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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 <libxml/parser.h>
! 4: #include <libxml/xpath.h>
! 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->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 <= 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->nodesetval;
! 64: for (i=0; i < nodeset->nodeNr; i++) {
! 65: keyword = xmlNodeListGetString(doc, nodeset->nodeTab[i]->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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