Question

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)