Swift

Get a Header Attribute of an Attachment

Demonstrates the Chilkat Email.GetAttachmentAttr method, which returns a header-field attribute value from a header field of the Nth attachment. The first argument is the zero-based attachment index, the second names a header field, and the third names an attribute within it. This example reads the filename attribute of the attachment's Content-Disposition header.

Background: A MIME header can have named parameters after its main value, such as Content-Type: text/plain; charset="utf-8"; name="notes.txt". Here charset and name are attributes. GetAttachmentAttr pulls out one named attribute from a chosen header of a specific attachment, sparing you from parsing the raw header string and dealing with quoting or ordering.

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func chilkatTest() {
    //  Demonstrates the GetAttachmentAttr method, which returns a header-field attribute value
    //  from a header field of the Nth attachment.  The first argument is the zero-based attachment
    //  index, the second is the header field name, and the third is the attribute name.

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

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

    //  Get the "filename" attribute of the attachment's Content-Disposition header (index 0).
    var fname: String? = email.getAttachmentAttr(index: 0, fieldName: "Content-Disposition", attrName: "filename")
    print("Attachment filename attribute: \(fname!)")

}