Swift

Access a Part in a Multipart MIME Entity

Demonstrates the Chilkat Mime.PartAt method, which provides live access to the direct child at a zero-based index. The first argument is the index and the second is a Mime object that will reference the child. Modifying it modifies the child stored in the parent tree.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is how you reach into a multipart message to inspect or edit an individual part — read a part's Content-Type, extract an attachment's body, or change a part in place. The key point is that the returned Mime is a live reference, not a copy, so edits to it flow back into the parent tree. Loop from 0 to NumParts - 1 to visit every direct child.

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Swift


func chilkatTest() {
    var success: Bool = false

    let mime = CkoMime()!
    success = mime.loadFile(path: "qa_data/multipart_message.eml")
    if success == false {
        print("\(mime.lastErrorText!)")
        return
    }

    //  PartAt provides LIVE access to a direct child part.  The 1st argument is the zero-based index
    //  and the 2nd is a Mime object that will reference the child.  Modifying it modifies the child in
    //  the parent tree.
    var n: Int = mime.numParts.intValue
    print("Number of parts: \(n)")

    let part = CkoMime()!
    var i: Int
    for i = 0; i <= n - 1; i++ {
        success = mime.part(at: i, subPart: part)
        if success == false {
            print("\(mime.lastErrorText!)")
            return
        }

        print("Part \(i) Content-Type: \(part.contentType!)")
    }


}