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Tue Feb 21 23:37:59 2012 UTC (12 years, 4 months ago) by misho
Branches: libxml2, MAIN
CVS tags: v2_9_1p0, v2_9_1, v2_8_0p0, v2_8_0, v2_7_8, HEAD

libxml2

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>