(Delphi ActiveX) Setting the MIME Text Charset (such as utf-8, iso-8859-1, etc.)

Demonstrates how setting the Charset property controls the character encoding used for the text body in a MIME message.

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
mime: TChilkatMime;

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

mime := TChilkatMime.Create(Self);

// Set the MIME body using some 8bit non-us-ascii characters:
mime.SetBody('á, é, í, ó, ú');

// Set the Content-Type
mime.ContentType := 'text/plain';

// Set the Content-Transfer-Encoding to "quoted-printable"
// so it's easy to see the bytes used to encode each character
// (i.e. it will be easy to see that utf-8 uses 2-bytes for 
// non-us-ascii characters such as "á", whereas a character
// encoding such as iso-8859-1 will use one byte per character.
mime.Encoding := 'quoted-printable';

// Set the Charset to utf-8
mime.Charset := 'utf-8';

// Examine the MIME:
Memo1.Lines.Add(mime.GetMime());

// The MIME should look like this:

// Content-Transfer-Encoding: quoted-printable
// Content-Type: text/plain; charset="utf-8"
// 
// =C3=A1, =C3=A9, =C3=AD, =C3=B3, =C3=BA

// Now change the Charset to "iso-8859-1"
mime.Charset := 'iso-8859-1';

// Get the MIME again...
Memo1.Lines.Add(mime.GetMime());

// Now the MIME should look like this:

// Content-Transfer-Encoding: quoted-printable
// Content-Type: text/plain; charset="iso-8859-1"
// 
// =E1, =E9, =ED, =F3, =FA
end;