Create a Multipart-Mixed MIME Message

Creates a multipart-mixed MIME message with the 1st part containing plain-text, and the 2nd part containing a GIF image.

Download Chilkat MIME ActiveX

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
mime: CHILKATMIMELib_TLB.IChilkatMime;
success: Integer;
textPart: CHILKATMIMELib_TLB.IChilkatMime;
imagePart: CHILKATMIMELib_TLB.IChilkatMime;

begin
mime := CoChilkatMime.Create();

success := mime.UnlockComponent('Anything for 30-day trial.');
if (success = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;

//  Initialize a multipart-mixed MIME message:
mime.NewMultipartMixed();

//  Each sub-part will be prepared, then added to the
//  top-level multipart/mixed MIME object, and then written
//  to a file.

//  First the plain-text sub-part
//  Add a few header fields:
textPart := CoChilkatMime.Create();
textPart.AddHeaderField('Description','this is a test');
textPart.AddHeaderField('MyId','123');
textPart.SetBodyFromPlainText('This is the plain-text body');

//  Now for a GIF image:
imagePart := CoChilkatMime.Create();
success := imagePart.SetBodyFromFile('starfish.gif');
if (success = 0) then
  begin
    Memo1.Lines.Add(imagePart.LastErrorText);
    Exit;
  end;

//  Append each sub-part to the top-level MIME object:
mime.AppendPart(textPart);
mime.AppendPart(imagePart);

//  Write the full multipart-mixed MIME to a file.
success := mime.SaveMime('out.mim');
if (success = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add(mime.GetMime());

//  The MIME should look something like this:
//  (See more comments following this sample output...)

//  
Content-Type: multipart/mixed;
 boundary="------------080503030004040303020208"

This is a multi-part message in MIME format.

--------------080503030004040303020208
Description: this is a test
MyId: 123
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

This is the plain-text body
--------------080503030004040303020208
Content-Disposition: attachment; filename="starfish.gif"
Content-Transfer-Encoding: base64
Content-Type: image/gif; name="starfish.gif"

R0lGODlhIAAgAPcAAP///+/v7/f39+/n5/fv7//39/fn597OzufW1tbGxs69vffe3u/W1salpZQQ
EIQYEJwQCJQYCJwYCM6clL2Ee5wpGIwhEK0YANatpdalnHMYCKUhCJQYAKUYAM6Ec5QhCJwhCPfW
zu/Oxta1rb17a6UhAK0hAPe9rb2Ec7V7a71rUpwpCL0xCJwhAOfOxta9tcatpdallM6cjMaUhK1C
IZwxELU5EK0xCLUxCN61pcacjK1rUrVaOaVKKZxCIZwxCKUxCL05CLUxAM6llO+1nMZzUr1rSrVS
KaVCGK1CGLVCEJQxCK05CLU5CIwpAKUxAK0xAM69tffWxrVrSrVaMbVKGMZKEL1CCLU5AP/v597O
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kMAQKljotJJGDZklS9PkyEHGLZu1ctbCmWvXThurfAbvHSii5kegxpYqtRpEKFnid/TSneu2LRYh
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ugSTCRA/ILFDCjTckUkrpYiCAEluYCMLJCsoMQUM9gjQRSSL7CLJJjmQxMw3kQChxA78IFULHIK0
MgonXyR5UAHWVBKIEmEcUJAIYxgSSSF94AZRPrgsQgUF0RmUgWpy/LFmRYdMkACAANwrWA8cbAhi
RZ8cjRWro0QEEsQVGTiKkLAM5QNGFWrAQFNLBIzABQPLRktQQAA7

--------------080503030004040303020208--

//  To explicitly set the boundary, set the Boundary property, like this:
mime.Boundary := 'SOME_UNIQUE_BOUNDARY_STRING';

//  To eliminate the "This is a multi-part message in MIME format."
//  from the output, set the UseMmDescription property = 0
mime.UseMmDescription := 0;

Memo1.Lines.Add(mime.GetMime());

//  The MIME now looks like this:
//  
Content-Type: multipart/mixed;
 boundary="SOME_UNIQUE_BOUNDARY_STRING"

--SOME_UNIQUE_BOUNDARY_STRING
Description: this is a test
MyId: 123
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

This is the plain-text body
--SOME_UNIQUE_BOUNDARY_STRING
Content-Disposition: attachment; filename="starfish.gif"
Content-Transfer-Encoding: base64
Content-Type: image/gif; name="starfish.gif"

R0lGODlhIAAgAPcAAP///+/v7/f39+/n5/fv7//39/fn597OzufW1tbGxs69vffe3u/W1salpZQQ
EIQYEJwQCJQYCJwYCM6clL2Ee5wpGIwhEK0YANatpdalnHMYCKUhCJQYAKUYAM6Ec5QhCJwhCPfW
zu/Oxta1rb17a6UhAK0hAPe9rb2Ec7V7a71rUpwpCL0xCJwhAOfOxta9tcatpdallM6cjMaUhK1C
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KaVCGK1CGLVCEJQxCK05CLU5CIwpAKUxAK0xAM69tffWxrVrSrVaMbVKGMZKEL1CCLU5AP/v597O
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--SOME_UNIQUE_BOUNDARY_STRING--

end;