(Swift 3,4,5...) S3 Get Bucket Objects with CommonPrefixes

Demonstrates how to get a list of bucket objects using the prefix and delimiter query params to get an XML result with CommonPrefixes.

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

    let http = CkoHttp()!

    // Insert your access key here:
    http.awsAccessKey = "AWS_ACCESS_KEY"

    // Insert your secret key here:
    http.awsSecretKey = "AWS_SECRET_KEY"

    // In this example, my bucket is "chilkat100".
    // It contains a number of folders, one of which is named "images".
    // I want to get a list of all sub-folders under the "images" folder
    var strXml: String? = http.s3_ListBucketObjects("chilkat100?prefix=images/&delimiter=/")
    if http.lastMethodSuccess != true {
        print("\(http.lastErrorText!)")
        return
    }

    print("Response status code = \(http.lastStatus.intValue)")

    let xml = CkoXml()!
    var success: Bool = xml.load(strXml)
    if success != true {
        print("\(xml.lastErrorText!)")
        return
    }

    // If the response status code was not 200, then the XML response is not a 
    // listing of objects, but instead contains error information.
    if http.lastStatus.intValue != 200 {
        print("\(xml.getXml()!)")
        print("Failed.")
        return
    }

    // A sample response is shown below.
    print("\(xml.getXml()!)")
    print("----")

    // Here is the list of sub-folders (i.e. CommonPrefixes)

    // <?xml version="1.0" encoding="UTF-8"?>
    // <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    //     <Name>chilkat100</Name>
    //     <Prefix>images/</Prefix>
    //     <Marker/>
    //     <MaxKeys>1000</MaxKeys>
    //     <Delimiter>/</Delimiter>
    //     <IsTruncated>false</IsTruncated>
    //     <CommonPrefixes>
    //         <Prefix>images/africa/</Prefix>
    //     </CommonPrefixes>
    //     <CommonPrefixes>
    //         <Prefix>images/sea_creatures/</Prefix>
    //     </CommonPrefixes>
    // </ListBucketResult>

    var Prefix: String?

    // The XML can be parsed like this:
    var i: Int = 0
    var count_i: Int = xml.numChildrenHavingTag("CommonPrefixes").intValue
    while i < count_i {
        xml.i = i
        Prefix = xml.getChildContent("CommonPrefixes[i]|Prefix")
        print("Prefix = \(Prefix!)")
        i = i + 1
    }


}