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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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