Swift

Get a Header Field of an Attachment

Demonstrates the Chilkat Email.GetAttachmentHeader method, which returns the value of a named header field of an attachment. The first argument is the zero-based attachment index and the second is the MIME header-field name. This example reads the Content-Disposition header of the first attachment.

Background: Each attachment is a MIME part with its own header block. Where GetAttachmentAttr extracts a single named parameter, GetAttachmentHeader returns the entire value of a header field — for example the full Content-Disposition: attachment; filename="notes.txt" line. That is useful for inspecting or debugging exactly how a part is described, including any custom X- headers a sender may have added.

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func chilkatTest() {
    //  Demonstrates the GetAttachmentHeader method, which returns the value of a header field
    //  (by name) of an attachment.  The first argument is the zero-based attachment index and the second is the
    //  MIME header-field name.

    let email = CkoEmail()!
    email.subject = "Attachment header field"

    email.addStringAttachment(fileName: "notes.txt", str: "Some notes.")

    //  Get the Content-Disposition header of the first attachment (index 0).
    var disp: String? = email.getAttachmentHeader(index: 0, fieldName: "Content-Disposition")
    print("Attachment 0 Content-Disposition: \(disp!)")

}