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Tue Feb 21 23:37:59 2012 UTC (12 years, 4 months ago) by misho
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1: <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Writing element content</title><meta name="generator" content="DocBook XSL Stylesheets V1.61.2"><link rel="home" href="index.html" title="Libxml Tutorial"><link rel="up" href="index.html" title="Libxml Tutorial"><link rel="previous" href="ar01s05.html" title="Using XPath to Retrieve Element Content"><link rel="next" href="ar01s07.html" title="Writing Attribute"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Writing element content</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ar01s05.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="ar01s07.html">Next</a></td></tr></table><hr></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="xmltutorialwritingcontent"></a>Writing element content</h2></div></div><div></div></div><p><a class="indexterm" name="id2586968"></a> 2: Writing element content uses many of the same steps we used above 3: — parsing the document and walking the tree. We parse the document, 4: then traverse the tree to find the place we want to insert our element. For 5: this example, we want to again find the "storyinfo" element and 6: this time insert a keyword. Then we'll write the file to disk. Full code: 7: <a href="ape.html" title="E. Code for Add Keyword Example">Appendix E, <i>Code for Add Keyword Example</i></a></p><p> 8: The main difference in this example is in 9: <tt class="function">parseStory</tt>: 10: 11: </p><pre class="programlisting"> 12: void 13: parseStory (xmlDocPtr doc, xmlNodePtr cur, char *keyword) { 14: 15: <a name="addkeyword"></a><img src="images/callouts/1.png" alt="1" border="0"> xmlNewTextChild (cur, NULL, "keyword", keyword); 16: return; 17: } 18: </pre><p> 19: </p><div class="calloutlist"><table border="0" summary="Callout list"><tr><td width="5%" valign="top" align="left"><a href="#addkeyword"><img src="images/callouts/1.png" alt="1" border="0"></a> </td><td valign="top" align="left"><p>The <tt class="function"><a href="http://xmlsoft.org/html/libxml-tree.html#XMLNEWTEXTCHILD" target="_top">xmlNewTextChild</a></tt> 20: function adds a new child element at the 21: current node pointer's location in the 22: tree, specified by <tt class="varname">cur</tt>.</p></td></tr></table></div><p> 23: </p><p> 24: <a class="indexterm" name="id2587052"></a> 25: Once the node has been added, we would like to write the document to 26: file. Is you want the element to have a namespace, you can add it here as 27: well. In our case, the namespace is NULL. 28: </p><pre class="programlisting"> 29: xmlSaveFormatFile (docname, doc, 1); 30: </pre><p> 31: The first parameter is the name of the file to be written. You'll notice 32: it is the same as the file we just read. In this case, we just write over 33: the old file. The second parameter is a pointer to the xmlDoc 34: structure. Setting the third parameter equal to one ensures indenting on output. 35: </p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ar01s05.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="index.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ar01s07.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Using XPath to Retrieve Element Content </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Writing Attribute</td></tr></table></div></body></html>