Delphi DLL

Add a Custom Header to an Email Attachment

Demonstrates the Chilkat Email.AddAttachmentHeader method, which adds a custom MIME header field to an existing attachment identified by its zero-based index. This example adds an attachment (which becomes index 0), then attaches an extra header field to it and prints the resulting MIME.

Background: In MIME, every attachment is itself a mini-message with its own small block of headers — things like Content-Type, Content-Disposition, and Content-Transfer-Encoding that describe that specific part. AddAttachmentHeader lets you insert additional fields into that per-part header block, which is occasionally needed for interoperability with systems that look for custom X- headers or content identifiers on individual attachments.

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Delphi DLL

var
email: HCkEmail;

begin
//  Demonstrates the AddAttachmentHeader method, which adds a custom MIME header field to
//  an existing attachment, identified by its zero-based index.

email := CkEmail_Create();
CkEmail_putSubject(email,'Attachment with a custom header');
CkEmail_putBody(email,'The attachment has an extra MIME header.');

//  Add an attachment; it becomes attachment index 0.
CkEmail_AddStringAttachment(email,'data.txt','Attachment body.');

//  Add a custom header field to the first attachment (index 0).
CkEmail_AddAttachmentHeader(email,0,'X-Custom-Attachment-Header','some value');

//  The custom header now appears in the attachment's MIME part.
Memo1.Lines.Add(CkEmail__getMime(email));

CkEmail_Dispose(email);