Swift

Download an FTP File to a Stream

Demonstrates the Chilkat Ftp2.GetFileToStream method, which downloads a remote file and writes its bytes to a Stream. The first argument is the remote file path and the second is the Stream, which must have a destination sink configured beforehand.

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: Streaming to a Stream object decouples the download from where the bytes ultimately go — a file (as here, via SinkFile), or a pipe feeding another component such as a decompressor or a hashing routine — and processes the data as it arrives rather than buffering the whole file. That keeps memory flat for large downloads and lets you chain the transfer into a processing pipeline.

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Swift


func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the Ftp2.GetFileToStream method, which downloads a remote file and writes its
    //  bytes to a Stream.  The 1st argument is the remote file path and the 2nd is the Stream.

    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
    }

    //  Configure the stream's destination sink before downloading.  Here the stream writes to a
    //  local file.
    let fileStream = CkoStream()!
    fileStream.sinkFile = "qa_output/report.pdf"

    success = ftp.getFile(toStream: "public_html/report.pdf", to: fileStream)
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }

    print("Downloaded to stream.")

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


}