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)) -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
