From: Sathvik La <sathvikl@...>
Date: 2009-12-26T05:42:40+09:00
Subject: Re: Dir.chdir does not work on windows (xp)

Thank you for your replies.
Yes the Ruby version says i386-mswin32
and when I used "c:\\Target\\tioga-1.11\\samples" I could chdir.

I need to execute another program and parse the output. So I used 
IO.popen
http://ruby-doc.org/core/classes/IO.html

    pdflatex = "pdflatex"
    @save_dir = "figures_out"
    name = "red"
    syscmd = "cd #{@save_dir} & #{pdflatex} -interaction=nonstopmode 
#{name}.tex"
    puts syscmd
    IO::popen(syscmd, "r+")
    puts $?

It does not work. pdflatex complains Invalid Argument. However when I 
replace
IO::popen(syscmd, "r+") with system(syscmd) it does work but I cannot 
read the output back.

Can you please tell me why does this happen OR a workaround to achieve 
my goal.

====================================================
Here is the actual code

      @measures = {}
      IO::popen(syscmd, "r+") do |f|
        #puts $?
        f.close_write           # We don't need that.
        log = File.open(logname, "w")
        for line in f
          log.print line
          if line =~ /^(.*)\[(\d)\]=(.+pt)/
            n = $1
            num = $2.to_i
            dim = Utils::tex_dimension_to_bp($3)
            @measures[n] ||= []
            @measures[n][num] = dim
          end
        end
      end


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