From: Alex Young <alex@...>
Date: 2007-06-26T03:35:56+09:00
Subject: Re: could anyone help me in the question, thanks?

Sonn Ygg wrote:
> In network application, we need to fill some fields of protocol header
> like below (in C):
> 
> struct hdr {
>      unsinged short ver;
>      unsinged char  len;
>      unsinged char  flg;
>      ......
> };
> 
> int main(void)
> {
>     struct hdr hh;
>     hh.ver = 0x1;
>     hh.len = 0x2;
>     hh.flg = 0x3;
>     ...
>     send(sock, &hh, sizeof(hh), 0);
>     ...
> }
> 
> How could I do above in Ruby because I don't find how to specify the
> data type of variables or the address of variables in Ruby so far? I
> will deeply appreciate if anyone gives me any hint about it? Thanks a
> lot.
> 
You only need to worry about the types at the 
serialisation/deserialisation interface, and you can do that with 
Array#pack and String#unpack.  There's also bitstruct at 
http://raa.ruby-lang.org/project/bit-struct/ if your needs are more 
complicated.

-- 
Alex