doc/html/datastreamformat.html


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<title>Format of the QDataStream Operators</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Format of the QDataStream Operators</h1>


<p> The <a href="qdatastream.html">QDataStream</a> allows you to serialize some of the Qt data types.
The table below lists the data types that <a href="qdatastream.html">QDataStream</a> can serialize
and how they are represented.
<p> It is best to always cast integers to a Qt integer type when writing,
and to read back into the same Qt integer type when reading.
<p> <center><table cellpadding="4" cellspacing="2" border="0">
<tr bgcolor="#f0f0f0"> <td valign="top">Q_INT8
<td valign="top"><ul>
<li> signed byte
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">Q_INT16
<td valign="top"><ul>
<li> signed 16 bit integer
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">Q_INT32
<td valign="top"><ul>
<li> signed 32 bit integer
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">Q_UINT8
<td valign="top"><ul>
<li> unsigned byte
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">Q_UINT16
<td valign="top"><ul>
<li> unsigned 16 bit integer
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">Q_UINT32
<td valign="top"><ul>
<li> unsigned 32 bit integer
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">float
<td valign="top"><ul>
<li> 32-bit floating point number using the standard IEEE-754 format
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">double
<td valign="top"><ul>
<li> 64-bit floating point number using the standard IEEE-754 format
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">char *
<td valign="top"><ul>
<li> The size of the string including the terminating 0 (Q_UINT32)
<li> The string bytes including the terminating 0
</ul>
The null string is represented as <tt>(Q_UINT32) 0</tt>.
<tr bgcolor="#d0d0d0"> <td valign="top">QBitArray
<td valign="top"><ul>
<li> The array size (Q_UINT32)
<li> The array bits, i.e. (size + 7)/8 bytes
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">QBrush
<td valign="top"><ul>
<li> The brush style (Q_UINT8)
<li> The brush color (<a href="qcolor.html">QColor</a>)
<li> If style is CustomPattern, the brush pixmap (<a href="qpixmap.html">QPixmap</a>)
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">QByteArray
<td valign="top"><ul>
<li> The array size (Q_UINT32)
<li> The array bytes, i.e. size bytes
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">QCString
<td valign="top"><ul>
<li> The size of the string including the terminating 0 (Q_UINT32)
<li> The string bytes including the terminating 0
</ul>
The null string is represented as <tt>(Q_UINT32) 0</tt>.
<tr bgcolor="#d0d0d0"> <td valign="top"><a href="qcolor.html">QColor</a>
<td valign="top"><ul><li> RGB value serialized as a Q_UINT32 </ul>
<tr bgcolor="#f0f0f0"> <td valign="top">QColorGroup
<td valign="top"><ul>
<li> foreground (<a href="qbrush.html">QBrush</a>)
<li> button (QBrush)
<li> light (QBrush)
<li> midLight (QBrush)
<li> dark (QBrush)
<li> mid (QBrush)
<li> text (QBrush)
<li> brightText (QBrush)
<li> ButtonText (QBrush)
<li> base (QBrush)
<li> background (QBrush)
<li> shadow (QBrush)
<li> highlight (QBrush)
<li> highlightedText (QBrush)
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">QCursor
<td valign="top"><ul>
<li> Shape id (Q_INT16)
<li> If shape is BitmapCursor: The bitmap (<a href="qpixmap.html">QPixmap</a>), mask (QPixmap) and hot spot (<a href="qpoint.html">QPoint</a>)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">QDate
<td valign="top"><ul>
<li> Julian day (Q_UINT32)
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">QDateTime
<td valign="top"><ul>
<li> Date (<a href="qdate.html">QDate</a>)
<li> Time (<a href="qtime.html">QTime</a>)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">QFont
<td valign="top"><ul>
<li> The family (<a href="qcstring.html">QCString</a>)
<li> The point size (Q_INT16)
<li> The style hint (Q_UINT8)
<li> The char set (Q_UINT8)
<li> The weight (Q_UINT8)
<li> The font bits (Q_UINT8)
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">QImage
<td valign="top"><ul>
<li> 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 <a href="qbuffer.html">QBuffer</a> (using <a href="qimageio.html">QImageIO</a>) and stream
that.
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">QMap
<td valign="top"><ul>
<li> The number of items (Q_UINT32)
<li> For all items, the key and value
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">QPalette
<td valign="top"><ul>
<li> active (<a href="qcolorgroup.html">QColorGroup</a>)
<li> disabled (QColorGroup)
<li> inactive (QColorGroup)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">QPen
<td valign="top"><ul>
<li> The pen styles (Q_UINT8)
<li> The pen width (Q_UINT8)
<li> The pen color (<a href="qcolor.html">QColor</a>)
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">QPicture
<td valign="top"><ul>
<li> The size of the picture data (Q_UINT32)
<li> The raw bytes of picture data (char)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">QPixmap
<td valign="top"><ul>
<li> Save it as a PNG image.
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">QPoint
<td valign="top"><ul>
<li> The x coordinate (Q_INT32)
<li> The y coordinate (Q_INT32)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">QPointArray
<td valign="top"><ul>
<li> The array size (Q_UINT32)
<li> The array points (<a href="qpoint.html">QPoint</a>)
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">QRect
<td valign="top"><ul>
<li> left (Q_INT32)
<li> top (Q_INT32)
<li> right (Q_INT32)
<li> bottom (Q_INT32)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">QRegion
<td valign="top"><ul>
<li> The size of the data, i.e. 8 + 16 * (number of rectangles) (Q_UINT32)
<li> QRGN_RECTS (Q_INT32)
<li> The number of rectangles (Q_UINT32)
<li> The rectangles in sequential order (<a href="qrect.html">QRect</a>)
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">QSize
<td valign="top"><ul>
<li> width (Q_INT32)
<li> height (Q_INT32)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">QString
<td valign="top"><ul>
<li> If the string is null: 0xffffffff (Q_UINT32)<br>
otherwise: The string length (Q_UINT32) followed by the
data in UTF-16
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">QTime
<td valign="top"><ul>
<li> Milliseconds since midnight (Q_UINT32)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">QValueList
<td valign="top"><ul>
<li> The number of list elements (Q_UINT32)
<li> All the elements in sequential order
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">QVariant
<td valign="top"><ul>
<li> The type of the data (Q_UINT32)
<li> The data of the specified type
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">QWMatrix
<td valign="top"><ul>
<li> m11 (double)
<li> m12 (double)
<li> m21 (double)
<li> m22 (double)
<li> dx (double)
<li> dy (double)
</ul>
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