(Delphi DLL) Add Header Field to MIME Sub-Header in Email

Demonstrates how to add a header field to one of the attachment sub-headers in an email.

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
email: HCkEmail;
success: Boolean;

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

email := CkEmail_Create();

CkEmail_putSubject(email,'test');
CkEmail_AddTo(email,'Chilkat','support@chilkatsoft.com');
CkEmail_putFrom(email,'Matt <matt@example.com>');
CkEmail_putBody(email,'This is a simple plain-text body.');

success := CkEmail_AddFileAttachment2(email,'qa_data/1.HPM','application/x-hprimnet');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkEmail__lastErrorText(email));
    Exit;
  end;

// Add a "ContentDescription: HPM/3.0" in the attachment's sub-header.
// The 1st attachment is at index 0.
CkEmail_AddAttachmentHeader(email,0,'Content-Description','HPM/3.0');

// Show the email MIME:
Memo1.Lines.Add(CkEmail__getMime(email));

// This is the output:
// (Note: When Chilkat sends email, all CKX-* headers are removed prior to sending.)

// MIME-Version: 1.0
// Date: Wed, 16 Jan 2019 10:05:18 -0600
// Message-ID: <93B88835586270B7BE5202F84E171F29C10BA935@CHILKATSLICE>
// Content-Type: multipart/mixed; boundary="------------000502000000020502010608"
// X-Priority: 3 (Normal)
// Subject: test
// To: Chilkat <support@chilkatsoft.com>
// From: Matt <matt@example.com>
// CKX-Bounce-Address: matt@example.com
// 
// --------------000502000000020502010608
// Content-Type: text/plain; charset=us-ascii; format=flowed
// Content-Transfer-Encoding: 7bit
// 
// This is a simple plain-text body.
// --------------000502000000020502010608
// Content-Type: application/x-hprimnet; name="1.HPM"
// Content-Transfer-Encoding: base64
// Content-Disposition: attachment; filename="1.HPM"
// Content-Description: HPM/3.0
// 
// FILE_DATA_IS_HERE...
// 
// --------------000502000000020502010608--

CkEmail_Dispose(email);

end;