It is simply awesome! Thanks!
понедельник, 27 июля 2015 г., 22:54:22 UTC+3 пользователь Matthew Flatt написал:
> At Sun, 26 Jul 2015 22:42:48 -0700 (PDT), Слава ПолноеИмя wrote:
> > Sorry, list, for dumb unprofessional question, but I'm not even amateur
> > programmer)
> > How can I convert string and floats to bytes, that can be passed to
> > udp-send?
> > Tried real->floating-point-bytes and string->bytes/utf-8 but it produces
> > not
> > compatible output.
>
> The `real->floating-point-bytes` bytes conversion gives you a machine
> representation of number. To convert bytes back to a number, you'd use
> `floating-point-bytes->real`.
>
> Alternatively, you could use `number->string` to get a human-readable
> encoding of a number, and then using `string->bytes/utf-8` to encode
> the string into bytes. The reverse would be `bytes->string/utf-8` and
> then `string->number`.
>
>
> > Any best practices of forming udp datagrams in racket exists?
>
> A more general strategy would be to use `write` to convert anything to
> bytes, then then use `read` to convert back from a byte string to the
> value. The `read` and `write` functions work on ports, and some ports
> can write to or read from a byte string. This approach works for
> numbers, strings, symbols, lists, and other things that can round-trip
> with `read` and `write`.
>
> (define (value->bytes v)
> (define o (open-output-bytes))
> (write v o)
> (get-output-bytes o))
>
> (define (bytes->value bstr)
> (define i (open-input-bytes bstr))
> (read i))
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