void parse(xmlDocPtr doc, xmlNodePtr cur)
{
 xmlChar *key;
 cur = cur->xmlChildrenNode;
 while (cur != NULL) {
  if((!xmlStrcmp(cur->name, (const xmlChar *)"port"))) {
   key = xmlNodeListGetString(doc,cur->xmlChildrenNode,1);
   printf("port: %s\n",key);
   xmlFree(key);
  }
  cur = cur->next;
 }
 return;
}

static void parseDoc(char *docname) {
 xmlDocPtr doc;
 xmlNodePtr cur;

 doc = xmlParseFile("xunlei.xml");

 if(doc == NULL) {
  fprintf(stderr,"Document not parsed successfully. \n");
  return;
 }

 cur = xmlDocGetRootElement(doc);
 printf("the root is :", cur);

 if(cur == NULL) {
  fprintf(stderr, "empty document \n");
  xmlFreeDoc(doc);
  return;
 }

 if(xmlStrcmp(cur->name, (const xmlChar *) "xunlei")) {
  fprintf(stderr,"document of the wrong type,root node != xunlei");
  xmlFreeDoc(doc);
  return;
 }

 cur = cur->xmlChildrenNode;
 while(cur != NULL) {
  if((!xmlStrcmp(cur->name,(const xmlChar *)"tcp"))) {
   parse(doc,cur);
  }
 cur = cur->next;
 }
 xmlFreeDoc(doc);
 return;
}

int main(int argc,char **argv) {
 char *docname;
 if(argc <= 1) {
  printf("Usage: %s document \n",argv[0]);
  return(0);
 }
 docname = argv[1];
 parseDoc(docname);

 return(1);
}