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Format of the QDataStream Operators

The 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.

• Q_INT8
  • signed byte
• Q_INT16
  • signed 16 bit integer
• Q_INT32
  • signed 32 bit integer
• Q_UINT8
  • unsigned byte
• Q_UINT16
  • unsigned 16 bit integer
• Q_UINT32
  • unsigned 32 bit integer
• float
  • 32-bit floating point number using the standard IEEE-754 format
• double
  • 64-bit floating point number using the standard IEEE-754 format
• char *
  • The size of the string including the terminating 0 (Q_UINT32)
  • The string bytes including the terminating 0
  The null string is represented as (Q_UINT32) 0.
• QBitArray
  • The array size (Q_UINT32)
  • The array bits, i.e. (size + 7)/8 bytes
• QBrush
  • The brush style (Q_UINT8)
  • The brush color (QColor)
  • If style is CustomPattern, the brush pixmap (QPixmap)
• QByteArray
  • The array size (Q_UINT32)
  • The array bytes, i.e. size bytes
• QCString
  • The size of the string including the terminating 0 (Q_UINT32)
  • The string bytes including the terminating 0
  The null string is represented as (Q_UINT32) 0.
• QColor
  • RGB value serialized as a Q_UINT32
• QColorGroup
  • foreground (QBrush)
  • button (QBrush)
  • light (QBrush)
  • midLight (QBrush)
  • dark (QBrush)
  • mid (QBrush)
  • text (QBrush)
  • brightText (QBrush)
  • ButtonText (QBrush)
  • base (QBrush)
  • background (QBrush)
  • shadow (QBrush)
  • highlight (QBrush)
  • highlightedText (QBrush)
• QCursor
  • Shape id (Q_INT16)
  • If shape is BitmapCursor: The bitmap (QPixmap), mask (QPixmap) and hot spot (QPoint)
• QDate
  • Julian day (Q_UINT32)
• QDateTime
  • Date (QDate)
  • Time (QTime)
• QFont
  • The point size (Q_INT16)
  • The style hint (Q_UINT8)
  • The char set (Q_UINT8)
  • The weight (Q_UINT8)
  • The font bits (Q_UINT8)
• QImage
  • Save it as a PNG image.
• QMap
  • The number of items (Q_UINT32)
  • For all items, the key and value
• QPalette
  • active (QColorGroup)
  • disabled (QColorGroup)
  • inactive (QColorGroup)
• QPen
  • The pen styles (Q_UINT8)
  • The pen width (Q_UINT8)
  • The pen color (QColor)
• QPicture
  • The size of the picture data (Q_UINT32)
  • The raw bytes of picture data (char)
• QPixmap
  • Save it as a PNG image.
• QPoint
  • The x coordinate (Q_INT32)
  • The y coordinate (Q_INT32)
• QPointArray
  • The array size (Q_UINT32)
  • The array points (QPoint)
• QRect
  • left (Q_INT32)
  • top (Q_INT32)
  • right (Q_INT32)
  • bottom (Q_INT32)
• QRegion
  • The size of the data, i.e. 8 + 16 * (number of rectangles) (Q_UINT32)
  • QRGN_RECTS (Q_INT32)
  • The number of rectangles (Q_UINT32)
  • The rectangles in sequential order (QRect)
• QSize
  • width (Q_INT32)
  • height (Q_INT32)
• QString
  • If the string is null: 0xffffffff (Q_UINT32)
  • Otherwise: The string length (Q_UINT32) followed by the data in UTF-16
• QTime
  • Milliseconds since midnight (Q_UINT32)
• QValueList
  • The number of list elements (Q_UINT32)
  • All the elements in sequential order
• QVariant
  • The type of the data (Q_UINT32)
  • The data of the specified type
• QWMatrix
  • m11 (double)
  • m12 (double)
  • m21 (double)
  • m22 (double)
  • dx (double)
  • dy (double)