kc3-lang/libxml2/doc/tutorial/includexpath.c

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• Hash : 4c3bb7d8
  Author :
  Date : 2004-08-25T02:51:27
  

  doc/tutorial/xmltutorial.xml, xmltutorial.pdf, *.html fix Xpath memory
  
  
  Tue Aug 24 20:49:15 MDT 2004 John Fleck <jfleck@inkstain.net>
  
  	* doc/tutorial/xmltutorial.xml, xmltutorial.pdf, *.html
  	fix Xpath memory leak (thanks to sKaBoy and William Brack)
  

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• doc/tutorial/includexpath.c

• <![CDATA[
  #include <libxml/parser.h>
  #include <libxml/xpath.h>
  
  xmlDocPtr
  getdoc (char *docname) {
  	xmlDocPtr doc;
  	doc = xmlParseFile(docname);
  	
  	if (doc == NULL ) {
  		fprintf(stderr,"Document not parsed successfully. \n");
  		return NULL;
  	}
  
  	return doc;
  }
  
  xmlXPathObjectPtr
  getnodeset (xmlDocPtr doc, xmlChar *xpath){
  	
  	xmlXPathContextPtr context;
  	xmlXPathObjectPtr result;
  
  	context = xmlXPathNewContext(doc);
  	if (context == NULL) {
  		printf("Error in xmlXPathNewContext\n");
  		return NULL;
  	}
  	result = xmlXPathEvalExpression(xpath, context);
  	xmlXPathFreeContext(context);
  	if (result == NULL) {
  		printf("Error in xmlXPathEvalExpression\n");
  		return NULL;
  	}
  	if(xmlXPathNodeSetIsEmpty(result->nodesetval)){
  		xmlXPathFreeObject(result);
                  printf("No result\n");
  		return NULL;
  	}
  	return result;
  }
  int
  main(int argc, char **argv) {
  
  	char *docname;
  	xmlDocPtr doc;
  	xmlChar *xpath = (xmlChar*) "//keyword";
  	xmlNodeSetPtr nodeset;
  	xmlXPathObjectPtr result;
  	int i;
  	xmlChar *keyword;
  		
  	if (argc <= 1) {
  		printf("Usage: %s docname\n", argv[0]);
  		return(0);
  	}
  
  	docname = argv[1];
  	doc = getdoc(docname);
  	result = getnodeset (doc, xpath);
  	if (result) {
  		nodeset = result->nodesetval;
  		for (i=0; i < nodeset->nodeNr; i++) {
  			keyword = xmlNodeListGetString(doc, nodeset->nodeTab[i]->xmlChildrenNode, 1);
  		printf("keyword: %s\n", keyword);
  		xmlFree(keyword);
  		}
  		xmlXPathFreeObject (result);
  	}
  	xmlFreeDoc(doc);
  	xmlCleanupParser();
  	return (1);
  }
  ]]>

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