DataFlex

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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DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoEmail
    Boolean iSuccess
    String sTemp1

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

    Get Create (RefClass(cComChilkatEmail)) To hoEmail
    If (Not(IsComObjectCreated(hoEmail))) Begin
        Send CreateComObject of hoEmail
    End
    Set ComSubject Of hoEmail To "Attachment with a custom header"
    Set ComBody Of hoEmail To "The attachment has an extra MIME header."

    //  Add an attachment; it becomes attachment index 0.
    Get ComAddStringAttachment Of hoEmail "data.txt" "Attachment body." To iSuccess

    //  Add a custom header field to the first attachment (index 0).
    Send ComAddAttachmentHeader To hoEmail 0 "X-Custom-Attachment-Header" "some value"

    //  The custom header now appears in the attachment's MIME part.
    Get ComGetMime Of hoEmail To sTemp1
    Showln sTemp1


End_Procedure