| <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> |