Swift

Monitor FTP Transfer Progress

Demonstrates the progress properties CurBytesReceived, CurBytesReceivedStr, CurBytesSent, CurBytesSentStr, ProgressMonSize, PercentDoneScale, and AutoGetSizeForProgress.

Note: The local paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Percentage progress needs a known total, but FTP does not always report a file's size up front — so AutoGetSizeForProgress issues a SIZE command before a download, and ProgressMonSize supplies an expected size when even that is unavailable (a one-shot value consumed by the next transfer). PercentDoneScale sets the resolution of progress callbacks. The current byte counts are exposed both as 32-bit integers and as strings, the string forms avoiding integer-width limits for very large transfers.

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Swift


func chilkatTest() {
    var success: Bool = false

    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
    }

    //  AutoGetSizeForProgress sends a SIZE command before a download so percentage-based progress can
    //  be computed.
    ftp.autoGetSizeForProgress = true

    //  PercentDoneScale sets the value representing one hundred percent in PercentDone callbacks.
    //  1000 gives tenth-of-a-percent resolution.
    ftp.percentDoneScale = 1000

    //  ProgressMonSize is a one-shot expected size for the next download when the size is not
    //  otherwise known.  It is consumed by the next download and reset to 0.
    ftp.progressMonSize = 20485760

    success = ftp.getFile(remoteFilename: "public_html/bigfile.zip", localPath: "qa_output/bigfile.zip")
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }

    //  After a transfer, the current byte counts are available as 32-bit numbers or as strings (the
    //  string forms avoid integer-size limits).
    print("Bytes received: \(ftp.curBytesReceived)")
    print("Bytes received (str): \(ftp.curBytesReceivedStr!)")
    print("Bytes sent: \(ftp.curBytesSent)")
    print("Bytes sent (str): \(ftp.curBytesSentStr!)")

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


}