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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> </p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="apc.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="ape.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">C.�Code for Keyword Example�</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">�E.�Code for Add Keyword Example</td></tr></table></div></body></html>