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<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>

</p><pre class="programlisting">

#include <libxml/parser.h>

#include <libxml/xpath.h>

xmlDocPtr

getdoc (char *docname) {

xmlDocPtr doc;

doc = xmlParseFile(docname);

if (doc == NULL ) {

fprintf(stderr,"Document not parsed successfully. \n");

return NULL;

}

return doc;

}

xmlXPathObjectPtr

getnodeset (xmlDocPtr doc, xmlChar *xpath){

xmlXPathContextPtr context;

xmlXPathObjectPtr result;

context = xmlXPathNewContext(doc);

if (context == NULL) {

printf("Error in xmlXPathNewContext\n");

return NULL;

}

result = xmlXPathEvalExpression(xpath, context);

xmlXPathFreeContext(context);

if (result == NULL) {

printf("Error in xmlXPathEvalExpression\n");

return NULL;

}

if(xmlXPathNodeSetIsEmpty(result->nodesetval)){

xmlXPathFreeObject(result);

printf("No result\n");

return NULL;

}

return result;

}

int

main(int argc, char **argv) {

char *docname;

xmlDocPtr doc;

xmlChar *xpath = (xmlChar*) "//keyword";

xmlNodeSetPtr nodeset;

xmlXPathObjectPtr result;

int i;

xmlChar *keyword;

if (argc <= 1) {

printf("Usage: %s docname\n", argv[0]);

return(0);

}

docname = argv[1];

doc = getdoc(docname);

result = getnodeset (doc, xpath);

if (result) {

nodeset = result->nodesetval;

for (i=0; i < nodeset->nodeNr; i++) {

keyword = xmlNodeListGetString(doc, nodeset->nodeTab[i]->xmlChildrenNode, 1);

printf("keyword: %s\n", keyword);

xmlFree(keyword);

}

xmlXPathFreeObject (result);

}

xmlFreeDoc(doc);

xmlCleanupParser();

return (1);

}

</pre><p>

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