VB.NET

Get an FTP Listing Entry's Size (32-bit)

Demonstrates the Chilkat Ftp2.GetSize method, which returns the size in bytes of a cached directory-listing entry as a 32-bit integer. The only argument is a zero-based index. It returns -1 when the index is invalid or the size is unavailable.

Background: The size comes from the cached listing, so reading it for every entry costs no extra round trips. A 32-bit result cannot represent files past about 2 GB, so use GetSize64 (or GetSizeStr) when large files are possible. Directories often report no meaningful size and come back as -1, which is why the -1 case is worth handling rather than printing blindly.

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Dim success As Boolean = False

'  Demonstrates the Ftp2.GetSize method, which returns the size in bytes of a cached
'  directory-listing entry as a 32-bit integer.  The only argument is a zero-based index.

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


'  GetDirCount retrieves the directory listing on the first call and returns the number of
'  entries.  A negative return indicates failure.
Dim n As Integer = ftp.GetDirCount()
If (n < 0) Then
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If


Dim i As Integer
For i = 0 To n - 1
    Dim name As String = ftp.GetFilename(i)

    '  GetSize returns -1 when the index is invalid or the size is unavailable (for example for a
    '  directory).  Use GetSize64 for files that may exceed 2 GB.
    Dim fileSize As Integer = ftp.GetSize(i)
    Debug.WriteLine(name & "  " & fileSize & " bytes")
Next

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