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