From: Tim Hunter <TimHunter@...>
Date: 2009-02-16T09:19:19+09:00
Subject: Re: invalid byte sequence in US-ASCII (ArgumentError)

Luther wrote:
> I'm having some trouble migrating from 1.8 to 1.9.1. I have this line of
> code:
> 
> text.gsub! "\C-m", ''
> 
> ...which generates this error:
> 
> /home/luther/bin/dos2gnu:16:in `gsub!': invalid byte sequence in
> US-ASCII (ArgumentError)
> 
> The purpose is to strip out any ^M characters from the string. I've
> tried a couple of different magic comments with utf-8, but the error
> message still shows the same "US-ASCII". I also tried changing the \C-m
> to 13.chr, but I still got the same error, suggesting that control
> characters aren't even allowed in strings anymore.
> 
> I'm sure this must be a common migration problem, but I can't find a
> solution no matter how hard I search the web. Any help would be greatly
> appreciated.
> 
> Luther
> 
> 
> 

Since Ruby is claiming the source file is US-ASCII it seems likely that 
it's not noticing the magic comment. Make sure your magic comment is the 
first line in the script, or if you're using a shebang line, the second 
line. That is, either

# encoding: utf-8

or

#! /usr/local/bin/ruby
# encoding: utf-8

-- 
RMagick: http://rmagick.rubyforge.org/