Visual FoxPro

Connect to an FTP Server Without Logging In

Demonstrates the Chilkat Ftp2.ConnectOnly method, which establishes the connection (including any proxy and TLS setup) and receives the greeting, but does not send USER or PASS. It takes no arguments; authentication is completed with LoginAfterConnectOnly.

Background: Splitting connect from login gives you a window between the two — to read the greeting, decide which account to use, or set up TLS options that depend on the server — that the all-in-one Connect does not. After ConnectOnly the control connection is open and CheckConnection returns true even though the session is not yet authenticated.

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Visual FoxPro

LOCAL lnSuccess
LOCAL loFtp

lnSuccess = 0

*  Demonstrates the Ftp2.ConnectOnly method, which establishes the connection (including any proxy
*  and TLS setup) and receives the greeting, but does NOT send USER or PASS.  It takes no
*  arguments.  Authentication is completed separately with LoginAfterConnectOnly.

loFtp = CreateObject('Chilkat.Ftp2')

loFtp.Hostname = "ftp.example.com"
loFtp.Port = 21

*  Connect without logging in.
lnSuccess = loFtp.ConnectOnly()
IF (lnSuccess = 0) THEN
    ? loFtp.LastErrorText
    RELEASE loFtp
    CANCEL
ENDIF

? "Connected (not yet logged in)."

*  The greeting is now available; credentials can be set based on it, then authenticate.
loFtp.Username = "myFtpLogin"
loFtp.Password = "myPassword"

lnSuccess = loFtp.LoginAfterConnectOnly()
IF (lnSuccess = 0) THEN
    ? loFtp.LastErrorText
    RELEASE loFtp
    CANCEL
ENDIF

? "Logged in."

lnSuccess = loFtp.Disconnect()
IF (lnSuccess = 0) THEN
    ? loFtp.LastErrorText
    RELEASE loFtp
    CANCEL
ENDIF

RELEASE loFtp