DataFlex

Throttle FTP Transfer Bandwidth

Demonstrates the bandwidth properties BandwidthThrottleUp and BandwidthThrottleDown, and the read-only UploadTransferRate and DownloadTransferRate.

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: Throttling caps the approximate transfer rate in bytes per second (0 means unlimited), which is how a background sync avoids starving interactive traffic on a shared or metered link. The rate properties report the current measured throughput, updated during transfers, so you can display progress or confirm the throttle is taking effect. Treat the limits as approximate targets rather than hard ceilings.

Chilkat DataFlex Downloads

Download Chilkat for DataFlex

DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoFtp
    String sTemp1
    Integer iTemp1

    Move False To iSuccess

    Get Create (RefClass(cComChilkatFtp2)) To hoFtp
    If (Not(IsComObjectCreated(hoFtp))) Begin
        Send CreateComObject of hoFtp
    End

    Set ComHostname Of hoFtp To "ftp.example.com"
    Set ComUsername Of hoFtp To "myFtpLogin"

    //  Limit the approximate transfer rate in bytes per second.  0 (the default) means no limit.
    //  Throttling is useful to avoid saturating a shared link.
    Set ComBandwidthThrottleDown Of hoFtp To 1048576
    Set ComBandwidthThrottleUp Of hoFtp To 524288

    //  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.
    Set ComPassword Of hoFtp To "myPassword"

    Get ComConnect Of hoFtp To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoFtp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComGetFile Of hoFtp "public_html/bigfile.zip" "qa_output/bigfile.zip" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoFtp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  The current average rates are updated during transfers.
    Get ComDownloadTransferRate Of hoFtp To iTemp1
    Showln "Download rate: " iTemp1 " bytes/sec"
    Get ComUploadTransferRate Of hoFtp To iTemp1
    Showln "Upload rate: " iTemp1 " bytes/sec"

    Get ComDisconnect Of hoFtp To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoFtp To sTemp1
        Showln sTemp1
        Procedure_Return
    End



End_Procedure