asked on 3/29/2013

c# decode string

Hello,
I have a string decoder that its partially working because some letters are decoded incorrectly.. how can I fix it?

original string
>>123456789-ABCDEFGHIJKLMNOPQRSTUVWXYZ-abcdefghijklmnopqrstuvwxyz

decoded incorrectly
123456789-¿¿¿t°©¾H¿¿¿U°©¿PQRSTUVWXYZ-abcdefghijklmnopqrstuvwxyz

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Debug.Print(Hash_Decoder("bdfhjlnprZ‚„†ˆŠŒŽ’”–˜šœž ¢¤¦¨ª¬®°²´ZÂÄÆÈÊÌÎÐÒÔÖØÚÜÞàâäæèêìîðòô"));
        }

        private string Hash_Decoder(string strUserInput)
        {       
            int intLength = 0;
            int CurX = 0;
            int lngCodes = 0;
            int EncodeNumber = 2;
            string strCodes = null;
            string FirstI = null;            
            intLength = strUserInput.Length;

            while (!(CurX == intLength))
            {
                FirstI = strUserInput.Substring(CurX, 1);
                lngCodes = (int)(FirstI)[0] / EncodeNumber;
                strCodes += (char)lngCodes;
                CurX += 1;
            }
            return strCodes;
        }

    }
}

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C#.NET Programming

Last Comment

XK8ER

3/29/2013

Ioannis Paraskevopoulos

3/29/2013

Hi,

Do you have the encoder code?

Giannis

XK8ER

3/29/2013

ASKER

yes but its vb6

Option Explicit

Const EncodeNumber = 2

Private Sub cmdEncode_Click()
    Dim intLength, CurX As Integer
    Dim lngCodes As Long
    Dim strUserInput, strCodes As String
    Dim FirstI As String
    
    intLength = Len(txtUserInput.Text)
    strUserInput = txtUserInput
    
    Do Until CurX = intLength
        CurX = CurX + 1
        FirstI = Mid$(strUserInput, CurX, CurX + 1)
        lngCodes = Asc(FirstI) * EncodeNumber
        strCodes = strCodes & Chr$(lngCodes)
        txtEnCoded.Text = strCodes
    Loop

End Sub

Private Sub cmdDecode_Click()
    Dim intLength, CurX As Integer
    Dim lngCodes As Long
    Dim strUserInput, strCodes As String
    Dim FirstI As String
    
    
    intLength = Len(txtEnCoded.Text)
    strUserInput = txtEnCoded.Text
    
    Do Until CurX = intLength
        CurX = CurX + 1
        FirstI = Mid$(strUserInput, CurX, CurX + 1)
        lngCodes = Asc(FirstI) \ EncodeNumber
        strCodes = strCodes & Chr$(lngCodes)
        txtUserInput.Text = strCodes
    Loop
End Sub

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XK8ER

3/29/2013

ASKER

I am open for suggestions if maybe encoding and decoding into HEX or DEC or something better so we dont get into trouble with comas i dont know

Ioannis Paraskevopoulos

3/29/2013

Well,
I don't have vb6 so i really don't know what is the real output of this code, though it looks fine.

What i did is putting an encoding function in the c# project:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //123456789-ABCDEFGHIJKLMNOPQRSTUVWXYZ
            Debug.Print(Hash_Encoder("123456789-ABCDEFGHIJKLMNOPQRSTUVWXYZ"));
            Debug.Print(Hash_Decoder(Hash_Encoder("123456789-ABCDEFGHIJKLMNOPQRSTUVWXYZ")));
            Debug.Print(Hash_Decoder("bdfhjlnprZ‚„†ˆŠŒŽ’”–˜šœž ¢¤¦¨ª¬®°²´"));
            //Debug.Print(Hash_Decoder("123456789-ABCDEFGHIJKLMNOPQRSTUVWXYZ"));
        }

        private string Hash_Decoder(string strUserInput)
        {
            string functionReturnValue = null;
            functionReturnValue = null;
            int intLength = 0;
            int CurX = 0;
            int lngCodes = 0;
            string strCodes = null;
            char FirstI;
            const short EncodeNumber = 2;
            intLength = strUserInput.Length;

            while (!(CurX == intLength))
            {
                FirstI = strUserInput.Substring(CurX, 1)[0];
                lngCodes = (int)FirstI / EncodeNumber;
                strCodes = strCodes + (char)lngCodes;
                functionReturnValue = strCodes;

                CurX += 1;
            }
            return functionReturnValue;
        }
        private string Hash_Encoder(string strUserInput)
        {
            string functionReturnValue = null;
            functionReturnValue = null;
            int intLength = 0;
            int CurX = 0;
            int lngCodes = 0;
            string strCodes = null;
            char FirstI;
            const short EncodeNumber = 2;
            intLength = strUserInput.Length;

            while (!(CurX == intLength))
            {
                FirstI = strUserInput.Substring(CurX, 1)[0];
                lngCodes = (int)FirstI * EncodeNumber;
                strCodes = strCodes + (char)lngCodes;
                functionReturnValue = strCodes;

                CurX += 1;
            }
            return functionReturnValue;
        }

    }
}

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This actually demonstrates, that if the input is correct, then the output is correct too.

Giannis

XK8ER

3/29/2013

ASKER

with your code implemented I still get the same input..

this is my output
123456789-¿¿¿t°©¾H¿¿¿U°©¿QRSTUVWXYZ-abcdefghijklmnopqrstuvwxyz

this is how my code looks like

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Debug.Print(Hash_Decoder("bdfhjlnprZ‚„†ˆŠŒŽ’”–˜šœž ¢¤¦¨ª¬®°²´ZÂÄÆÈÊÌÎÐÒÔÖØÚÜÞàâäæèêìîðòô"));
        }

        private string Hash_Decoder(string strUserInput)
        {
            int intLength = 0;
            int CurX = 0;
            int lngCodes = 0;            
            string strCodes = null;
            char FirstI;
            const short EncodeNumber = 2;
            intLength = strUserInput.Length;

            while (!(CurX == intLength))
            {
                FirstI = strUserInput.Substring(CurX, 1)[0];
                lngCodes = (int)FirstI / EncodeNumber;
                strCodes += (char)lngCodes;
                CurX += 1;
            }

            return strCodes;
        }

    }
}

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ASKER CERTIFIED SOLUTION

Ioannis Paraskevopoulos

3/29/2013

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XK8ER

3/29/2013

ASKER

okay.. thanks I got it