<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>
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</p><pre class="programlisting">
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#include <libxml/parser.h>
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#include <libxml/xpath.h>
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xmlDocPtr
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getdoc (char *docname) {
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xmlDocPtr doc;
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doc = xmlParseFile(docname);
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if (doc == NULL ) {
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fprintf(stderr,"Document not parsed successfully. \n");
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return NULL;
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}
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return doc;
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}
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xmlXPathObjectPtr
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getnodeset (xmlDocPtr doc, xmlChar *xpath){
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xmlXPathContextPtr context;
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xmlXPathObjectPtr result;
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context = xmlXPathNewContext(doc);
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if (context == NULL) {
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printf("Error in xmlXPathNewContext\n");
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return NULL;
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}
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result = xmlXPathEvalExpression(xpath, context);
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xmlXPathFreeContext(context);
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if (result == NULL) {
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printf("Error in xmlXPathEvalExpression\n");
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return NULL;
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}
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if(xmlXPathNodeSetIsEmpty(result->nodesetval)){
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xmlXPathFreeObject(result);
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printf("No result\n");
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return NULL;
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}
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return result;
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}
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int
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main(int argc, char **argv) {
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char *docname;
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xmlDocPtr doc;
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xmlChar *xpath = (xmlChar*) "//keyword";
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xmlNodeSetPtr nodeset;
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xmlXPathObjectPtr result;
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int i;
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xmlChar *keyword;
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if (argc <= 1) {
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printf("Usage: %s docname\n", argv[0]);
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return(0);
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}
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docname = argv[1];
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doc = getdoc(docname);
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result = getnodeset (doc, xpath);
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if (result) {
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nodeset = result->nodesetval;
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for (i=0; i < nodeset->nodeNr; i++) {
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keyword = xmlNodeListGetString(doc, nodeset->nodeTab[i]->xmlChildrenNode, 1);
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printf("keyword: %s\n", keyword);
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xmlFree(keyword);
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}
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xmlXPathFreeObject (result);
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}
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xmlFreeDoc(doc);
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xmlCleanupParser();
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return (1);
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}
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</pre><p>
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