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Format of the QDataStream operators


The QDataStream allows you to serialize some of the Qt data types. In the following table you find for these data types the format of the serialization.

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 IEEE754 format
double
  • 64-bit floating point number using the standard IEEE754 format
char*
  1. The length of the string including the terminating 0 (Q_UINT32)
  2. The string including the terminating 0, i.e. length bytes
QBrush
  1. The brush style (Q_UINT8)
  2. The brush color (QColor)
  3. If style == CustomPattern: the brush pixmap (QPixmap)
QColor
  • RGB value serialized as a Q_UINT32
QCursor
  1. Shape id (Q_INT16)
  2. If shape == BitmapCursor: bitmap (QPixmap)
  3. If shape == BitmapCursor: mask (QPixmap)
  4. If shape == BitmapCursor: hot spot (QPoint)
QFont
  1. The point size (Q_INT16)
  2. The style hint (Q_UINT8)
  3. The char set (Q_UINT8)
  4. The weight (Q_UINT8)
  5. The font bits (Q_UINT8)
QImage
  • Save it as a PNG image.
QColorGroup
  1. foreground (QBrush)
  2. button (QBrush)
  3. light (QBrush)
  4. midLight (QBrush)
  5. dark (QBrush)
  6. mid (QBrush)
  7. text (QBrush)
  8. brightText (QBrush)
  9. ButtonText (QBrush)
  10. base (QBrush)
  11. background (QBrush)
  12. shadow (QBrush)
  13. highlight (QBrush)
  14. highlightedText (QBrush)
QPalette
  1. active (QColorGroup)
  2. disabled (QColorGroup)
  3. inactive (QColorGroup)
QPen
  1. The pen style(s) (Q_UINT8)
  2. The pen width (Q_UINT8)
  3. The pen color (QColor)
QPixmap
  • Save it as a PNG image.
QPoint
  1. The x coordinate (Q_INT32)
  2. The y coordinate (Q_INT32)
QPointArray
  1. The array size (Q_UINT32)
  2. The array points (QPoint)
QRect
  1. left (Q_INT32)
  2. top (Q_INT32)
  3. right (Q_INT32)
  4. bottom (Q_INT32)
QRegion
  1. The size of the data, i.e. 8+16*(number of rectangles) (Q_UINT32)
  2. QRGN_RECTS (Q_INT32)
  3. The number of rectangles (Q_UINT32)
  4. The rectangles in sequential order (QRect)
QSize
  1. width (Q_INT32)
  2. height (Q_INT32)
QVariant
  1. The type of the data (Q_UINT32)
  2. The data of the specified type
QWMatrix
  1. m11 (double)
  2. m12 (double)
  3. m21 (double)
  4. m22 (double)
  5. dx (double)
  6. dy (double)
QBitArray
  1. The array size (Q_UINT32)
  2. The array bits, i.e. (size+7)/8 bytes
QByteArray
  1. The array size (Q_UINT32)
  2. The array bytes, i.e. size bytes
QCString
  1. The length (Q_UINT32)
  2. The data, i.e. length bytes
QDate
  • Julian day (Q_UINT32)
QTime
  • Milliseconds since midnight (Q_UINT32)
QDateTime
  1. Date (QDate)
  2. Time (QTime)
QMap
  1. The number of items (Q_UINT32)
  2. For all items: the key and value
QString
  1. If isNull():
    1. 0xffffffff (Q_UINT32)
  2. Else:
    1. length (Q_UINT32)
    2. data in utf16
QValueList
  1. The number of list elements (Q_UINT32)
  2. All the elements in sequential order

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Qt version 2.2.1