Lianja

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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llSuccess = .F.

loFtp = createobject("CkFtp2")

loFtp.Hostname = "ftp.example.com"
loFtp.Username = "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.
loFtp.SoRcvBuf = 4194304
loFtp.SoSndBuf = 524288

//  PreferIpv6 (default .F.) chooses IPv6 over IPv4 when a hostname resolves to both.
loFtp.PreferIpv6 = .F.

//  ClientIpAddress is normally left unset; set it on a multihomed host to bind the outgoing
//  connection to a specific local interface.
loFtp.ClientIpAddress = "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.
loFtp.Password = "myPassword"

llSuccess = loFtp.Connect()
if (llSuccess = .F.) then
    ? loFtp.LastErrorText
    release loFtp
    return
endif

? "Connected with custom socket options."

llSuccess = loFtp.Disconnect()
if (llSuccess = .F.) then
    ? loFtp.LastErrorText
    release loFtp
    return
endif



release loFtp