Download an FTP File to a Stream

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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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    success := 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.

    ftp := chilkat.NewFtp2()

    ftp.SetHostname("ftp.example.com")
    ftp.SetUsername("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.SetPassword("myPassword")

    success = ftp.Connect()
    if success == false {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        return
    }

    //  Configure the stream's destination sink before downloading.  Here the stream writes to a
    //  local file.
    fileStream := chilkat.NewStream()
    fileStream.SetSinkFile("qa_output/report.pdf")

    success = ftp.GetFileToStream("public_html/report.pdf",fileStream)
    if success == false {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        fileStream.DisposeStream()
        return
    }

    fmt.Println("Downloaded to stream.")

    success = ftp.Disconnect()
    if success == false {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        fileStream.DisposeStream()
        return
    }


    ftp.DisposeFtp2()
    fileStream.DisposeStream()