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最後變更 在這個檔案從7931是 6076,由 vboxsync 提交於 17 年 前

Merged dmik/s2 branch (r25959:26751) to the trunk.

  • 屬性 svn:eol-style 設為 native
  • 屬性 svn:keywords 設為 Date Revision Author Id
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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
6xmlDocPtr
7getdoc (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
19xmlXPathObjectPtr
20getnodeset (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}
43int
44main(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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