xml reader class for vc++

#include <iostream>
#include <string.h>
using namespace std;

    string s_x;
    char x;
    bool getvalue_x,parameter_x,q_x;

class Cxml
{
public:
    string gv;

    Cxml()
    {s_x="<";
        getvalue_x=false;parameter_x=false;q_x=true;
    }




    string xml_getvalue(char* filename, string s2_x);
};


string Cxml::xml_getvalue(char* filename, string s2_x)
{
    s2_x+=">";
    FILE *fp = fopen(filename,"r");
    while(1)
    {
        x=getc(fp);

        if(getvalue_x)
        {
            if(x=='\n')
                gv="";
            if((x>47&&x<58)||(x>90&&x<123))
                gv+=x;
            if(x=='<')
            {
                getvalue_x=false;
                string vg =gv;
                gv="";
                return vg;
            }
                //else
                    //gv="";
        }

        if(x=='<'||parameter_x)
        {
            if(x==' ')
                s_x+='>';
            else
                s_x+=x;
            parameter_x=true;






        }

        if(parameter_x)
        {
            if(x==' '||x=='>')
            {



                if(s_x==s2_x)
                {


                    while(x!='>')
                        x=getc(fp);
                    getvalue_x=true;
                }
                s_x="";
                parameter_x=false;
            }
        }



    }
    fclose(fp);
}