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194 lines
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194 lines
11 KiB
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/xml/qxml.cpp:892 -->
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<title>TQXmlInputSource Class</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>TQXmlInputSource Class Reference<br><small>[<a href="xml.html">XML module</a>]</small></h1>
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<p>The TQXmlInputSource class provides the input data for the
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TQXmlReader subclasses.
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<a href="#details">More...</a>
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<p>All the functions in this class are <a href="threads.html#reentrant">reentrant</a> when TQt is built with thread support.</p>
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<p><tt>#include <<a href="qxml-h.html">ntqxml.h</a>></tt>
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<p><a href="qxmlinputsource-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#TQXmlInputSource"><b>TQXmlInputSource</b></a> ()</li>
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<li class=fn><a href="#TQXmlInputSource-2"><b>TQXmlInputSource</b></a> ( TQIODevice * dev )</li>
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<li class=fn>TQXmlInputSource ( TQFile & file ) <em>(obsolete)</em></li>
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<li class=fn>TQXmlInputSource ( TQTextStream & stream ) <em>(obsolete)</em></li>
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<li class=fn>virtual <a href="#~TQXmlInputSource"><b>~TQXmlInputSource</b></a> ()</li>
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<li class=fn>virtual void <a href="#setData"><b>setData</b></a> ( const TQString & dat )</li>
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<li class=fn>virtual void <a href="#setData-2"><b>setData</b></a> ( const TQByteArray & dat )</li>
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<li class=fn>virtual void <a href="#fetchData"><b>fetchData</b></a> ()</li>
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<li class=fn>virtual TQString <a href="#data"><b>data</b></a> ()</li>
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<li class=fn>virtual TQChar <a href="#next"><b>next</b></a> ()</li>
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<li class=fn>virtual void <a href="#reset"><b>reset</b></a> ()</li>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn>virtual TQString <a href="#fromRawData"><b>fromRawData</b></a> ( const TQByteArray & data, bool beginning = FALSE )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQXmlInputSource class provides the input data for the
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<a href="qxmlreader.html">TQXmlReader</a> subclasses.
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<p>
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<p> All subclasses of TQXmlReader read the input XML document from this
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class.
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<p> This class recognizes the encoding of the data by reading the
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encoding declaration in the XML file if it finds one, and reading
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the data using the corresponding encoding. If it does not find an
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encoding declaration, then it assumes that the data is either in
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UTF-8 or UTF-16, depending on whether it can find a byte-order
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mark.
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<p> There are two ways to populate the input source with data: you can
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construct it with a <a href="ntqiodevice.html">TQIODevice</a>* so that the input source reads the
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data from that device. Or you can set the data explicitly with one
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of the <a href="#setData">setData</a>() functions.
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<p> Usually you either construct a TQXmlInputSource that works on a
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TQIODevice* or you construct an empty TQXmlInputSource and set the
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data with setData(). There are only rare occasions where you would
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want to mix both methods.
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<p> The TQXmlReader subclasses use the <a href="#next">next</a>() function to read the
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input character by character. If you want to start from the
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beginning again, use <a href="#reset">reset</a>().
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<p> The functions <a href="#data">data</a>() and <a href="#fetchData">fetchData</a>() are useful if you want to do
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something with the data other than parsing, e.g. displaying the
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raw XML file. The benefit of using the TQXmlInputClass in such
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cases is that it tries to use the correct encoding.
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<p> <p>See also <a href="qxmlreader.html">TQXmlReader</a>, <a href="qxmlsimplereader.html">TQXmlSimpleReader</a>, and <a href="xml-tools.html">XML</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQXmlInputSource"></a>TQXmlInputSource::TQXmlInputSource ()
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</h3>
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Constructs an input source which contains no data.
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<p> <p>See also <a href="#setData">setData</a>().
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<h3 class=fn><a name="TQXmlInputSource-2"></a>TQXmlInputSource::TQXmlInputSource ( <a href="ntqiodevice.html">TQIODevice</a> * dev )
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</h3>
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Constructs an input source and gets the data from device <em>dev</em>.
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If <em>dev</em> is not open, it is opened in read-only mode. If <em>dev</em>
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is 0 or it is not possible to read from the device, the input
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source will contain no data.
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<p> <p>See also <a href="#setData">setData</a>(), <a href="#fetchData">fetchData</a>(), and <a href="ntqiodevice.html">TQIODevice</a>.
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<h3 class=fn><a name="TQXmlInputSource-3"></a>TQXmlInputSource::TQXmlInputSource ( <a href="ntqfile.html">TQFile</a> & file )
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</h3> <b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
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<p> Constructs an input source and gets the data from the file <em>file</em>. If the
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file cannot be read the input source is empty.
