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authorQt by Nokia <qt-info@nokia.com>2011-04-27 12:05:43 +0200
committeraxis <qt-info@nokia.com>2011-04-27 12:05:43 +0200
commit38be0d13830efd2d98281c645c3a60afe05ffece (patch)
tree6ea73f3ec77f7d153333779883e8120f82820abe /doc/src/files-and-resources/datastreamformat.qdoc
Initial import from the monolithic Qt.
This is the beginning of revision history for this module. If you want to look at revision history older than this, please refer to the Qt Git wiki for how to use Git history grafting. At the time of writing, this wiki is located here: http://qt.gitorious.org/qt/pages/GitIntroductionWithQt If you have already performed the grafting and you don't see any history beyond this commit, try running "git log" with the "--follow" argument. Branched from the monolithic repo, Qt master branch, at commit 896db169ea224deb96c59ce8af800d019de63f12
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Free Documentation License
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of this
+** file.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+ \page datastreamformat.html
+ \title Serializing Qt Data Types
+ \ingroup qt-network
+ \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 12}.
+
+ 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 QEasingCurve
+ \o \list
+ \o type (quint8)
+ \o func (quint64)
+ \o hasConfig (bool)
+ \o If hasConfig is true then these fields follow:
+ \o list
+ \o period (double)
+ \o amplitude (double)
+ \o overshoot (double)
+ \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
+*/