Loading Age and information beside the name in my training-faces xml file

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Based on this article some code : EMGU Multiple Face Recognition using PCA and Parallel Optimisation[^]

HTML

// The trainingfaces file

 <?xml version="1.0" encoding="utf-8"?>
 <Faces_For_Training>
 <FACE>
 <NAME>john</NAME>
 <Age>25</Age>
 <informations>Student in MS university</informations>
 <FILE>face_john 25Student in MS university_905807542.jpg</FILE>
 </FACE>
 <FACE>
 <NAME>mark</NAME>
 <Age>40</Age>
<informations>engineer ....</informations>
<FILE>face_mark 40engineer ....._390671740.jpg</FILE>
</FACE>
</Faces_For_Training>

I did apply step to save extra information's but failed to load it

private bool LoadTrainingData(string Folder_location)
{
    if (File.Exists(Folder_location +"\\TrainedLabels.xml"))
    {
        try
        {
            //message_bar.Text = "";
            Names_List.Clear();
            Names_List_ID.Clear();
            trainingImages.Clear();
            FileStream filestream = File.OpenRead(Folder_location + "\\TrainedLabels.xml");
            long filelength = filestream.Length;
            byte[] xmlBytes = new byte[filelength];
            filestream.Read(xmlBytes, 0, (int)filelength);
            filestream.Close();

            MemoryStream xmlStream = new MemoryStream(xmlBytes);

            using (XmlReader xmlreader = XmlTextReader.Create(xmlStream))
            {
                while (xmlreader.Read())
                {
                    if (xmlreader.IsStartElement())
                    {
                        switch (xmlreader.Name)
                        {
                            case "NAME":
                                if (xmlreader.Read())
                                {
                                    Names_List_ID.Add(Names_List.Count); //0, 1, 2, 3....
                                    Names_List.Add(xmlreader.Value.Trim());
                                    NumLabels += 3;


                                }
                                break;
                            case "FILE":
                                if (xmlreader.Read())
                                {
                                    //PROBLEM HERE IF TRAININGG MOVED
                                    trainingImages.Add(new Image<Gray, byte>(Application.StartupPath + "\\TrainedFaces\\" + xmlreader.Value.Trim()));
                                }
                                break;
                           // case "Age":
                               //   if (xmlreader.Read())
                                  //{
                                  //    Age_List.Add(xmlreader.Value.Trim());


                               //   }
                                // break;
                        }
                    }
                }
            }
            ContTrain = NumLabels;

Can anybody help me to lead me to right way to load Age and information's beside the name . it load only the name and I tried several ways to load it with name but I failed .

Posted 10-Apr-14 1:53am

cazanova007

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gggustafson · Accepted Answer · 2014-04-10T08:20:00

In the following fragment, load_training_data does what you want using XPath[^].

C#

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Xml;

namespace LoadingFace
    {

    public partial class LoadingFace : Form
        {
                                        // file in project/bin/Debug
        const string PATH = @"TrainedLabels.xml";
                                        // lists
        List < string > ages = new List<string> ( );
        List < string > files = new List<string> ( );
        List < string > informations = new List<string> ( );
        List < string > names = new List<string> ( );

        // *********************************************** LoadingFace

        public LoadingFace ( )
            {
            InitializeComponent ( );

            load_training_data ( PATH );
            }

        // *********************************** retrieved_training_data

        string retrieved_training_data ( XmlNode  root,
                                         string   item )
            {
            string  inner_text;
            XmlNode node = null;

            try
                {
                node = root.SelectSingleNode ( item );
                inner_text = node.InnerText.Trim ( );
                }
            catch
                {
                inner_text = String.Empty;
                }

            return ( inner_text );
            }

        // **************************************** load_training_data

        void load_training_data ( string path )
            {

            try
                {
                XmlNodeList node_list;
                XmlNode     root;
                XmlDocument xml_document = new XmlDocument ( );

                ages.Clear ( );
                files.Clear ( );
                informations.Clear ( );
                names.Clear ( );

                xml_document.Load ( path );
                root = xml_document.DocumentElement;
                node_list = root.SelectNodes ( "face" );
                foreach ( XmlNode node in node_list )
                    {
                    string  age = String.Empty;
                    string  file = String.Empty;
                    string  information = String.Empty;
                    string  name = String.Empty;

                    age = retrieved_training_data ( node, "age" );
                    ages.Add ( age );

                    file = retrieved_training_data ( node, "file" );
                    files.Add ( file );

                    information = retrieved_training_data ( 
                                                    node, 
                                                    "informations" );
                    informations.Add ( information );

                    name = retrieved_training_data ( node, "name" );
                    names.Add ( name );
                    }
                }
            catch ( Exception ex )
                {

                }
            }

        } // class LoadingFace

    } // namespace LoadingFace
</string></string></string></string>

It uses the helper function retrieved_training_data.

Hope that helps.