MIME Multipart Boundary and Preamble Properties

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Demonstrates the Boundary property, which gets or sets the raw boundary token of a multipart entity (without surrounding quotation marks), and UseMmDescription, which controls whether the conventional preamble text is emitted when serializing a multipart entity.

func chilkatTest() {
    var success: Bool = false

    let mime = CkoMime()!

    //  Create a multipart/mixed entity.
    success = mime.newMultipartMixed()
    if success == false {
        print("\(mime.lastErrorText!)")
        return
    }

    //  Boundary is the raw boundary token, without surrounding quotation marks.  Chilkat quotes it
    //  automatically in the serialized header when required.
    mime.boundary = "example-boundary"

    //  UseMmDescription controls whether the conventional preamble text
    //  "This is a multi-part message in MIME format." is emitted.  The default is false.
    mime.useMmDescription = true

    //  Add a simple part so the multipart has content.
    let part = CkoMime()!
    success = part.setBody(fromPlainText: "First part.")
    if success == false {
        print("\(part.lastErrorText!)")
        return
    }

    success = mime.appendPart(mime: part)
    if success == false {
        print("\(mime.lastErrorText!)")
        return
    }

    print("Boundary = \(mime.boundary!)")

    var mimeStr: String? = mime.getMime()
    if mime.lastMethodSuccess == false {
        print("\(mime.lastErrorText!)")
        return
    }

    print("\(mimeStr!)")

}