Dir.chdir does not work on windows (xp)

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.

Hi,

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

Cheers,

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.


frmsrcurl:
http://compgroups.net/comp.lang.ruby/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