From: "ara.t.howard" <ara.t.howard@...>
Date: 2007-07-04T03:23:29+09:00
Subject: Re: mac addr determination


On Jul 3, 2007, at 11:56 AM, Tim Pease wrote:

> On 7/3/07, ara.t.howard <ara.t.howard@gmail.com> wrote:
>>
>> > def mac_address
>> >      return @mac_address if defined? @mac_address
>> >      re =  %r<(?:hwaddr|:)\s+((?:[0-9a-f]{1,2}[-:]){5}[0-9a-f] 
>> {1,2})
>> > \s*$>i
>> >      lines =
>> >        begin
>> >          IO.popen('ifconfig'){|fd| fd.readlines}
>> >        rescue
>> >          IO.popen('ipconfig /all'){|fd| fd.readlines}
>> >        end
>> >      candidates = lines.map{|l| re.match( l )[1] rescue  
>> nil }.compact
>> >      @mac_address = candidates.first
>> >    end
>> >
>>
>> can someone give this version a whirl on windows?
>>
>
> $ ruby --version
> ruby 1.8.5 (2006-12-25 patchlevel 12) [i386-cygwin]
>
> $ ruby t.rb
> t.rb:14: command not found: ifconfig
> t.rb:11:in `mac_address': undefined method `[]' for nil:NilClass  
> (NoMethodError)
>        from t.rb:14
>
> $ cat t.rb
> def mac_address
>  return @mac_address if defined? @mac_address
>  re = %r/[^:\-](?:[0-9A-Za-z][0-9A-Za-z][:\-]){5}[0-9A-Za-z][0-9A- 
> Za-z][^:\-]/o
>  lines =
>    begin
>      IO.popen('ifconfig'){|fd| fd.readlines}
>    rescue
>      IO.popen('ipconfig /all'){|fd| fd.readlines}
>    end
>  candidates = lines.select{|line| line =~ re}
>  @mac_address = candidates.first[re].strip
> end
>
> puts mac_address
>
>
> IO.popen, it appears, does not raise an exception when the ifconfig
> command is not found. Strange.
>

forgot about that!  check my open4 code to see the work around: an  
exception must be propogated back up the pipe!


> Blessings,
> TwP
>

-a
--
we can deny everything, except that we have the possibility of being  
better. simply reflect on that.
h.h. the 14th dalai lama