VB.NET

Log In After ConnectOnly on an FTP Server

Demonstrates the Chilkat Ftp2.LoginAfterConnectOnly method, which authenticates a control connection previously established by ConnectOnly. It takes no arguments, sends USER, PASS, and ACCT when required, then performs normal post-login initialization.

Background: This is the second half of the two-step connect. Beyond sending the credentials, it runs the same post-login setup Connect would — for example issuing TYPE I and any auto-negotiated features — so the session ends up in the same ready state either way. The value of the split is entirely in what you can do in the gap between the two calls.

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Dim success As Boolean = False

'  Demonstrates the Ftp2.LoginAfterConnectOnly method, which authenticates a control connection
'  previously established by ConnectOnly.  It takes no arguments and sends USER, PASS, and (when
'  required) ACCT, then performs normal post-login initialization.

Dim ftp As New Chilkat.Ftp2

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

'  First connect without logging in.
success = ftp.ConnectOnly()
If (success = False) Then
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If


'  Set credentials (for example, after inspecting the greeting), then log in.
ftp.Username = "myFtpLogin"
ftp.Password = "myPassword"

success = ftp.LoginAfterConnectOnly()
If (success = False) Then
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If

Debug.WriteLine("Logged in.")

success = ftp.Disconnect()
If (success = False) Then
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If