| 1 | <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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| 2 | </p><pre class="programlisting">
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| 3 | #include <libxml/parser.h>
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| 4 | #include <libxml/xpath.h>
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| 5 |
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| 6 | xmlDocPtr
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| 7 | getdoc (char *docname) {
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| 8 | xmlDocPtr doc;
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| 9 | doc = xmlParseFile(docname);
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| 10 |
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| 11 | if (doc == NULL ) {
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| 12 | fprintf(stderr,"Document not parsed successfully. \n");
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| 13 | return NULL;
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| 14 | }
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| 15 |
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| 16 | return doc;
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| 17 | }
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| 18 |
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| 19 | xmlXPathObjectPtr
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| 20 | getnodeset (xmlDocPtr doc, xmlChar *xpath){
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| 21 |
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| 22 | xmlXPathContextPtr context;
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| 23 | xmlXPathObjectPtr result;
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| 24 |
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| 25 | context = xmlXPathNewContext(doc);
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| 26 | if (context == NULL) {
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| 27 | printf("Error in xmlXPathNewContext\n");
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| 28 | return NULL;
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| 29 | }
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| 30 | result = xmlXPathEvalExpression(xpath, context);
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| 31 | xmlXPathFreeContext(context);
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| 32 | if (result == NULL) {
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| 33 | printf("Error in xmlXPathEvalExpression\n");
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| 34 | return NULL;
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| 35 | }
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| 36 | if(xmlXPathNodeSetIsEmpty(result->nodesetval)){
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| 37 | xmlXPathFreeObject(result);
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| 38 | printf("No result\n");
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| 39 | return NULL;
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| 40 | }
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| 41 | return result;
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| 42 | }
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| 43 | int
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| 44 | main(int argc, char **argv) {
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| 45 |
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| 46 | char *docname;
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| 47 | xmlDocPtr doc;
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| 48 | xmlChar *xpath = (xmlChar*) "//keyword";
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| 49 | xmlNodeSetPtr nodeset;
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| 50 | xmlXPathObjectPtr result;
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| 51 | int i;
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| 52 | xmlChar *keyword;
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| 53 |
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| 54 | if (argc <= 1) {
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| 55 | printf("Usage: %s docname\n", argv[0]);
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| 56 | return(0);
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| 57 | }
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| 58 |
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| 59 | docname = argv[1];
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| 60 | doc = getdoc(docname);
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| 61 | result = getnodeset (doc, xpath);
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| 62 | if (result) {
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| 63 | nodeset = result->nodesetval;
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| 64 | for (i=0; i < nodeset->nodeNr; i++) {
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| 65 | keyword = xmlNodeListGetString(doc, nodeset->nodeTab[i]->xmlChildrenNode, 1);
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| 66 | printf("keyword: %s\n", keyword);
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| 67 | xmlFree(keyword);
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| 68 | }
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| 69 | xmlXPathFreeObject (result);
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| 70 | }
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| 71 | xmlFreeDoc(doc);
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| 72 | xmlCleanupParser();
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| 73 | return (1);
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| 74 | }
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| 75 | </pre><p>
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| 76 | </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>
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