libxml中使用xpath解析xml文件

有猫相伴的日子 — Mon, 23 Aug 2010 04:06:00 GMT

#include
#include
#include

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




    John Fleck
    June 2, 2002
    example keyword裴


    This is the headline
    This is the body text.





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libxml中使用xpath解析xml文件