(Swift 3,4,5...) Fetch ISBN XML from isbndb.com and Parse

Demonstrates sending a query to isbndb.com and parsing the XML response.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

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

    let http = CkoHttp()!

    // The access_key in this URL is a valid access key, but limited to 100 queries per day.
    // If the key does not work, it may be that others were testing and exhausted the limit.
    var strXml: String? = http.quickGetStr("http://isbndb.com/api/books.xml?access_key=OV8L2Y9I&results=details&index1=isbn&value1=0443074348")
    if http.lastMethodSuccess != true {
        print("\(http.lastErrorText!)")
        return
    }

    let xml = CkoXml()!
    var success: Bool = xml.load(strXml)

    // The XML returned for this URL is the following:

    // <?xml version="1.0" encoding="UTF-8" ?>

    // <ISBNdb server_time="2007-10-25T14:07:25Z">
    //     <BookList total_results="1" page_size="10" page_number="1" shown_results="1">
    //         <BookData book_id="diagnostic_histopathology_of_tumors_2_volume_set_with_cd_rom" isbn="0443074348">
    //             <Title>Diagnostic Histopathology of Tumors: 2-Volume Set with CD-ROMs</Title>
    //             <TitleLong>Diagnostic Histopathology of Tumors: 2-Volume Set with CD-ROMs (Diagnostic Histopathology of Tumors (Fletcher))</TitleLong>
    //             <AuthorsText>Christopher D. M. Fletcher (Editor)</AuthorsText>
    //             <PublisherText publisher_id="churchill_livingstone">Churchill Livingstone</PublisherText>
    //             <Details dewey_decimal="616" physical_description_text="2166 pages" language="" edition_info="Hardcover; 2007-03-13" dewey_decimal_normalized="616" lcc_number="" change_time="2006-12-13T14:53:42Z" price_time="2007-10-25T01:12:13Z" />
    //         </BookData>
    //     </BookList>
    // </ISBNdb>

    // First, navigate to the BookData node:
    success = xml.firstChild2()
    success = xml.firstChild2()

    // Show the Title and AuthorsText:
    print("\(xml.getChildContent("Title")!)")
    print("\(xml.getChildContent("AuthorsText")!)")

    // Show the publisher_id attribute of the PublisherText node:
    var xml2: CkoXml?
    xml2 = xml.findChild("PublisherText")
    print("\(xml2!.getAttrValue("publisher_id")!)")

    xml2 = nil

    // Save the XML to a file:
    success = xml.save("book.xml")

}