Quoted-Printable Encode/Decode a String

Visual Basic example to quoted-printable encode and decode a string.

Download Chilkat Crypt ActiveX

Dim crypt As New ChilkatCrypt2

'  Any string argument automatically begins the 30-day trial.
Dim success As Long
success = crypt.UnlockComponent("30-day trial")
If (success <> 1) Then
    Text1.Text = Text1.Text & crypt.LastErrorText & vbCrLf
    Exit Sub
End If

'  Here's a string in Icelandic using non us-ascii chars:
Dim s As String
s = "Ég get etið gler án þess að meiða mig."

crypt.CryptAlgorithm = "none"
crypt.EncodingMode = "quoted-printable"

'  Quoted-printable encode/decode the iso-8859-1
'  representation of the string.  Notice how each
'  Icelandic char is represented by 1 byte:
crypt.Charset = "iso-8859-1"
Dim qp As String
qp = crypt.EncryptStringENC(s)
Text1.Text = Text1.Text & "iso-8859-1:" & vbCrLf
Text1.Text = Text1.Text & qp & vbCrLf
Dim decoded As String
decoded = crypt.DecryptStringENC(qp)
Text1.Text = Text1.Text & decoded & vbCrLf

'  Now do the same using utf-8. Notice how each
'  Icelandic char is represented by 2 bytes in utf-8:
crypt.Charset = "utf-8"

qp = crypt.EncryptStringENC(s)
Text1.Text = Text1.Text & "utf-8:" & vbCrLf
Text1.Text = Text1.Text & qp & vbCrLf

decoded = crypt.DecryptStringENC(qp)
Text1.Text = Text1.Text & decoded & vbCrLf