Pre-Allocate Server Space Before an FTP Upload (ALLO)

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Demonstrates the AllocateSize property, which sends the FTP ALLO command to pre-allocate disk space on the server before an upload. Set it to the size in bytes of the file about to be uploaded.

Background: ALLO asks the server to reserve storage in advance, a requirement of certain legacy systems — older mainframes in particular — that need the exact file size up front to allocate a dataset. Modern servers allocate space dynamically and typically ignore or accept ALLO without needing it, so most applications never set this. Provide it only when targeting a host known to require pre-allocation.

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    success := false

    ftp := chilkat.NewFtp2()

    ftp.SetHostname("ftp.example.com")
    ftp.SetUsername("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.
    ftp.SetPassword("myPassword")

    success = ftp.Connect()
    if success == false {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        return
    }

    //  AllocateSize sends the FTP ALLO command to pre-allocate disk space on the server before an
    //  upload.  It is rarely needed -- mainly for certain legacy systems that require the exact size
    //  in advance -- since most servers allocate space dynamically.  Set it to the size in bytes of
    //  the file about to be uploaded.
ERROR: Assignment type mismatch.  ExpressionType=int, atgType=uint

    success = ftp.PutFile("qa_data/bigfile.zip","uploads/bigfile.zip")
    if success == false {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        return
    }

    fmt.Println("Uploaded with pre-allocation.")

    success = ftp.Disconnect()
    if success == false {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        return
    }


    ftp.DisposeFtp2()