(Delphi ActiveX) MIME Header Q and B Encoding and Decoding

Demonstrates how to Q and B encode/decode.

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
sb: TChilkatStringBuilder;
success: Integer;
sb2: TChilkatStringBuilder;

begin
sb := TChilkatStringBuilder.Create(Self);

sb.Append('This is a test');

Memo1.Lines.Add(sb.GetEncoded('B','utf-8'));
// output is:
// =?utf-8?B?VGhpcyBpcyBhIHRlc3Q=?=

Memo1.Lines.Add(sb.GetEncoded('Q','iso-8859-1'));
// output is:
// =?utf-8?Q?This_is_a_test?=

sb2 := TChilkatStringBuilder.Create(Self);

sb2.Append('=?utf-8?B?VGhpcyBpcyBhIHRlc3Q=?=');
sb2.Decode('B','utf-8');
Memo1.Lines.Add(sb2.GetAsString());

// output is:
// This is a test

sb2.Clear();
sb2.Append('=?utf-8?Q?This_is_a_test?=');
sb2.Decode('Q','utf-8');
Memo1.Lines.Add(sb2.GetAsString());

// output is:
// This is a test

// "B" or "Q" will decode both B and Q.
sb2.Clear();
sb2.Append('=?utf-8?Q?This_is_a_test?= 123 =?utf-8?B?VGhpcyBpcyBhIHRlc3Q=?=');
sb2.Decode('Q','utf-8');
Memo1.Lines.Add(sb2.GetAsString());

// output is:
// This is a test 123 This is a test
end;