From: Haruka YAGNI <hyagni@...>
Date: 2011-04-01T17:03:08+09:00
Subject: Re: SImple question about file io

Hello again, Paul

I found another problem.  I am sorry not to include this in the previous post.

As you set "opf" inside the each_line loop, "opt.puts line"(where I add a mark)
won't work when both contents of ifs are not processed, i.e. the opf
is not defined
inside the loop.

To solve this problem, add definition of opf ("opf = nil") before the loop.


Look at next examples

-- code 1
flag = false

1.upto(3) do |i|
  unless flag
    bad_var = 1000
    flag = true
  end
  puts "#{i}, #{bad_var.nil?}"
end

-- result 1
1, false
2, true
3, true

-- code 2
flag = false

bad_var = nil # << bad_var is defined here
1.upto(3) do |i|
  unless flag
    bad_var = 1000
    flag = true
  end
  puts "#{i}, #{bad_var.nil?}"
end

-- result 2
1, false
2, false
3, false


On Fri, Apr 1, 2011 at 4:31 PM, Paul Joyce <pjoyce@whatsthis.ie> wrote:
>
> #puts template
> ipf = File.new("All-Contracts-29-Mar-11.csv","r")
>      ipf.each_line { |line|
>      next if line.match(/^$/)
>      data = line.split(",")
>      if curr == "x"     #  Initialize
>        puts "Initialize . . " + data[0]
>        opf = File.new(data[0] + '-feeder-customer.csv',"r+")
>        opf.puts colhead   # <-----  HERE
>      end
>      if curr != data[0] and curr != "x"
>         puts "New File . . . " + data[0]
>         opf.close
>         opf = File.new(data[0] + "-feeder-customer.csv","r+")
>         opf.puts colhead
>      end
>      opf.puts line ## <-- This occurs a nil class error
>      curr = data[0]
>    }
> ipf.close;
> opf.close;
>
> puts 'DONE.'
>

-- 
Haruka YAGNI