使用XPath分析XML

来源：互联网发布：淘宝的虚拟试衣间编辑：程序博客网时间：2024/05/22 06:36

#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/xpath.h>

int getXmlConfig(char *conf_file, char *obj_file_name, int name_size)
{
int xmlret = 1;
xmlKeepBlanksDefault(0);
xmlDocPtr pDoc;

pDoc = xmlParseFile(conf_file);
if (pDoc == NULL)
{
  printf("Error : no configure file!/n");
  return -1;
}
xmlXPathContextPtr xpathctx;
xpathctx = xmlXPathNewContext(pDoc);
if (xpathctx == NULL)
{
  printf("Error : fail to create xpath context!/n");
  return -1;
}

xmlXPathObjectPtr xpathobj;
xpathobj = xmlXPathEvalExpression(BAD_CAST "/test/objname", xpathctx);
if (xpathobj == NULL) {
  xmlret = -1;
}
else {
  if (xpathobj->nodesetval == NULL)
   xmlret = -1;
  else {
   int number = xpathobj->nodesetval->nodeNr;
   if(number<=0)
    return -1;
   xmlNodePtr node = xpathobj->nodesetval->nodeTab[0];
   xmlChar *nameValue = xmlNodeGetContent(node);
   snprintf(obj_file_name, name_size, "%s", nameValue);
   xmlFree(nameValue);
  }
}
xmlXPathFreeObject(xpathobj);
xmlXPathFreeContext(xpathctx);
xmlFreeDoc(pDoc);

if (xmlret < 0)
  printf("Error in config file format!/n");

return xmlret;
}
分析的文件是：

<test>

</test>

在这先记着，以后我再细细的解释。