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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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