(Swift 3,4,5...) Extract and Save PDF from SOAP XML

Demonstrates how to extract and save PDF file that is embedded in SOAP XML (or any XML).

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func chilkatTest() {
    let xml = CkoXml()!

    var success: Bool = xml.loadFile("qa_data/soap/soapWithPdf.xml")
    if success != true {
        print("\(xml.lastErrorText!)")
        return
    }

    // The XML we loaded looks like this:

    // <?xml version="1.0" encoding="utf-8" ?>
    // <s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
    //     <s:Body>
    //         <ObtenerPDFResponse xmlns="http://xyz.org/">
    //             <ObtenerPDFResult xmlns:a="http://schemas.xyz.org/something" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
    //                 <a:CBB i:nil="true" />
    //                 <a:CodigoConfirmacion i:nil="true" />
    //                 <a:ErrorDetallado />
    //                 <a:ErrorGeneral i:nil="true" />
    //                 <a:FechaGenerada i:nil="true" />
    //                 <a:FolioGenerado i:nil="true" />
    //                 <a:OperacionExitosa>true</a:OperacionExitosa>
    //                 <a:PDF>JVBERi0xLjQKJe...</a:PDF>
    //                 <a:XML i:nil="true" />
    //             </ObtenerPDFResult>
    //         </ObtenerPDFResponse>
    //     </s:Body>
    // </s:Envelope>

    var pdfElement: CkoXml? = xml.findChild("s:Body|ObtenerPDFResponse|ObtenerPDFResult|a:PDF")
    if xml.lastMethodSuccess != true {
        print("Did not find the PDF element at the expected location.")
        return
    }

    success = pdfElement!.saveBinaryContent("qa_output/out.pdf", unzipFlag: false, decryptFlag: false, password: "")
    if success != true {
        print("\(xml.lastErrorText!)")
        return
    }

    print("Successfully extracted and saved the PDF.")

}