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1N/A<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>D.�Code for XPath Example</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="apc.html" title="C.�Code for Keyword Example"><link rel="next" href="ape.html" title="E.�Code for Add Keyword Example"></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">D.�Code for XPath Example</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="apc.html">Prev</a>�</td><th width="60%" align="center">�</th><td width="20%" align="right">�<a accesskey="n" href="ape.html">Next</a></td></tr></table><hr></div><div class="appendix" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="xpathappendix"></a>D.�Code for XPath Example</h2></div></div><div></div></div><p>
1N/A </p><pre class="programlisting">
1N/A#include &lt;libxml/parser.h&gt;
1N/A#include &lt;libxml/xpath.h&gt;
1N/A
1N/AxmlDocPtr
1N/Agetdoc (char *docname) {
1N/A xmlDocPtr doc;
1N/A doc = xmlParseFile(docname);
1N/A
1N/A if (doc == NULL ) {
1N/A fprintf(stderr,"Document not parsed successfully. \n");
1N/A return NULL;
1N/A }
1N/A
1N/A return doc;
1N/A}
1N/A
1N/AxmlXPathObjectPtr
1N/Agetnodeset (xmlDocPtr doc, xmlChar *xpath){
1N/A
1N/A xmlXPathContextPtr context;
1N/A xmlXPathObjectPtr result;
1N/A
1N/A context = xmlXPathNewContext(doc);
1N/A if (context == NULL) {
1N/A printf("Error in xmlXPathNewContext\n");
1N/A return NULL;
1N/A }
1N/A result = xmlXPathEvalExpression(xpath, context);
1N/A xmlXPathFreeContext(context);
1N/A if (result == NULL) {
1N/A printf("Error in xmlXPathEvalExpression\n");
1N/A return NULL;
1N/A }
1N/A if(xmlXPathNodeSetIsEmpty(result-&gt;nodesetval)){
1N/A xmlXPathFreeObject(result);
1N/A printf("No result\n");
1N/A return NULL;
1N/A }
1N/A return result;
1N/A}
1N/Aint
1N/Amain(int argc, char **argv) {
1N/A
1N/A char *docname;
1N/A xmlDocPtr doc;
1N/A xmlChar *xpath = (xmlChar*) "//keyword";
1N/A xmlNodeSetPtr nodeset;
1N/A xmlXPathObjectPtr result;
1N/A int i;
1N/A xmlChar *keyword;
1N/A
1N/A if (argc &lt;= 1) {
1N/A printf("Usage: %s docname\n", argv[0]);
1N/A return(0);
1N/A }
1N/A
1N/A docname = argv[1];
1N/A doc = getdoc(docname);
1N/A result = getnodeset (doc, xpath);
1N/A if (result) {
1N/A nodeset = result-&gt;nodesetval;
1N/A for (i=0; i &lt; nodeset-&gt;nodeNr; i++) {
1N/A keyword = xmlNodeListGetString(doc, nodeset-&gt;nodeTab[i]-&gt;xmlChildrenNode, 1);
1N/A printf("keyword: %s\n", keyword);
1N/A xmlFree(keyword);
1N/A }
1N/A xmlXPathFreeObject (result);
1N/A }
1N/A xmlFreeDoc(doc);
1N/A xmlCleanupParser();
1N/A return (1);
1N/A}
1N/A</pre><p>
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