Dir.chdir does not work on windows (xp)

ruby-talk
1

Hi all ,

I am using Dir.chdir to change my current working directory.

class Test

  def initialize
    spin
  end

  def spin
    dire = "/c/Target/tioga-1.11/samples"
    dire2 = "c:\Target\tioga-1.11\samples"
    Dir.chdir(dire2)
    #system("cd", dire)
  end

end

My original project inundates with errors
"The System cannot find the path specified"
& this test program says no such file or directory.
Even on MSYS Dir.chdir(dire) does not work !

There are other Dir routines like Dir.each() which gives the error

    undefined method `each' for nil:NilClass [version: 1.11]

Can you please help me correct these errors.

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2

Hi,

Try using double backslashes: "c:\\Target\\tioga-1.11\\samples"

Cheers,

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3

Looks like you're using cygwin paths for a non-cygwin version of Ruby.

Mismatch those is not good, and that would be the reason you can chdir properly.

First check your ruby version (ruby -v) if it says "mswin32" or "mingw32", you should use drive letters.

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frmsrcurl: http://compgroups.net/comp.lang.ruby/Dir.chdir-does-not-work-on-windows-xp

4

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.

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====================================================
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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