(Delphi ActiveX) Quoted-Printable Encode/Decode a String

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

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

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

begin
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

crypt := TChilkatCrypt2.Create(Self);

// 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;