VB.NET

Get a Remote FTP File's Size by Name

Demonstrates the Chilkat Ftp2.GetSizeByName method, which returns the size in bytes of a named file in the current remote directory as a 32-bit integer. The only argument is the filename — a name, not a path. It returns -1 when the file is not found or the size cannot be obtained.

Background: This is the direct way to get one file's size when you already know its name, typically via a SIZE command — no full directory listing required. Because the result is 32-bit, it cannot represent files past about 2 GB; use GetSizeStrByName for large files. The argument must be a bare filename in the current directory, so ChangeRemoteDir to the right place first.

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Dim success As Boolean = False

'  Demonstrates the Ftp2.GetSizeByName method, which returns the size in bytes of a named file in
'  the current remote directory as a 32-bit integer.  The only argument is the filename (a name,
'  not a path).

Dim ftp As New 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"

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


success = ftp.ChangeRemoteDir("public_html")
If (success = False) Then
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If


'  Returns -1 when the file is not found or the size cannot be obtained.  For files that may
'  exceed 2 GB, use GetSizeStrByName (returns a decimal string).
Dim fileSize As Integer = ftp.GetSizeByName("report.pdf")
If (fileSize < 0) Then
    Debug.WriteLine("File not found, or size unavailable.")
    Exit Sub
End If

Debug.WriteLine("report.pdf is " & fileSize & " bytes")

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