FTP Socket Buffer and Address Options

Demonstrates the SoRcvBuf, SoSndBuf, PreferIpv6, and ClientIpAddress properties.

Background: These are low-level knobs for specific situations. Larger send/receive buffers can improve throughput on high-bandwidth, high-latency links, though the defaults suit the common case. PreferIpv6 only matters when a hostname resolves to both address families, choosing which to try first. ClientIpAddress is normally left unset; set it on a multihomed host to bind the outgoing connection to a particular local interface. Change any of these only with a concrete reason.

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    success := false

    ftp := chilkat.NewFtp2()

    ftp.SetHostname("ftp.example.com")
    ftp.SetUsername("myFtpLogin")

    //  SoRcvBuf and SoSndBuf set the TCP socket receive/send buffer sizes.  The defaults are tuned for
    //  the common case; larger values can sometimes help throughput on high-latency links.
    ftp.SetSoRcvBuf(4194304)
    ftp.SetSoSndBuf(524288)

    //  PreferIpv6 (default false) chooses IPv6 over IPv4 when a hostname resolves to both.
    ftp.SetPreferIpv6(false)

    //  ClientIpAddress is normally left unset; set it on a multihomed host to bind the outgoing
    //  connection to a specific local interface.
    ftp.SetClientIpAddress("192.168.1.50")

    //  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
    }

    fmt.Println("Connected with custom socket options.")

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


    ftp.DisposeFtp2()