Quoted-Printable Encode/Decode a String

Delphi example to quoted-printable encode and decode a string.

Download Chilkat Crypt ActiveX

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATCRYPT2Lib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
crypt: TChilkatCrypt2;
success: Integer;
s: String;
qp: String;
decoded: String;

begin
crypt := TChilkatCrypt2.Create(Self);

//  Any string argument automatically begins the 30-day trial.
success := crypt.UnlockComponent('30-day trial');
if (success <> 1) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);
    Exit;
  end;

//  Here's a string in Icelandic using non us-ascii chars:
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';
qp := crypt.EncryptStringENC(s);
Memo1.Lines.Add('iso-8859-1:');
Memo1.Lines.Add(qp);
decoded := crypt.DecryptStringENC(qp);
Memo1.Lines.Add(decoded);

//  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);
Memo1.Lines.Add('utf-8:');
Memo1.Lines.Add(qp);
decoded := crypt.DecryptStringENC(qp);
Memo1.Lines.Add(decoded);
end;