doc: Remove incomplete information for QDataStream
This document is bound to run out of sync with reality. Actually there are changes from Qt4.x missing. The streaming operators of the classes contain many if-then-else cases, making it difficult to represented in a plain text. With only a partial definition of the protocol, this document is useless to users, because they should not care how the actual protocol is implemented. Fixes: QTBUG-73386 Change-Id: I7fc4066ef8186d54dfd48445452c1a6d8bf371c3 Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io> Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>bb10
Rainer Keller
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@ -28,357 +28,71 @@
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/*!
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\page datastreamformat.html
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\title Serializing Qt Data Types
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\brief Representations of data types that can be serialized by QDataStream.
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\brief List 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 13}.
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The \l QDataStream class allows you to serialize the Qt data types
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listed in this section as of \l{QDataStream::setVersion()}{version 18}.
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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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\l{qint16} or \l{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 \li bool
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\li \list
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\li boolean
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\endlist
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\row \li qint8
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\li \list
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\li signed byte
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\endlist
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\row \li qint16
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\li \list
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\li signed 16-bit integer
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\endlist
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\row \li qint32
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\li \list
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\li signed 32-bit integer
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\endlist
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\row \li qint64
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\li \list
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\li signed 64-bit integer
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\endlist
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\row \li quint8
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\li \list
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\li unsigned byte
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\endlist
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\row \li quint16
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\li \list
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\li unsigned 16-bit integer
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\endlist
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\row \li quint32
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\li \list
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\li unsigned 32-bit integer
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\endlist
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\row \li quint64
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\li \list
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\li unsigned 64-bit integer
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\endlist
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\row \li \c float
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\li \list
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\li 32-bit floating point number using the standard IEEE 754 format
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\endlist
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\row \li \c double
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\li \list
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\li 64-bit floating point number using the standard IEEE 754 format
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\endlist
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\row \li \c {const char *}
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\li \list
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\li The string length (quint32)
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\li The string bytes, excluding the terminating 0
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\endlist
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\row \li QBitArray
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\li \list
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\li The array size (quint32)
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\li The array bits, i.e. (size + 7)/8 bytes
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\endlist
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\row \li QBrush
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\li \list
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\li The brush style (quint8)
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\li The brush color (QColor)
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\li If style is CustomPattern, the brush pixmap (QPixmap)
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\endlist
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\row \li QByteArray
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\li \list
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\li If the byte array is null: 0xFFFFFFFF (quint32)
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\li Otherwise: the array size (quint32) followed by the array bytes, i.e. size bytes
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\endlist
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\row \li \l QColor
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\li \list
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\li Color spec (qint8)
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\li Alpha value (quint16)
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\li Red value (quint16)
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\li Green value (quint16)
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\li Blue value (quint16)
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\li Pad value (quint16)
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\endlist
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\row \li QCursor
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\li \list
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\li Shape ID (qint16)
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\li If shape is BitmapCursor: The bitmap (QPixmap), mask (QPixmap), and hot spot (QPoint)
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\endlist
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\row \li QDate
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\li \list
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\li Julian day (quint32)
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\endlist
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\row \li QDateTime
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\li \list
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\li Date (QDate)
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\li Time (QTime)
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\li The \l{Qt::TimeSpec}{time spec}
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offsetFromUtc (qint32) if Qt::TimeSpec is offsetFromUtc
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TimeZone(QTimeZone) if Qt::TimeSpec is TimeZone
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\endlist
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\row \li QEasingCurve
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\li \list
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\li type (quint8)
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\li func (quint64)
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\li hasConfig (bool)
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\li If hasConfig is true then these fields follow:
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\li list
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\li period (double)
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\li amplitude (double)
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\li overshoot (double)
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\endlist
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\row \li QFont
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\li \list
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\li The family (QString)
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\li The style name (QString)
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\li The point size (double)
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\li The pixel size (qint32)
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\li The style hint (quint8)
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\li The style strategy (quint16)
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\li The char set (quint8)
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\li The weight (quint8)
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\li The font bits (quint8)
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\li The font stretch (quint16)
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\li The extended font bits (quint8)
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\li The letter spacing (double)
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\li The word spacing (double)
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\li The hinting preference (quint8)
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\endlist
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\row \li QHash<Key, T>
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\li \list
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\li The number of items (quint32)
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\li For all items, the key (Key) and value (T)
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\endlist
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\row \li QIcon
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\li \list
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\li The number of pixmap entries (quint32)
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\li For all pixmap entries:
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\list
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\li The pixmap (QPixmap)
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\li The file name (QString)
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\li The pixmap size (QSize)
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\li The \l{QIcon::Mode}{mode} (quint32)
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\li The \l{QIcon::State}{state} (quint32)
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\endlist
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\endlist
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\row \li QImage
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\li \list
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\li 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 QImageIOHandler/QImageIOPlugin) and stream
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that.
