File Existence Check

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Testing to see if a file exists on the FTP server. The GetSizeByName method is a convenient way to check if a file exists. It will return -1 if the file does not exist, otherwise it returns the size of the file in bytes.

Dim ftp As New ChilkatFtp2

Dim success As Long

'  Any string unlocks the component for the 1st 30-days.
success = ftp.UnlockComponent("Anything for 30-day trial")
If (success <> 1) Then
    MsgBox ftp.LastErrorText
    Exit Sub
End If

ftp.Hostname = "ftp.***.com"
ftp.Username = "***"
ftp.Password = "***"

'  Connect and login to the FTP server.
success = ftp.Connect()
If (success <> 1) Then
    MsgBox ftp.LastErrorText
    Exit Sub
End If

'  Set the current remote directory to where the file is located:
success = ftp.ChangeRemoteDir("/something")
If (success <> 1) Then
    MsgBox ftp.LastErrorText
    Exit Sub
End If

'  Test to see if the file exists by getting the file size by name.
'  If a -1 is returned, the file does not exist.
Dim fileSize As Long
fileSize = ftp.GetSizeByName("test123.txt")
If (fileSize < 0) Then
    Text1.Text = Text1.Text & "file does not exist" & vbCrLf
Else
    Text1.Text = Text1.Text & "file exists and is " _
         & fileSize & " bytes in size" & vbCrLf
End If

ftp.Disconnect