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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page datastreamformat.html
\title Format of the QDataStream Operators
\brief Representations of data types that can be serialized by QDataStream.
The \l QDataStream allows you to serialize some of the Qt data types.
The table below lists the data types that QDataStream can serialize
and how they are represented. The format described below is
\l{QDataStream::setVersion()}{version 8}.
It is always best to cast integers to a Qt integer type, such as
qint16 or quint32, when reading and writing. This ensures that
you always know exactly what size integers you are reading and
writing, no matter what the underlying platform and architecture
the application happens to be running on.
\table
\row \o bool
\o \list
\o boolean
\endlist
\row \o qint8
\o \list
\o signed byte
\endlist
\row \o qint16
\o \list
\o signed 16-bit integer
\endlist
\row \o qint32
\o \list
\o signed 32-bit integer
\endlist
\row \o qint64
\o \list
\o signed 64-bit integer
\endlist
\row \o quint8
\o \list
\o unsigned byte
\endlist
\row \o quint16
\o \list
\o unsigned 16-bit integer
\endlist
\row \o quint32
\o \list
\o unsigned 32-bit integer
\endlist
\row \o quint64
\o \list
\o unsigned 64-bit integer
\endlist
\row \o \c float
\o \list
\o 32-bit floating point number using the standard IEEE 754 format
\endlist
\row \o \c double
\o \list
\o 64-bit floating point number using the standard IEEE 754 format
\endlist
\row \o \c {const char *}
\o \list
\o The string length (quint32)
\o The string bytes, excluding the terminating 0
\endlist
\row \o QBitArray
\o \list
\o The array size (quint32)
\o The array bits, i.e. (size + 7)/8 bytes
\endlist
\row \o QBrush
\o \list
\o The brush style (quint8)
\o The brush color (QColor)
\o If style is CustomPattern, the brush pixmap (QPixmap)
\endlist
\row \o QByteArray
\o \list
\o If the byte array is null: 0xFFFFFFFF (quint32)
\o Otherwise: the array size (quint32) followed by the array bytes, i.e. size bytes
\endlist
\row \o \l QColor
\o \list
\o Color spec (qint8)
\o Alpha value (quint16)
\o Red value (quint16)
\o Green value (quint16)
\o Blue value (quint16)
\o Pad value (quint16)
\endlist
\row \o QCursor
\o \list
\o Shape ID (qint16)
\o If shape is BitmapCursor: The bitmap (QPixmap), mask (QPixmap), and hot spot (QPoint)
\endlist
\row \o QDate
\o \list
\o Julian day (quint32)
\endlist
\row \o QDateTime
\o \list
\o Date (QDate)
\o Time (QTime)
\o 0 for Qt::LocalTime, 1 for Qt::UTC (quint8)
\endlist
\row \o QFont
\o \list
\o The family (QString)
\o The point size (qint16)
\o The style hint (quint8)
\o The char set (quint8)
\o The weight (quint8)
\o The font bits (quint8)
\endlist
\row \o QHash<Key, T>
\o \list
\o The number of items (quint32)
\o For all items, the key (Key) and value (T)
\endlist
\row \o QIcon
\o \list
\o The number of pixmap entries (quint32)
\o For all pixmap entries:
\list
\o The pixmap (QPixmap)
\o The file name (QString)
\o The pixmap size (QSize)
\o The \l{QIcon::Mode}{mode} (quint32)
\o The \l{QIcon::State}{state} (quint32)
\endlist
\endlist
\row \o QImage
\o \list
\o If the image is null a "null image" marker is saved;
otherwise the image is saved in PNG or BMP format (depending
on the stream version). If you want control of the format,
stream the image into a QBuffer (using QImageIO) and stream
that.
