont
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\o \list
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\o The family (QString)
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\o The point size (qint16)
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\o The style hint (quint8)
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\o The char set (quint8)
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\o The weight (quint8)
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\o The font bits (quint8)
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\endlist
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\row \o QHash<Key, T>
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\o \list
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\o The number of items (quint32)
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\o For all items, the key (Key) and value (T)
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\endlist
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\row \o QIcon
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\o \list
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\o The number of pixmap entries (quint32)
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\o For all pixmap entries:
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\list
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\o The pixmap (QPixmap)
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\o The file name (QString)
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\o The pixmap size (QSize)
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\o The \l{QIcon::Mode}{mode} (quint32)
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\o The \l{QIcon::State}{state} (quint32)
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\endlist
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\endlist
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\row \o QImage
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\o \list
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\o If the image is null a "null image" marker is saved;
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otherwise the image is saved in PNG or BMP format (depending
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on the stream version). If you want control of the format,
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stream the image into a QBuffer (using QImageIO) and stream
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that.
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\endlist
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\row \o QKeySequence
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\o \list
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\o A QList<int>, where each integer is a key in the key sequence
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\endlist
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\row \o QLinkedList<T>
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\o \list
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\o The number of items (quint32)
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\o The items (T)
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\endlist
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\row \o QList<T>
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\o \list
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\o The number of items (quint32)
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\o The items (T)
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\endlist
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\row \o QMap<Key, T>
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\o \list
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\o The number of items (quint32)
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\o For all items, the key (Key) and value (T)
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\endlist
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\row \o QMatrix
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\o \list
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\o m11 (double)
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\o m12 (double)
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\o m21 (double)
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\o m22 (double)
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\o dx (double)
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\o dy (double)
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\endlist
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\row \o QMatrix4x4
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\o \list
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\o m11 (double)
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\o m12 (double)
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\o m13 (double)
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\o m14 (double)
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\o m21 (double)
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\o m22 (double)
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\o m23 (double)
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\o m24 (double)
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\o m31 (double)
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\o m32 (double)
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\o m33 (double)
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\o m34 (double)
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\o m41 (double)
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\o m42 (double)
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\o m43 (double)
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\o m44 (double)
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\endlist
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\row \o QPair<T1, T2>
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\o \list
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\o first (T1)
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\o second (T2)
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\endlist
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\row \o QPalette
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\o The disabled, active, and inactive color groups, each of which consists
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of the following:
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\list
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\o foreground (QBrush)
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\o button (QBrush)
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\o light (QBrush)
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\o midlight (QBrush)
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\o dark (QBrush)
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\o mid (QBrush)
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\o text (QBrush)
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\o brightText (QBrush)
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\o buttonText (QBrush)
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\o base (QBrush)
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\o background (QBrush)
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\o shadow (QBrush)
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\o highlight (QBrush)
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\o highlightedText (QBrush)
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\o link (QBrush)
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\o linkVisited (QBrush)
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\endlist
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\row \o QPen
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\o \list
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\o The pen styles (quint8)
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\o The pen width (quint16)
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\o The pen color (QColor)
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\endlist
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\row \o QPicture
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\o \list
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\o The size of the picture data (quint32)
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\o The raw bytes of picture data (char)
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\endlist
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\row \o QPixmap
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\o \list
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\o Save it as a PNG image.
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\endlist
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\row \o QPoint
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\o \list
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\o The x coordinate (qint32)
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\o The y coordinate (qint32)
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\endlist
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\row \o QQuaternion
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\o \list
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\o The scalar component (double)
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\o The x coordinate (double)
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\o The y coordinate (double)
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\o The z coordinate (double)
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\endlist
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\row \o QRect
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\o \list
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\o left (qint32)
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\o top (qint32)
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\o right (qint32)
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\o bottom (qint32)
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\endlist
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\row \o QRegExp
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\o \list
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\o The regexp pattern (QString)
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\o Case sensitivity (quint8)
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\o Regular expression syntax (quint8)
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\o Minimal matching (quint8)
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\endlist
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\row \o QRegion
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\o \list
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\o The size of the data, i.e. 8 + 16 * (number of rectangles) (quint32)
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\o 10 (qint32)
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\o The number of rectangles (quint32)
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\o The rectangles in sequential order (QRect)
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\endlist
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\row \o QSize
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\o \list
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\o width (qint32)
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\o height (qint32)
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\endlist
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\row \o QString
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\o \list
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\o If the string is null: 0xFFFFFFFF (quint32)
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\o Otherwise: The string length in bytes (quint32) followed by the data in UTF-16
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\endlist
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\row \o QTime
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\o \list
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\o Milliseconds since midnight (quint32)
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\endlist
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\row \o QTransform
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\o \list
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\o m11 (double)
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\o m12 (double)
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\o m13 (double)
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\o m21 (double)
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\o m22 (double)
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\o m23 (double)
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\o m31 (double)
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\o m32 (double)
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\o m33 (double)
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\endlist
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\row \o QUrl
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\o \list
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\o Holds an URL (QString)
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\endlist
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\row \o QVariant
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\o \list
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\o The type of the data (quint32)
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\o The null flag (qint8)
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\o The data of the specified type
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\endlist
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\row \o QVector2D
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\o \list
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\o the x coordinate (double)
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\o the y coordinate (double)
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\endlist
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\row \o QVector3D
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\o \list
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\o the x coordinate (double)
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\o the y coordinate (double)
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\o the z coordinate (double)
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\endlist
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350 |
\row \o QVector4D
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351 |
\o \list
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352 |
\o the x coordinate (double)
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353 |
\o the y coordinate (double)
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354 |
\o the z coordinate (double)
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355 |
\o the w coordinate (double)
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356 |
\endlist
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357 |
\row \o QVector<T>
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358 |
\o \list
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359 |
\o The number of items (quint32)
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360 |
\o The items (T)
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361 |
\endlist
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362 |
\endtable
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363 |
*/
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