DataFlex

Connect to an FTP Server Without Logging In

Demonstrates the Chilkat Ftp2.ConnectOnly method, which establishes the connection (including any proxy and TLS setup) and receives the greeting, but does not send USER or PASS. It takes no arguments; authentication is completed with LoginAfterConnectOnly.

Background: Splitting connect from login gives you a window between the two — to read the greeting, decide which account to use, or set up TLS options that depend on the server — that the all-in-one Connect does not. After ConnectOnly the control connection is open and CheckConnection returns true even though the session is not yet authenticated.

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DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoFtp
    String sTemp1

    Move False To iSuccess

    //  Demonstrates the Ftp2.ConnectOnly method, which establishes the connection (including any proxy
    //  and TLS setup) and receives the greeting, but does NOT send USER or PASS.  It takes no
    //  arguments.  Authentication is completed separately with LoginAfterConnectOnly.

    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 ComPort Of hoFtp To 21

    //  Connect without logging in.
    Get ComConnectOnly Of hoFtp To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoFtp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "Connected (not yet logged in)."

    //  The greeting is now available; credentials can be set based on it, then authenticate.
    Set ComUsername Of hoFtp To "myFtpLogin"
    Set ComPassword Of hoFtp To "myPassword"

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

    Showln "Logged in."

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



End_Procedure