From: Adrian Roskrow <adrian@...10systems.co.uk>
Date: 2007-01-18T04:53:53+09:00
Subject: Re: Reading from $stdin

Robert Klemme wrote:
> On 17.01.2007 14:56, Adrian Roskrow wrote:
>> I need to read from a usb connected barcode reader and I thought ruby
>> would be a good way to do it. I have written a quick program to read
>> from the $stdin object but it just sits there and waits. Im very new to
>> ruby so I have probably made a fundamental mistake. Can anyone see what
>> I have done, or can anyone point me in the right direction or provide an
>> example?
> 
> Do you actually redirect stdin to read from that device?
> 
>> Below is a simple bit of code
>> 
>> #!/usr/bin/env ruby
>> text = $stdin.read
>> lines = text.split("\n")
>> i = 1
>> for line in lines do
>>   puts "#{i}. " + line
>>   i += 1
>> end
> 
> I'd rather do
> 
> $stdin.each do |line|
>    printf "%4d %s", $stdin.lineno, line
> end
> 
> or
> 
> $stdin.each_with_index do |line, index|
>    printf "%4d %s", index, line
> end
> 
> HTH
> 
> Kind regards
> 
>   robert

Hi

In answer to your question, no I don't redirct stdin, should I?

I like your code snippets and will try them out post hast.

Thanks

Adrian


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