Pascal (Lazarus/Delphi)

MIME Header Q and B Encoding and Decoding

See more Encryption Examples

Demonstrates how to Q and B encode/decode. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.StringBuilder;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  sb: TStringBuilder;
  sb2: TStringBuilder;

begin
  success := False;

  sb := TStringBuilder.Create;

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

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

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

  sb2 := TStringBuilder.Create;

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

  //  output is:
  //  This is a test

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

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


  sb.Free;
  sb2.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.