Swift

Enable FTP MODE Z Compression

Demonstrates the Chilkat Ftp2.SetModeZ method, which enables MODE Z compression for subsequent data connections. It takes no arguments. Call it after connecting and only when the HasModeZ property is true.

Background: MODE Z compresses data on the fly (using zlib) as it crosses the wire, which can meaningfully speed up transfers of compressible content — text, HTML, logs — over a slow link. It is a server extension, so check HasModeZ first and expect it to be unavailable on many servers. There is little benefit for already-compressed data such as images or archives, where the CPU cost of compression buys almost nothing.

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Swift


func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the Ftp2.SetModeZ method, which enables MODE Z compression for subsequent data
    //  connections.  It takes no arguments.  Call it after connecting, and only when the HasModeZ
    //  property indicates the server supports it.

    let ftp = CkoFtp2()!

    ftp.hostname = "ftp.example.com"
    ftp.username = "myFtpLogin"

    //  Normally you would not hard-code the password in source.  You should instead obtain it
    //  from an interactive prompt, environment variable, or a secrets vault.
    ftp.password = "myPassword"

    success = ftp.connect()
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }

    success = ftp.changeRemoteDir(relativeDirPath: "public_html")
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }

    //  Only enable compression if the server advertises MODE Z support.
    if ftp.hasModeZ {
        success = ftp.setModeZ()
        if success == false {
            print("\(ftp.lastErrorText!)")
            return
        }

        print("MODE Z compression enabled.")
    }
    else {
        print("The server does not support MODE Z.")
    }

    //  Subsequent uploads, downloads, and listings are transferred compressed.

    success = ftp.disconnect()
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }


}