(VB.NET) FTP Iterate over Files in Directory Matching ListPattern

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Uses the ListPattern property to iterate over the files in a directory matching the pattern.

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' 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 = "my_login"
ftp.Password = "my_password"
ftp.Port = 21
ftp.AuthTls = True

Dim success As Boolean = ftp.Connect()
If (success <> True) Then
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If


' Change to the "images" sub-directory located under our FTP account's home directory.
success = ftp.ChangeRemoteDir("images")
If (success <> True) Then
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If


ftp.ListPattern = "*.png"

' Fetch the current remote directory contents by calling GetDirCount
Dim n As Integer = ftp.GetDirCount()
If (n < 0) Then
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If


Dim i As Integer = 0
Dim filename As String
Dim sbLocalPath As New Chilkat.StringBuilder

While i < n
    filename = ftp.GetFilename(i)
    Debug.WriteLine(filename)

    ' Download this file.
    sbLocalPath.SetString("qa_output/")
    sbLocalPath.Append(filename)
    success = ftp.GetFile(filename,sbLocalPath.GetAsString())
    If (success <> True) Then
        Debug.WriteLine(ftp.LastErrorText)
        Exit Sub
    End If


    i = i + 1
End While