B4X

Restart/Resume FTP Upload

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Demonstrates how to restart / resume an FTP upload. B4X

Dim success As Boolean = False

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

Dim ftp As ChilkatFtp2
ftp.Initialize("ftp")

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

'  Connect and login to the FTP server.
success = ftp.Connect
If success <> True Then
    Log(ftp.LastErrorText)
    Return
End If


'  Change to the remote directory where the file will be uploaded.
success = ftp.ChangeRemoteDir("temp")
If success <> True Then
    Log(ftp.LastErrorText)
    Return
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 = ftp.PutFile(localFilename, remoteFilename)
If success <> True Then
    Log(ftp.LastErrorText)
    Return
End If


success = ftp.Disconnect

Log("File Uploaded!")