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Upload a Large File in Chunks (FTP)

Demonstrates the Chilkat Ftp2.LargeFileUpload method, which uploads a local file as a sequence of transfers, each up to a given chunk size. The arguments are the local path, the remote path, and the chunk size in bytes.

Note: The local paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Some servers, proxies, or firewalls impose a limit on the size or duration of a single data transfer, which a very large file can exceed. This method sidesteps that by sending the file in pieces — the first with STOR to create or replace the file, each subsequent one appended — so no single transfer is oversized. Choose a chunk size comfortably under whatever limit you are working around.

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Local $bSuccess = False

;  Demonstrates the Ftp2.LargeFileUpload method, which uploads a local file as a sequence of
;  transfers, each up to a given chunk size.  The 1st argument is the local path, the 2nd is the
;  remote path, and the 3rd is the chunk size in bytes.

$oFtp = ObjCreate("Chilkat.Ftp2")

$oFtp.Hostname = "ftp.example.com"
$oFtp.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.
$oFtp.Password = "myPassword"

$bSuccess = $oFtp.Connect()
If ($bSuccess = False) Then
    ConsoleWrite($oFtp.LastErrorText & @CRLF)
    Exit
EndIf

;  The first chunk is sent with STOR (creating/replacing the remote file); each later chunk is
;  appended.  Uploading in chunks can work around server or network limits on a single transfer.
Local $iChunkSize = 10485760
$bSuccess = $oFtp.LargeFileUpload("qa_data/bigfile.zip","uploads/bigfile.zip",$iChunkSize)
If ($bSuccess = False) Then
    ConsoleWrite($oFtp.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Large file uploaded." & @CRLF)

$bSuccess = $oFtp.Disconnect()
If ($bSuccess = False) Then
    ConsoleWrite($oFtp.LastErrorText & @CRLF)
    Exit
EndIf