MST 2004 John Fleck | d14bccc | 2004-02-15 01:57:42 +0000 | [diff] [blame] | 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> |
MST 2003 John Fleck | 731967e | 2003-01-27 00:39:50 +0000 | [diff] [blame] | 2 | </p><pre class="programlisting"> |
MDT 2002 John Fleck | 598f6eb | 2002-06-04 15:10:36 +0000 | [diff] [blame] | 3 | #include <libxml/parser.h> |
MDT 2003 John Fleck | 63f3a47 | 2003-07-24 21:48:30 +0000 | [diff] [blame] | 4 | #include <libxml/xpath.h> |
MDT 2002 John Fleck | 598f6eb | 2002-06-04 15:10:36 +0000 | [diff] [blame] | 5 | |
| 6 | xmlDocPtr |
MDT 2003 John Fleck | 63f3a47 | 2003-07-24 21:48:30 +0000 | [diff] [blame] | 7 | getdoc (char *docname) { |
MDT 2002 John Fleck | 598f6eb | 2002-06-04 15:10:36 +0000 | [diff] [blame] | 8 | xmlDocPtr doc; |
MDT 2002 John Fleck | 598f6eb | 2002-06-04 15:10:36 +0000 | [diff] [blame] | 9 | doc = xmlParseFile(docname); |
| 10 | |
| 11 | if (doc == NULL ) { |
MDT 2003 John Fleck | 63f3a47 | 2003-07-24 21:48:30 +0000 | [diff] [blame] | 12 | fprintf(stderr,"Document not parsed successfully. \n"); |
| 13 | return NULL; |
MDT 2002 John Fleck | 598f6eb | 2002-06-04 15:10:36 +0000 | [diff] [blame] | 14 | } |
MDT 2003 John Fleck | 63f3a47 | 2003-07-24 21:48:30 +0000 | [diff] [blame] | 15 | |
| 16 | return doc; |
MDT 2002 John Fleck | 598f6eb | 2002-06-04 15:10:36 +0000 | [diff] [blame] | 17 | } |
| 18 | |
MDT 2003 John Fleck | 63f3a47 | 2003-07-24 21:48:30 +0000 | [diff] [blame] | 19 | xmlXPathObjectPtr |
| 20 | getnodeset (xmlDocPtr doc, xmlChar *xpath){ |
| 21 | |
| 22 | xmlXPathContextPtr context; |
| 23 | xmlXPathObjectPtr result; |
| 24 | |
| 25 | context = xmlXPathNewContext(doc); |
MDT 2004 John Fleck | 4c3bb7d | 2004-08-25 02:51:27 +0000 | [diff] [blame] | 26 | if (context == NULL) { |
| 27 | printf("Error in xmlXPathNewContext\n"); |
| 28 | return NULL; |
| 29 | } |
MDT 2003 John Fleck | 63f3a47 | 2003-07-24 21:48:30 +0000 | [diff] [blame] | 30 | result = xmlXPathEvalExpression(xpath, context); |
MDT 2004 John Fleck | 4c3bb7d | 2004-08-25 02:51:27 +0000 | [diff] [blame] | 31 | xmlXPathFreeContext(context); |
| 32 | if (result == NULL) { |
| 33 | printf("Error in xmlXPathEvalExpression\n"); |
| 34 | return NULL; |
| 35 | } |
MDT 2003 John Fleck | 63f3a47 | 2003-07-24 21:48:30 +0000 | [diff] [blame] | 36 | if(xmlXPathNodeSetIsEmpty(result->nodesetval)){ |
MDT 2004 John Fleck | 4c3bb7d | 2004-08-25 02:51:27 +0000 | [diff] [blame] | 37 | xmlXPathFreeObject(result); |
MDT 2003 John Fleck | 63f3a47 | 2003-07-24 21:48:30 +0000 | [diff] [blame] | 38 | printf("No result\n"); |
| 39 | return NULL; |
| 40 | } |
MDT 2003 John Fleck | 63f3a47 | 2003-07-24 21:48:30 +0000 | [diff] [blame] | 41 | return result; |
| 42 | } |
MDT 2002 John Fleck | 598f6eb | 2002-06-04 15:10:36 +0000 | [diff] [blame] | 43 | int |
| 44 | main(int argc, char **argv) { |
| 45 | |
| 46 | char *docname; |
MDT 2002 John Fleck | 598f6eb | 2002-06-04 15:10:36 +0000 | [diff] [blame] | 47 | xmlDocPtr doc; |
MDT 2004 John Fleck | 218ed39 | 2004-05-28 01:49:38 +0000 | [diff] [blame] | 48 | xmlChar *xpath = (xmlChar*) "//keyword"; |
MDT 2003 John Fleck | 63f3a47 | 2003-07-24 21:48:30 +0000 | [diff] [blame] | 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]); |
MDT 2002 John Fleck | 598f6eb | 2002-06-04 15:10:36 +0000 | [diff] [blame] | 56 | return(0); |
| 57 | } |
| 58 | |
| 59 | docname = argv[1]; |
MDT 2003 John Fleck | 63f3a47 | 2003-07-24 21:48:30 +0000 | [diff] [blame] | 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); |
MST 2004 John Fleck | d14bccc | 2004-02-15 01:57:42 +0000 | [diff] [blame] | 67 | xmlFree(keyword); |
MDT 2003 John Fleck | 63f3a47 | 2003-07-24 21:48:30 +0000 | [diff] [blame] | 68 | } |
MST 2004 John Fleck | d14bccc | 2004-02-15 01:57:42 +0000 | [diff] [blame] | 69 | xmlXPathFreeObject (result); |
MDT 2002 John Fleck | 598f6eb | 2002-06-04 15:10:36 +0000 | [diff] [blame] | 70 | } |
MDT 2003 John Fleck | 63f3a47 | 2003-07-24 21:48:30 +0000 | [diff] [blame] | 71 | xmlFreeDoc(doc); |
| 72 | xmlCleanupParser(); |
MDT 2002 John Fleck | 598f6eb | 2002-06-04 15:10:36 +0000 | [diff] [blame] | 73 | return (1); |
| 74 | } |
MST 2003 John Fleck | 731967e | 2003-01-27 00:39:50 +0000 | [diff] [blame] | 75 | </pre><p> |
MDT 2003 John Fleck | 63f3a47 | 2003-07-24 21:48:30 +0000 | [diff] [blame] | 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> |