xmlreadfile.C

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/// \file
/// \ingroup tutorial_xml
/// \notebook -nodraw
/// Example to read and parse any xml file, supported by TXMLEngine class
/// The input file, produced by xmlnewfile.C macro is used
/// If you need full xml syntax support, use TXMLParser instead
///
/// \macro_output
/// \macro_code
///
/// \author Sergey Linev

#include "TXMLEngine.h"

void DisplayNode(TXMLEngine* xml, XMLNodePointer_t node, Int_t level);

void xmlreadfile(const char* filename = "example.xml")
{
   // First create engine
   TXMLEngine* xml = new TXMLEngine;

   // Now try to parse xml file
   // Only file with restricted xml syntax are supported
   XMLDocPointer_t xmldoc = xml->ParseFile(filename);
   if (xmldoc==0) {
      delete xml;
      return;
   }

   // take access to main node
   XMLNodePointer_t mainnode = xml->DocGetRootElement(xmldoc);

   // display recursively all nodes and subnodes
   DisplayNode(xml, mainnode, 1);

   // Release memory before exit
   xml->FreeDoc(xmldoc);
   delete xml;
}

void DisplayNode(TXMLEngine* xml, XMLNodePointer_t node, Int_t level)
{
   // this function display all accessible information about xml node and its children

   printf("%*c node: %s\n",level,' ', xml->GetNodeName(node));

   // display namespace
   XMLNsPointer_t ns = xml->GetNS(node);
   if (ns!=0)
      printf("%*c namespace: %s refer: %s\n",level+2,' ', xml->GetNSName(ns), xml->GetNSReference(ns));

   // display attributes
   XMLAttrPointer_t attr = xml->GetFirstAttr(node);
   while (attr!=0) {
       printf("%*c attr: %s value: %s\n",level+2,' ', xml->GetAttrName(attr), xml->GetAttrValue(attr));
       attr = xml->GetNextAttr(attr);
   }

   // display content (if exists)
   const char* content = xml->GetNodeContent(node);
   if (content!=0)
      printf("%*c cont: %s\n",level+2,' ', content);

   // display all child nodes
   XMLNodePointer_t child = xml->GetChild(node);
   while (child!=0) {
      DisplayNode(xml, child, level+2);
      child = xml->GetNext(child);
   }
}