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#include <libxml/parser.h>                                                             

#include <libxml/xpath.h>                                                               #include <stdio.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);                                                                           }                                                                                                                                                                                                                                                                                                                                                              

 

 

demo.xml

 

<?xml version="1.0" encoding="UTF-8"?>                 

<story>                                                   <storyinfo>                                               <author>John Fleck</author>                             <datewritten>June 2, 2002</datewritten>                 <keyword>example keyword裴</keyword>                   </storyinfo>                                            <body>                                                    <headline>This is the headline</headline>               <para>This is the body text.</para>                   </body>                                               </story>                                               

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