(Swift 3,4,5...) Extract Files from Binary SOAP MTOM MIME

This example demonstrates how to extract files from a binary SOAP MTOM MIME document.

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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let mime = CkoMime()!

    // In this example, we have a MIME file containing 8bit (non-encoded) binary data,
    // and it is what I call "headless".  MIME is headless when it omits
    // the top-level header.  The file we have here begins with the first
    // boundary string.

    // The structure the MIME to be loaded is:

    // multipart/mixed (inferred because it is headless)
    //     application/xop+xml
    //     image/jpeg
    //     image/gif
    //     image/gif
    // 

    var success: Bool = mime.loadFile("qa_data/mime/headless_binary_soap_mtom_mime.mim")
    if success != true {
        print("\(mime.lastErrorText!)")
        return
    }

    // The MIME file loaded in this example contains this:

    // --uuid:e74486f4-52b0-44b6-b829-156810fae20d
    // Content-Type: application/xop+xml; charset=UTF-8; type="application/soap+xml"
    // Content-Transfer-Encoding: binary
    // Content-ID: <root.message@cxf.apache.org>
    // 
    // <soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Body> ... </soap:Body></soap:Envelope>
    // --uuid:e74486f4-52b0-44b6-b829-156810fae20d
    // Content-Type: image/jpeg
    // Content-Transfer-Encoding: binary
    // Content-ID: <beee83b7-166c-494c-890a-def990e9887b-1496@cxf.apache.org>
    // Content-Disposition: attachment;name="-2049913191"
    // 
    // BINARY DATA HERE...
    // 
    // --uuid:e74486f4-52b0-44b6-b829-156810fae20d
    // Content-Type: image/gif
    // Content-Transfer-Encoding: binary
    // Content-ID: <beee83b7-166c-494c-890a-def990e9887b-1497@cxf.apache.org>
    // Content-Disposition: attachment;name="-2049913188"
    // 
    // BINARY DATA HERE...
    // 
    // --uuid:e74486f4-52b0-44b6-b829-156810fae20d
    // Content-Type: image/gif
    // Content-Transfer-Encoding: binary
    // Content-ID: <beee83b7-166c-494c-890a-def990e9887b-1498@cxf.apache.org>
    // Content-Disposition: attachment;name="-2049913185"
    // 
    // BINARY DATA HERE...
    // 
    // --uuid:e74486f4-52b0-44b6-b829-156810fae20d--

    // Get the number of MIME sub-parts.
    var numParts: Int = mime.numParts.intValue

    // The 1st part at index 0 is the application/xop+xml.  We're just going to extract the JPG and GIF image files..
    let sbFilename = CkoStringBuilder()!
    var name: String?
    var i: Int = 1
    while i < numParts {
        var mp: CkoMime? = mime.getPart(i)

        // By looking at the MIME above, the "name" attribute of the Content-Disposition header field seems
        // to be the only possible name we can use for each image..
        sbFilename.append("qa_output/")
        name = mp!.getHeaderFieldAttribute("Content-Disposition", attrName: "name")
        sbFilename.append(name)
        sbFilename.append(".")
        sbFilename.append(mp!.contentType)
        var numReplaced: Int = sbFilename.replace("image/", replacement: "").intValue
        mp!.saveBody(sbFilename.getAsString())
        print("output file: \(sbFilename.getAsString()!)")

        mp = nil
        sbFilename.clear()
        i = i + 1
    }

    print("Success.")

}