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<h3 class=fn><a name="TQXmlInputSource-4"></a>TQXmlInputSource::TQXmlInputSource ( <a href="ntqtextstream.html">TQTextStream</a> & stream )
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</h3> <b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
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<p> Constructs an input source and gets the data from the text stream <em>stream</em>.
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<h3 class=fn><a name="~TQXmlInputSource"></a>TQXmlInputSource::~TQXmlInputSource ()<tt> [virtual]</tt>
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</h3>
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Destructor.
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<h3 class=fn><a href="ntqstring.html">TQString</a> <a name="data"></a>TQXmlInputSource::data ()<tt> [virtual]</tt>
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</h3>
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Returns the data the input source contains or <a href="ntqstring.html#TQString-null">TQString::null</a> if the
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input source does not contain any data.
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<p> <p>See also <a href="#setData">setData</a>(), <a href="#TQXmlInputSource">TQXmlInputSource</a>(), and <a href="#fetchData">fetchData</a>().
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<h3 class=fn>void <a name="fetchData"></a>TQXmlInputSource::fetchData ()<tt> [virtual]</tt>
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</h3>
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This function reads more data from the device that was set during
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construction. If the input source already contained data, this
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function deletes that data first.
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<p> This object contains no data after a call to this function if the
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object was constructed without a device to read data from or if
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this function was not able to get more data from the device.
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<p> There are two occasions where a fetch is done implicitly by
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another function call: during construction (so that the object
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starts out with some initial data where available), and during a
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call to <a href="#next">next</a>() (if the data had run out).
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<p> You don't normally need to use this function if you use next().
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<p> <p>See also <a href="#data">data</a>(), <a href="#next">next</a>(), and <a href="#TQXmlInputSource">TQXmlInputSource</a>().
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<h3 class=fn><a href="ntqstring.html">TQString</a> <a name="fromRawData"></a>TQXmlInputSource::fromRawData ( const <a href="qbytearray.html">TQByteArray</a> & data, bool beginning = FALSE )<tt> [virtual protected]</tt>
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</h3>
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This function reads the XML file from <em>data</em> and tries to
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recognize the encoding. It converts the raw data <em>data</em> into a
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<a href="ntqstring.html">TQString</a> and returns it. It tries its best to get the correct
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encoding for the XML file.
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<p> If <em>beginning</em> is TRUE, this function assumes that the data
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starts at the beginning of a new XML document and looks for an
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encoding declaration. If <em>beginning</em> is FALSE, it converts the
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raw data using the encoding determined from prior calls.
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<h3 class=fn><a href="qchar.html">TQChar</a> <a name="next"></a>TQXmlInputSource::next ()<tt> [virtual]</tt>
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</h3>
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Returns the next character of the input source. If this function
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reaches the end of available data, it returns
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TQXmlInputSource::EndOfData. If you call <a href="#next">next</a>() after that, it
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tries to fetch more data by calling <a href="#fetchData">fetchData</a>(). If the
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fetchData() call results in new data, this function returns the
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first character of that data; otherwise it returns
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TQXmlInputSource::EndOfDocument.
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<p> <p>See also <a href="#reset">reset</a>(), <a href="#fetchData">fetchData</a>(), <a href="qxmlsimplereader.html#parse">TQXmlSimpleReader::parse</a>(), and <a href="qxmlsimplereader.html#parseContinue">TQXmlSimpleReader::parseContinue</a>().
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<h3 class=fn>void <a name="reset"></a>TQXmlInputSource::reset ()<tt> [virtual]</tt>
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</h3>
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This function sets the position used by <a href="#next">next</a>() to the beginning of
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the data returned by <a href="#data">data</a>(). This is useful if you want to use the
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input source for more than one parse.
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<p> <p>See also <a href="#next">next</a>().
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<p>Example: <a href="tagreader-with-features-example.html#x1975">xml/tagreader-with-features/tagreader.cpp</a>.
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<h3 class=fn>void <a name="setData"></a>TQXmlInputSource::setData ( const <a href="ntqstring.html">TQString</a> & dat )<tt> [virtual]</tt>
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</h3>
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Sets the data of the input source to <em>dat</em>.
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<p> If the input source already contains data, this function deletes
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that data first.
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<p> <p>See also <a href="#data">data</a>().
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<h3 class=fn>void <a name="setData-2"></a>TQXmlInputSource::setData ( const <a href="qbytearray.html">TQByteArray</a> & dat )<tt> [virtual]</tt>
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> The data <em>dat</em> is passed through the correct text-codec, before
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it is set.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">TQt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<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>TQt 3.3.8</div>
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