VBScript

Capture the FTP Session Log

Demonstrates the SessionLog property (with KeepSessionLog), which holds the in-memory FTP protocol conversation — commands and server replies — collected during the session.

Background: When an FTP operation fails for a non-obvious reason, the exact command/reply exchange is the most useful diagnostic there is, and SessionLog captures it verbatim once KeepSessionLog is enabled. Passwords are omitted, so it is safe to log or attach to a bug report. Over a long session it grows without bound; clear it with ClearSessionLog to bound memory or to isolate the log for one operation.

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VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

set ftp = CreateObject("Chilkat.Ftp2")

ftp.Hostname = "ftp.example.com"
ftp.Username = "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.Password = "myPassword"

'  Keep an in-memory log of the FTP protocol conversation for troubleshooting.  Passwords are
'  not recorded in it.
ftp.KeepSessionLog = 1

success = ftp.Connect()
If (success = 0) Then
    outFile.WriteLine(ftp.LastErrorText)
    WScript.Quit
End If

success = ftp.ChangeRemoteDir("public_html")
If (success = 0) Then
    outFile.WriteLine(ftp.LastErrorText)
    WScript.Quit
End If

'  The SessionLog contains the protocol commands and server replies collected so far.
outFile.WriteLine(ftp.SessionLog)

success = ftp.Disconnect()
If (success = 0) Then
    outFile.WriteLine(ftp.LastErrorText)
    WScript.Quit
End If


outFile.Close