From: Joel VanderWerf <joelvanderwerf@...>
Date: 2010-06-25T14:26:42+09:00
Subject: Re: writing binary file

Ted Flethuseo wrote:
> Hi everyone,
> 
> I'm trying to write a couple of numbers to a binary file:
> 
> num = [1234567, 30, 40]
> File.open("test.file", "wb") { |f|
>   num.each { |e| f.write e.to_i.pack("I") }

you gotta put the integers in an array.

 >> 3.pack "I"
NoMethodError: undefined method `pack' for 3:Fixnum
	from (irb):1
 >> [3].pack "I"
=> "\003\000\000\000"

And use * for your num array:

 >> [1,2,3].pack "I*"
=> "\001\000\000\000\002\000\000\000\003\000\000\000"