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\endlist
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\row \li QKeySequence
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\li \list
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\li A QList<int>, where each integer is a key in the key sequence
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\endlist
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\row \li QLinkedList<T>
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\li \list
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\li The number of items (quint32)
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\li The items (T)
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\endlist
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\row \li QList<T>
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\li \list
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\li The number of items (quint32)
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\li The items (T)
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\endlist
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\row \li QMap<Key, T>
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\li \list
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\li The number of items (quint32)
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\li For all items, the key (Key) and value (T)
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\endlist
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\row \li QMargins
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\li \list
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\li left (int)
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\li top (int)
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\li right (int)
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\li bottom (int)
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\endlist
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\row \li QMatrix
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\li \list
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\li m11 (double)
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\li m12 (double)
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\li m21 (double)
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\li m22 (double)
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\li dx (double)
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\li dy (double)
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\endlist
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\row \li QMatrix4x4
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\li \list
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\li m11 (float)
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\li m12 (float)
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\li m13 (float)
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\li m14 (float)
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\li m21 (float)
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\li m22 (float)
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\li m23 (float)
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\li m24 (float)
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\li m31 (float)
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\li m32 (float)
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\li m33 (float)
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\li m34 (float)
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\li m41 (float)
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\li m42 (float)
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\li m43 (float)
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\li m44 (float)
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\endlist
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\row \li QPair<T1, T2>
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\li \list
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\li first (T1)
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\li second (T2)
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\endlist
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\row \li QPalette
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\li 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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\li foreground (QBrush)
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\li button (QBrush)
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\li light (QBrush)
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\li midlight (QBrush)
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\li dark (QBrush)
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\li mid (QBrush)
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\li text (QBrush)
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\li brightText (QBrush)
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\li buttonText (QBrush)
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\li base (QBrush)
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\li background (QBrush)
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\li shadow (QBrush)
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\li highlight (QBrush)
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\li highlightedText (QBrush)
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\li link (QBrush)
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\li linkVisited (QBrush)
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\endlist
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\row \li QPen
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\li \list
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\li The pen styles (quint8)
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\li The pen width (quint16)
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\li The pen color (QColor)
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\endlist
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\row \li QPicture
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\li \list
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\li The size of the picture data (quint32)
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\li The raw bytes of picture data (char)
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\endlist
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\row \li QPixmap
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\li \list
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\li Save it as a PNG image.
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\endlist
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\row \li QPoint
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\li \list
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\li The x coordinate (qint32)
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\li The y coordinate (qint32)
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\endlist
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\row \li QQuaternion
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\li \list
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\li The scalar component (float)
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\li The x coordinate (float)
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\li The y coordinate (float)
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\li The z coordinate (float)
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\endlist
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\row \li QRect
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\li \list
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\li left (qint32)
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\li top (qint32)
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\li right (qint32)
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\li bottom (qint32)
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\endlist
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\row \li QRegExp
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\li \list
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\li The regexp pattern (QString)
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\li Case sensitivity (quint8)
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\li Regular expression syntax (quint8)
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\li Minimal matching (quint8)
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\endlist
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\row \li QRegularExpression
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\li \list
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\li The regular expression pattern (QString)
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\li The pattern options (quint32)
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\endlist
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\row \li QRegion
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\li \list
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\li The size of the data, i.e. 8 + 16 * (number of rectangles) (quint32)
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\li 10 (qint32)
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\li The number of rectangles (quint32)
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\li The rectangles in sequential order (QRect)
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\endlist
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\row \li QSize
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\li \list
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\li width (qint32)
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\li height (qint32)
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\endlist
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\row \li QString
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\li \list
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\li If the string is null: 0xFFFFFFFF (quint32)
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\li Otherwise: The string length in bytes (quint32) followed by the data in UTF-16
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\endlist
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\row \li QTime
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\li \list
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\li Milliseconds since midnight (quint32)
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\endlist
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\row \li QTransform
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\li \list
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\li m11 (double)
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\li m12 (double)
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\li m13 (double)
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\li m21 (double)
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\li m22 (double)
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\li m23 (double)
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\li m31 (double)
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\li m32 (double)
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\li m33 (double)
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\endlist
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\row \li QUrl
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\li \list
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\li Holds an URL (QString)
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\endlist
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\row \li QVariant
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\li \list
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\li The type of the data (quint32)
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\li The null flag (qint8)
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\li The data of the specified type
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\endlist
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\row \li QVector2D
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\li \list
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\li the x coordinate (float)
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\li the y coordinate (float)
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\endlist
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\row \li QVector3D
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\li \list
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\li the x coordinate (float)
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\li the y coordinate (float)
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\li the z coordinate (float)
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\endlist
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\row \li QVector4D
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\li \list
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\li the x coordinate (float)
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\li the y coordinate (float)
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\li the z coordinate (float)
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\li the w coordinate (float)
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\endlist
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\row \li QVector<T>
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\li \list
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\li The number of items (quint32)
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\li The items (T)
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\endlist
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\endtable
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\list
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\li bool
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\li \l{qint8}
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\li \l{qint16}
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\li \l{qint32}
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\li \l{qint64}
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\li \l{quint8}
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\li \l{quint16}
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\li \l{quint32}
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\li \l{quint64}
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\li \c float
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\li \c double
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\li \c {const char *}
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\li QBitArray
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\li QBrush
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\li QByteArray
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\li QColor
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\li QCursor
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\li QDate
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\li QDateTime
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\li QEasingCurve
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\li QFont
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\li QGenericMatrix
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\li QHash<Key, T>
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\li QIcon
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\li QImage
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\li QKeySequence
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\li QLinkedList<T>
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\li QList<T>
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\li QMap<Key, T>
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\li QMargins
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\li QMatrix4x4
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\li QPair<T1, T2>
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\li QPalette
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\li QPen
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\li QPicture
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\li QPixmap
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\li QPoint
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\li QQuaternion
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\li QRect
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\li QRegExp
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\li QRegularExpression
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\li QRegion
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\li QSize
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\li QString
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\li QTime
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\li QTransform
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\li QUrl
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\li QVariant
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\li QVector2D
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\li QVector3D
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\li QVector4D
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\li QVector<T>
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\endlist
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\sa {JSON Support in Qt}
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*/
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Reference in New Issue