Write Text at a 64-bit Offset in a Remote SFTP File

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Demonstrates the Chilkat SFtp.WriteFileText64 method, which encodes text and writes it at a specific 64-bit byte offset in an open handle. The arguments are the handle, the offset, the charset, and the text. The 64-bit offset supports very large files.

Background: A 32-bit offset tops out at about 4 GB, so files larger than that require the 64-bit form to address positions beyond that boundary. The behavior is otherwise identical to the 32-bit version — the only difference is the width of the offset argument, chosen to match the size of the file you are working with.

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    success := false

    //  Demonstrates the SFtp.WriteFileText64 method, which encodes text and writes it at a specific
    //  64-bit byte offset in an open handle.  The 1st argument is the handle, the 2nd is the offset,
    //  the 3rd is the charset, and the 4th is the text.  The 64-bit offset supports very large files.

    sftp := chilkat.NewSFtp()

    //  Connect, authenticate, and initialize the SFTP subsystem.
    port := 22
    success = sftp.Connect("sftp.example.com",port)
    if success == false {
        fmt.Println(sftp.LastErrorText())
        sftp.DisposeSFtp()
        return
    }

    //  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.
    password := "mySshPassword"

    success = sftp.AuthenticatePw("mySshLogin",password)
    if success == false {
        fmt.Println(sftp.LastErrorText())
        sftp.DisposeSFtp()
        return
    }

    success = sftp.InitializeSftp()
    if success == false {
        fmt.Println(sftp.LastErrorText())
        sftp.DisposeSFtp()
        return
    }

    handle := sftp.OpenFile("subdir/hugefile.dat","readWrite","openOrCreate")
    if sftp.LastMethodSuccess() == false {
        fmt.Println(sftp.LastErrorText())
        sftp.DisposeSFtp()
        return
    }

    //  Write at a byte offset beyond the 32-bit (4 GB) range.
    offset := 5000000000
    success = sftp.WriteFileText64(*handle,offset,"utf-8","MARKER")
    if success == false {
        fmt.Println(sftp.LastErrorText())
        sftp.DisposeSFtp()
        return
    }

    success = sftp.CloseHandle(*handle)
    if success == false {
        fmt.Println(sftp.LastErrorText())
        sftp.DisposeSFtp()
        return
    }

    fmt.Println("Wrote at the 64-bit offset.")

    sftp.Disconnect()

    sftp.DisposeSFtp()