String and ASCII Code Conversion in VB 2005

We have written a customized class for various conversion between ASCII code and string that we need to use occasionally. The source code for the class can be downloaded A Visual Basic class to convert between hexadecimal, ascii, and text string on GitHub.

'Author: Yan Naing Aye
'WebSite: http://cool-emerald.blogspot.sg/
'Updated: 2009 April 24
'-----------------------------------------------------------------------------
Public Class ClsMyStr
    Public Shared Function AsAsciiEncodedStr(ByVal CharString As String) As String
        Dim outS As String = ""
        Dim temp As String = ""
        Dim i As Integer = 0
        For i = 0 To CharString.Length - 1
            temp = "00" & Hex(Asc(CharString(i)))
            temp = Right(temp, 2)
            outS = outS & temp
        Next i
        Return outS
    End Function
    Public Shared Function AsSpacedAsciiEncodedStr(ByVal CharString As String) As String
        Dim outS As String = ""
        Dim temp As String = ""
        Dim i As Integer = 0
        For i = 0 To CharString.Length - 1
            temp = "00" & Hex(Asc(CharString(i)))
            temp = Right(temp, 2)
            outS = outS & temp & " "
        Next i
        Return outS
    End Function
    Public Shared Function AsAsciiDecodedStr(ByVal AsciiEncodedStr As String) As String
        Dim outS As String = ""
        Dim i As Integer = 0
        Dim l As Integer = AsciiEncodedStr.Length - 2

        If (AsciiEncodedStr.Length Mod 2) <> 0 Then
            l -= 1
        End If
        For i = 0 To l Step 2
            outS = outS & Chr(Val("&H" & AsciiEncodedStr.Substring(i, 2)))
        Next i
        Return outS
    End Function
    Public Shared Function GetAsciiEncodedStr(ByVal RawAsciiEncodedStr As String) As String
        Dim i As Integer = 0
        Dim c As String
        Dim cmd As String = ""

        For i = 0 To RawAsciiEncodedStr.Length - 1
            c = RawAsciiEncodedStr(i)
            If (Asc(c) >= &H30) AndAlso (Asc(c) <= &H39) Then
                cmd = cmd & c
            ElseIf (Asc(c) >= &H41) AndAlso (Asc(c) <= &H5A) Then
                cmd = cmd & c
            ElseIf (Asc(c) >= &H61) AndAlso (Asc(c) <= &H7A) Then
                cmd = cmd & Chr(Asc(c) - &H20) 'change to upper case
            Else
                'MessageBox.Show("Got invalid character.")
            End If
        Next i
        If cmd.Length < 2 Then
            cmd = "0" & cmd
        End If
        Return cmd
    End Function
    Public Shared Function DoubleQuote() As String
        Return ControlChars.Quote
    End Function
    Public Shared Function Byte2Text(ByVal byteArray() As Byte) As String
        Dim str As String = BitConverter.ToString(byteArray)
        Return str
    End Function
    Public Shared Function Byte2Str(ByVal byteArray() As Byte) As String
        'Dim str As String = System.Text.Encoding.ASCII.GetString(byteArray)
        Dim str As String = ""
        For i As Integer = 0 To UBound(byteArray)
            str &= Chr(byteArray(i))
        Next
        Return str
    End Function
    Public Shared Function Str2Byte(ByVal str As String) As Byte()
        'Dim ba() As Byte = System.Text.Encoding.ASCII.GetBytes(str)
        Dim ba() As Byte
        Try
            ReDim ba(str.Length - 1)
            For i As Integer = 0 To UBound(ba)
                ba(i) = Asc(str(i))
            Next
        Catch ex As Exception
            ReDim ba(0)
            ba(0) = 0
        End Try        
        Return ba
    End Function
    Public Shared Function GetSignedDecimalText(ByVal RawStr As String) As String
        Dim i As Integer = 0
        Dim c As String
        Dim cmd As String = ""

        For i = 0 To RawStr.Length - 1
            c = RawStr(i)
            If (Asc(c) >= &H30) AndAlso (Asc(c) <= &H39) Then
                cmd = cmd & c
            ElseIf (Asc(c) = &H2D) Then
                If cmd.Length = 0 Then
                    cmd = cmd & c
                End If
            Else
                'MessageBox.Show("Got invalid character.")
            End If
        Next i        
        Return cmd
    End Function
End Class