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246 lines
8.0 KiB
246 lines
8.0 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/datastreamformat.doc:36 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Format of the QDataStream Operators</title>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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</td>
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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>
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<p> The <a href="qdatastream.html">QDataStream</a> allows you to serialize some of the Qt data types.
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The table below lists the data types that <a href="qdatastream.html">QDataStream</a> can serialize
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and how they are represented.
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<p> It is best to always cast integers to a Qt integer type when writing,
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and to read back into the same Qt integer type when reading.
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<p> <center><table cellpadding="4" cellspacing="2" border="0">
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<tr bgcolor="#f0f0f0"> <td valign="top">Q_INT8
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<td valign="top"><ul>
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<li> signed byte
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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">Q_INT16
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<td valign="top"><ul>
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<li> signed 16 bit integer
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">Q_INT32
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<td valign="top"><ul>
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<li> signed 32 bit integer
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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">Q_UINT8
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<td valign="top"><ul>
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<li> unsigned byte
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">Q_UINT16
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<td valign="top"><ul>
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<li> unsigned 16 bit integer
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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">Q_UINT32
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<td valign="top"><ul>
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<li> unsigned 32 bit integer
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">float
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<td valign="top"><ul>
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<li> 32-bit floating point number using the standard IEEE-754 format
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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">double
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<td valign="top"><ul>
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<li> 64-bit floating point number using the standard IEEE-754 format
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">char *
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<td valign="top"><ul>
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<li> The size of the string including the terminating 0 (Q_UINT32)
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<li> The string bytes including the terminating 0
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</ul>
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The null string is represented as <tt>(Q_UINT32) 0</tt>.
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<tr bgcolor="#d0d0d0"> <td valign="top">QBitArray
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<td valign="top"><ul>
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<li> The array size (Q_UINT32)
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<li> The array bits, i.e. (size + 7)/8 bytes
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">QBrush
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<td valign="top"><ul>
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<li> The brush style (Q_UINT8)
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<li> The brush color (<a href="qcolor.html">QColor</a>)
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<li> If style is CustomPattern, the brush pixmap (<a href="qpixmap.html">QPixmap</a>)
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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">QByteArray
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<td valign="top"><ul>
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<li> The array size (Q_UINT32)
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<li> The array bytes, i.e. size bytes
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">QCString
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<td valign="top"><ul>
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<li> The size of the string including the terminating 0 (Q_UINT32)
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<li> The string bytes including the terminating 0
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</ul>
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The null string is represented as <tt>(Q_UINT32) 0</tt>.
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<tr bgcolor="#d0d0d0"> <td valign="top"><a href="qcolor.html">QColor</a>
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<td valign="top"><ul><li> RGB value serialized as a Q_UINT32 </ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">QColorGroup
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<td valign="top"><ul>
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<li> foreground (<a href="qbrush.html">QBrush</a>)
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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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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">QCursor
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<td valign="top"><ul>
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<li> Shape id (Q_INT16)
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<li> If shape is BitmapCursor: The bitmap (<a href="qpixmap.html">QPixmap</a>), mask (QPixmap) and hot spot (<a href="qpoint.html">QPoint</a>)
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">QDate
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<td valign="top"><ul>
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<li> Julian day (Q_UINT32)
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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">QDateTime
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<td valign="top"><ul>
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<li> Date (<a href="qdate.html">QDate</a>)
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<li> Time (<a href="qtime.html">QTime</a>)
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">QFont
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<td valign="top"><ul>
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<li> The family (<a href="qcstring.html">QCString</a>)
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<li> The point size (Q_INT16)
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<li> The style hint (Q_UINT8)
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<li> The char set (Q_UINT8)
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<li> The weight (Q_UINT8)
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<li> The font bits (Q_UINT8)
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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">QImage
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<td valign="top"><ul>
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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 <a href="qbuffer.html">QBuffer</a> (using <a href="qimageio.html">QImageIO</a>) and stream
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that.
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">QMap
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<td valign="top"><ul>
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<li> The number of items (Q_UINT32)
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<li> For all items, the key and value
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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">QPalette
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<td valign="top"><ul>
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<li> active (<a href="qcolorgroup.html">QColorGroup</a>)
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<li> disabled (QColorGroup)
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<li> inactive (QColorGroup)
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">QPen
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<td valign="top"><ul>
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<li> The pen styles (Q_UINT8)
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<li> The pen width (Q_UINT8)
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<li> The pen color (<a href="qcolor.html">QColor</a>)
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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">QPicture
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<td valign="top"><ul>
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<li> The size of the picture data (Q_UINT32)
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<li> The raw bytes of picture data (char)
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">QPixmap
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<td valign="top"><ul>
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<li> Save it as a PNG image.
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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">QPoint
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<td valign="top"><ul>
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<li> The x coordinate (Q_INT32)
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<li> The y coordinate (Q_INT32)
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">QPointArray
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<td valign="top"><ul>
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<li> The array size (Q_UINT32)
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<li> The array points (<a href="qpoint.html">QPoint</a>)
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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">QRect
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<td valign="top"><ul>
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<li> left (Q_INT32)
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<li> top (Q_INT32)
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<li> right (Q_INT32)
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<li> bottom (Q_INT32)
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">QRegion
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<td valign="top"><ul>
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<li> The size of the data, i.e. 8 + 16 * (number of rectangles) (Q_UINT32)
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<li> QRGN_RECTS (Q_INT32)
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<li> The number of rectangles (Q_UINT32)
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<li> The rectangles in sequential order (<a href="qrect.html">QRect</a>)
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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">QSize
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<td valign="top"><ul>
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<li> width (Q_INT32)
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<li> height (Q_INT32)
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">QString
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<td valign="top"><ul>
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<li> If the string is null: 0xffffffff (Q_UINT32)<br>
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otherwise: The string length (Q_UINT32) followed by the
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data in UTF-16
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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">QTime
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<td valign="top"><ul>
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<li> Milliseconds since midnight (Q_UINT32)
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">QValueList
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<td valign="top"><ul>
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<li> The number of list elements (Q_UINT32)
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<li> All the elements in sequential order
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</ul>
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<tr bgcolor="#d0d0d0"> <td valign="top">QVariant
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<td valign="top"><ul>
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<li> The type of the data (Q_UINT32)
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<li> The data of the specified type
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</ul>
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<tr bgcolor="#f0f0f0"> <td valign="top">QWMatrix
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<td valign="top"><ul>
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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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</ul>
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</table></center>
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<p>
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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