(VB.NET UWP/WinRT) Restart/Resume FTP Upload

Demonstrates how to restart / resume an FTP upload.

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


' Change to the remote directory where the file will be uploaded.
success = Await ftp.ChangeRemoteDirAsync("temp")
If (success <> True) Then
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If


' In this example, assume that a previous FTP upload failed,
' and the incomplete file (bigFile.zip) exists on the FTP server.
' You only need to set the RestartNext property to resume
' the upload.  When RestartNext is set, the next call
' to PutFile (or PutFileFromBinaryData, PutFileFromTextData)
' will automatically resume the upload from the point of failure.
' (The way it works is that the FTP component sends a "SIZE"
' command to the FTP server to find out how many bytes of
' the file already exist on the server.  It then begins
' uploading from that point.

' Note: After PutFile is called, the RestartNext property
' is automatically set to false.
ftp.RestartNext = True

' Upload a file with restart.
Dim localFilename As String = "bigFile.zip"
Dim remoteFilename As String = "bigFile.zip"

success = Await ftp.PutFileAsync(localFilename,remoteFilename)
If (success <> True) Then
    Debug.WriteLine(ftp.LastErrorText)
    Exit Sub
End If


success = Await ftp.DisconnectAsync()

Debug.WriteLine("File Uploaded!")