(VB.NET UWP/WinRT) Directory Existence Check

How to test if a directory exists on an FTP server.

A good way to check to see if a directory already exists is to try to "cd" to that remote directory by calling ChangeRemoteDir. If it succeeds, then the directory exists. If not, then it does not exist. An alternative method is to set the ListPattern = "*" and then iterate over the files/directories, looking for the directory.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim ftp As New Chilkat.Ftp2

ftp.Hostname = "ftp.example.com"
ftp.Username = "login"
ftp.Password = "password"

' Connect and login to the FTP server.
Dim success As Boolean = Await ftp.ConnectAsync()
If (success <> True) Then
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If


' Does the "temp" directory exist?
Dim dirExists As Boolean
dirExists = Await ftp.ChangeRemoteDirAsync("/temp")
If (dirExists = True) Then
    Debug.WriteLine("Yes, the temp directory exists.")
    '  Yes, it exists. Restore the current remote dir:
    success = Await ftp.ChangeRemoteDirAsync("..")
    If (success <> True) Then
        Debug.WriteLine(ftp.LastErrorText)
        Exit Sub
    End If

End If


' Alternatively, you may set the ListPattern = "*" and 
'  look for the directory:
ftp.ListPattern = "*"

Dim i As Integer
Dim n As Integer
n = Await ftp.GetDirCountAsync()
If (n < 0) Then
    ' Failed to get directory listing based on ListPattern
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If

If (n > 0) Then
    For i = 0 To n - 1
        Dim isDir As Boolean
        isDir = Await ftp.GetIsDirectoryAsync(i)
        If (isDir = True) Then
            Dim fname As String
            fname = Await ftp.GetFilenameAsync(i)
            If (fname = "temp") Then
                Debug.WriteLine("Found temp directory!")
                success = Await ftp.DisconnectAsync()
                Exit Sub
            End If

        End If

    Next
End If


success = Await ftp.DisconnectAsync()