void CScanComputer::saveParameters(const char *filename)
{
 
   ParamIO outXml;//ParamIO.h is pasted below this  
 
   writeParameters(outXml); 
   outXml.writeFile(filename);
}
 
void CScanComputer::writeParameters(ParamIO &outXml)
{
 
	outXml.write("PARAMS:NAME",fname1);//fname1 is the string variable where i am getting the value 
	outXml.write("PARAMS:EMAILID",Path1);//Path1i s the string variable where i am getting the value 
 
	outXml.write("PARAMS:DOB",cell2);//cell2is the string variable where i am getting the value 
 
 
}

#include "ParamIO.h"
 
void ParamIO::parseAccess(const char *str, std::vector<std::string> &access)
{
	access.clear();
   if(str == 0 || strlen(str) == 0)
   {
      return;
   }
   std::istringstream stream(str);
   char *char_str = new char[strlen(str)];
   while(stream.getline(char_str, strlen(str), ':'))
	{
		access.push_back(std::string(char_str));
	}
   delete[] char_str;
 
}
 
void ParamIO::writeStream(std::ostream &os) const
{
	_treeBuilder.print(os);
}
 
 
 
void ParamIO::writeFile(const char *filename) const
{
	std::ofstream os(filename);
	writeStream(os);
	os.close();
}

<PARAMS>
  <NAME>003BEC20</NAME> //instead of the value of the string variable it is taking as 003BEC20 etc
  <EMAILID>01970328</EMAILID> 
  <DOB>003BEEA0</DOB> 
  </PARAMS>