From: nobu.nokada@...
Date: 2003-02-17T08:56:20+09:00
Subject: Re: C-like cast from String to Integer needed.

Hi,

At Mon, 17 Feb 2003 08:23:48 +0900,
Michael Bruschkewitz wrote:
> I read some data from, for example, Tcp.
> These data are read into a String.
> Somewhere in these String are 4 bytes, which are the binary 
> representation of an Integer.
> I hope there is a faster, native, solution than:
>  i = (((s[ofs+0]*256)+s[ofs+1])*256+s[ofs+2])*256+s[ofs+3]
> ... but I don't see this. 

s.unpack("@#{ofs}N")

> In C++, it would look somehow like this:
> char s[1024]; recv(so,s,sizeof s, 0); // this line not interesting
> int y = *(int*)(s+ofs); // this line needed in Ruby.

Note that it's not portable.

-- 
Nobu Nakada