RegQuery.java

package es.uji.security.util;

import java.io.InputStream;
import java.io.StringWriter;

public class RegQuery
{
    private String REGQUERY_UTIL = "reg query ";
    private String REGSTR_TOKEN = "REG_SZ";
    private String APP_DATA_CMD = REGQUERY_UTIL
            + "\"HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Shell Folders\" /v APPDATA";
    private String APP_PATH_CMD = REGQUERY_UTIL
            + "\"HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\";

    private String _execAndGetValue(String cmd)
    {
        int c;
        String res = null;
        StringWriter sw = new StringWriter();

        // System.out.println("Ejecutando y obteniendo valor ... ");
        try
        {
            InputStream in = Runtime.getRuntime().exec(cmd).getInputStream();

            // System.out.println("Obtenido stream: ");

            while ((c = in.read()) != -1)
            {
                // System.out.println("c=" + c);
                sw.write(c);
            }
            // System.out.println();

            in.close();
            res = sw.toString();
            // System.out.println("res: " + res );
            int p = res.indexOf(REGSTR_TOKEN);

            if (p == -1)
            {
                return null;
            }

            return res.substring(p + REGSTR_TOKEN.length()).trim();
        }
        catch (Exception e)
        {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * Get the Application Data directory in windows.
     * 
     * @return A string with that path.
     */
    public String getCurrentUserPersonalFolderPath()
    {
        // System.out.println("Ejecutando: " + APP_DATA_CMD);
        return _execAndGetValue(APP_DATA_CMD);
    }

    /**
     * Get the Application Data directory in windows.
     * 
     * @param execName
     * @return A string with that path.
     */
    public String getAbsoluteApplicationPath(String execName)
    {
        APP_PATH_CMD += execName + "\"" + " /v Path";
        return _execAndGetValue(APP_PATH_CMD);
    }
}