doc/html/datastreamformat.html


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<title>Format of the TQDataStream 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 TQDataStream Operators</h1>


<p> The <a href="tqdatastream.html">TQDataStream</a> allows you to serialize some of the TQt data types.
The table below lists the data types that <a href="tqdatastream.html">TQDataStream</a> can serialize
and how they are represented.
<p> It is best to always cast integers to a TQt integer type when writing,
and to read back into the same TQt integer type when reading.
<p> <center><table cellpadding="4" cellspacing="2" border="0">
<tr bgcolor="#f0f0f0"> <td valign="top">TQ_INT8
<td valign="top"><ul>
<li> signed byte
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">TQ_INT16
<td valign="top"><ul>
<li> signed 16 bit integer
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQ_INT32
<td valign="top"><ul>
<li> signed 32 bit integer
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">TQ_UINT8
<td valign="top"><ul>
<li> unsigned byte
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQ_UINT16
<td valign="top"><ul>
<li> unsigned 16 bit integer
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">TQ_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 (TQ_UINT32)
<li> The string bytes including the terminating 0
</ul>
The null string is represented as <tt>(TQ_UINT32) 0</tt>.
<tr bgcolor="#d0d0d0"> <td valign="top">TQBitArray
<td valign="top"><ul>
<li> The array size (TQ_UINT32)
<li> The array bits, i.e. (size + 7)/8 bytes
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQBrush
<td valign="top"><ul>
<li> The brush style (TQ_UINT8)
<li> The brush color (<a href="tqcolor.html">TQColor</a>)
<li> If style is CustomPattern, the brush pixmap (<a href="tqpixmap.html">TQPixmap</a>)
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">TQByteArray
<td valign="top"><ul>
<li> The array size (TQ_UINT32)
<li> The array bytes, i.e. size bytes
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQCString
<td valign="top"><ul>
<li> The size of the string including the terminating 0 (TQ_UINT32)
<li> The string bytes including the terminating 0
</ul>
The null string is represented as <tt>(TQ_UINT32) 0</tt>.
<tr bgcolor="#d0d0d0"> <td valign="top"><a href="tqcolor.html">TQColor</a>
<td valign="top"><ul><li> RGB value serialized as a TQ_UINT32 </ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQColorGroup
<td valign="top"><ul>
<li> foreground (<a href="tqbrush.html">TQBrush</a>)
<li> button (TQBrush)
<li> light (TQBrush)
<li> midLight (TQBrush)
<li> dark (TQBrush)
<li> mid (TQBrush)
<li> text (TQBrush)
<li> brightText (TQBrush)
<li> ButtonText (TQBrush)
<li> base (TQBrush)
<li> background (TQBrush)
<li> shadow (TQBrush)
<li> highlight (TQBrush)
<li> highlightedText (TQBrush)
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">TQCursor
<td valign="top"><ul>
<li> Shape id (TQ_INT16)
<li> If shape is BitmapCursor: The bitmap (<a href="tqpixmap.html">TQPixmap</a>), mask (TQPixmap) and hot spot (<a href="tqpoint.html">TQPoint</a>)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQDate
<td valign="top"><ul>
<li> Julian day (TQ_UINT32)
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">TQDateTime
<td valign="top"><ul>
<li> Date (<a href="tqdate.html">TQDate</a>)
<li> Time (<a href="tqtime.html">TQTime</a>)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQFont
<td valign="top"><ul>
<li> The family (<a href="tqcstring.html">TQCString</a>)
<li> The point size (TQ_INT16)
<li> The style hint (TQ_UINT8)
<li> The char set (TQ_UINT8)
<li> The weight (TQ_UINT8)
<li> The font bits (TQ_UINT8)
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">TQImage
<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="tqbuffer.html">TQBuffer</a> (using <a href="tqimageio.html">TQImageIO</a>) and stream
that.
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQMap
<td valign="top"><ul>
<li> The number of items (TQ_UINT32)
<li> For all items, the key and value
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">TQPalette
<td valign="top"><ul>
<li> active (<a href="tqcolorgroup.html">TQColorGroup</a>)
<li> disabled (TQColorGroup)
<li> inactive (TQColorGroup)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQPen
<td valign="top"><ul>
<li> The pen styles (TQ_UINT8)
<li> The pen width (TQ_UINT8)
<li> The pen color (<a href="tqcolor.html">TQColor</a>)
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">TQPicture
<td valign="top"><ul>
<li> The size of the picture data (TQ_UINT32)
<li> The raw bytes of picture data (char)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQPixmap
<td valign="top"><ul>
<li> Save it as a PNG image.
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">TQPoint
<td valign="top"><ul>
<li> The x coordinate (TQ_INT32)
<li> The y coordinate (TQ_INT32)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQPointArray
<td valign="top"><ul>
<li> The array size (TQ_UINT32)
<li> The array points (<a href="tqpoint.html">TQPoint</a>)
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">TQRect
<td valign="top"><ul>
<li> left (TQ_INT32)
<li> top (TQ_INT32)
<li> right (TQ_INT32)
<li> bottom (TQ_INT32)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQRegion
<td valign="top"><ul>
<li> The size of the data, i.e. 8 + 16 * (number of rectangles) (TQ_UINT32)
<li> TQRGN_RECTS (TQ_INT32)
<li> The number of rectangles (TQ_UINT32)
<li> The rectangles in sequential order (<a href="tqrect.html">TQRect</a>)
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">TQSize
<td valign="top"><ul>
<li> width (TQ_INT32)
<li> height (TQ_INT32)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQString
<td valign="top"><ul>
<li> If the string is null: 0xffffffff (TQ_UINT32)<br>
otherwise: The string length (TQ_UINT32) followed by the
data in UTF-16
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">TQTime
<td valign="top"><ul>
<li> Milliseconds since midnight (TQ_UINT32)
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQValueList
<td valign="top"><ul>
<li> The number of list elements (TQ_UINT32)
<li> All the elements in sequential order
</ul>
<tr bgcolor="#d0d0d0"> <td valign="top">TQVariant
<td valign="top"><ul>
<li> The type of the data (TQ_UINT32)
<li> The data of the specified type
</ul>
<tr bgcolor="#f0f0f0"> <td valign="top">TQWMatrix
<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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