\endlist
\row \o QKeySequence
\o \list
\o A QList<int>, where each integer is a key in the key sequence
\endlist
\row \o QLinkedList<T>
\o \list
\o The number of items (quint32)
\o The items (T)
\endlist
\row \o QList<T>
\o \list
\o The number of items (quint32)
\o The items (T)
\endlist
\row \o QMap<Key, T>
\o \list
\o The number of items (quint32)
\o For all items, the key (Key) and value (T)
\endlist
\row \o QMatrix
\o \list
\o m11 (double)
\o m12 (double)
\o m21 (double)
\o m22 (double)
\o dx (double)
\o dy (double)
\endlist
\row \o QMatrix4x4
\o \list
\o m11 (double)
\o m12 (double)
\o m13 (double)
\o m14 (double)
\o m21 (double)
\o m22 (double)
\o m23 (double)
\o m24 (double)
\o m31 (double)
\o m32 (double)
\o m33 (double)
\o m34 (double)
\o m41 (double)
\o m42 (double)
\o m43 (double)
\o m44 (double)
\endlist
\row \o QPair<T1, T2>
\o \list
\o first (T1)
\o second (T2)
\endlist
\row \o QPalette
\o The disabled, active, and inactive color groups, each of which consists
of the following:
\list
\o foreground (QBrush)
\o button (QBrush)
\o light (QBrush)
\o midlight (QBrush)
\o dark (QBrush)
\o mid (QBrush)
\o text (QBrush)
\o brightText (QBrush)
\o buttonText (QBrush)
\o base (QBrush)
\o background (QBrush)
\o shadow (QBrush)
\o highlight (QBrush)
\o highlightedText (QBrush)
\o link (QBrush)
\o linkVisited (QBrush)
\endlist
\row \o QPen
\o \list
\o The pen styles (quint8)
\o The pen width (quint16)
\o The pen color (QColor)
\endlist
\row \o QPicture
\o \list
\o The size of the picture data (quint32)
\o The raw bytes of picture data (char)
\endlist
\row \o QPixmap
\o \list
\o Save it as a PNG image.
\endlist
\row \o QPoint
\o \list
\o The x coordinate (qint32)
\o The y coordinate (qint32)
\endlist
\row \o QQuaternion
\o \list
\o The scalar component (double)
\o The x coordinate (double)
\o The y coordinate (double)
\o The z coordinate (double)
\endlist
\row \o QRect
\o \list
\o left (qint32)
\o top (qint32)
\o right (qint32)
\o bottom (qint32)
\endlist
\row \o QRegExp
\o \list
\o The regexp pattern (QString)
\o Case sensitivity (quint8)
\o Regular expression syntax (quint8)
\o Minimal matching (quint8)
\endlist
\row \o QRegion
\o \list
\o The size of the data, i.e. 8 + 16 * (number of rectangles) (quint32)
\o 10 (qint32)
\o The number of rectangles (quint32)
\o The rectangles in sequential order (QRect)
\endlist
\row \o QSize
\o \list
\o width (qint32)
\o height (qint32)
\endlist
\row \o QString
\o \list
\o If the string is null: 0xFFFFFFFF (quint32)
\o Otherwise: The string length in bytes (quint32) followed by the data in UTF-16
\endlist
\row \o QTime
\o \list
\o Milliseconds since midnight (quint32)
\endlist
\row \o QTransform
\o \list
\o m11 (double)
\o m12 (double)
\o m13 (double)
\o m21 (double)
\o m22 (double)
\o m23 (double)
\o m31 (double)
\o m32 (double)
\o m33 (double)
\endlist
\row \o QUrl
\o \list
\o Holds an URL (QString)
\endlist
\row \o QVariant
\o \list
\o The type of the data (quint32)
\o The null flag (qint8)
\o The data of the specified type
\endlist
\row \o QVector2D
\o \list
\o the x coordinate (double)
\o the y coordinate (double)
\endlist
\row \o QVector3D
\o \list
\o the x coordinate (double)
\o the y coordinate (double)
\o the z coordinate (double)
\endlist
\row \o QVector4D
\o \list
\o the x coordinate (double)
\o the y coordinate (double)
\o the z coordinate (double)
\o the w coordinate (double)
\endlist
\row \o QVector<T>
\o \list
\o The number of items (quint32)
\o The items (T)
\endlist
\endtable
*/
|
