DataFlex

Upload to an SFTP Server Using an Open Handle

Demonstrates the Chilkat SFtp.UploadFile method, which streams a local file to a remote file identified by an open handle. The first argument is the handle (from OpenFile) and the second is the local file path. Close the handle with CloseHandle when done.

Note: This example uses relative local paths, which are resolved against the application's current working directory. Absolute local paths may also be used. Supply the paths appropriate to your own environment.

Background: This is the lower-level upload, useful when you need control that UploadFileByName does not offer — for example choosing the exact create disposition (create-new versus truncate versus append) via OpenFile, or reusing a handle across operations. The transfer itself is streamed and unbounded by memory. The trade-off is that you own the handle's lifetime and must close it explicitly.

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Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoSftp
    Integer iPort
    String sPassword
    String sHandle
    String sTemp1
    Boolean bTemp1

    Move False To iSuccess

    //  Demonstrates the SFtp.UploadFile method, which streams a local file to a remote file that is
    //  identified by an open handle.  The 1st argument is the handle and the 2nd is the local file
    //  path.

    Get Create (RefClass(cComChilkatSFtp)) To hoSftp
    If (Not(IsComObjectCreated(hoSftp))) Begin
        Send CreateComObject of hoSftp
    End

    //  Connect, authenticate, and initialize the SFTP subsystem.
    Move 22 To iPort
    Get ComConnect Of hoSftp "sftp.example.com" iPort To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoSftp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  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.
    Move "mySshPassword" To sPassword

    Get ComAuthenticatePw Of hoSftp "mySshLogin" sPassword To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoSftp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComInitializeSftp Of hoSftp To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoSftp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  Open (creating/truncating) the remote file for writing.  OpenFile returns a handle string.
    Get ComOpenFile Of hoSftp "subdir/report.pdf" "writeOnly" "createTruncate" To sHandle
    Get ComLastMethodSuccess Of hoSftp To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoSftp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  Stream the local file to the open remote handle.  The transfer is not limited by memory.
    Get ComUploadFile Of hoSftp sHandle "qa_data/report.pdf" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoSftp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  Close the remote handle when the upload is complete.
    Get ComCloseHandle Of hoSftp sHandle To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoSftp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "Uploaded."

    Send ComDisconnect To hoSftp


End_Procedure