I'm looking for a script that will batch convert files from 3ds to dae format using sketchup.

I have found this script in an old thread

#convert skp to obj
#every thumb is putted in a created dir with name of related skp model's name
#skppath is the residence of skpfiles

require 'sketchup.rb' 
if(not file_loaded?("skp2obj.rb")) 
    plugins_menu = UI.menu("Plugins") 
    plugins_menu.add_item("skp2obj") {file_export} 
end 
file_loaded("skp2obj.rb") 


def file_export 

#skp file path
#beware the end "/" e.g. skppath ="c;\skp"
skppath ="C;/Program Files (x86)/Google/Google SketchUp 8/"

#open dir and loop all skps
dir = Dir.open(skppath)
begin
  dir.each {|x|
       next if x !~ /\.skp$/i 
       x = "#{x}"
       sourcefile = skppath+x
       x = x[0,x.length-4]
       destdir = skppath + x + "/"
       destfile = destdir + x +".obj"

         #mak dir
       Dir.mkdir(destdir)
       
       #open modle file
       Sketchup.file_new
         status = Sketchup.open_file sourcefile
         if (!status) 
           UI.messagebox "error; " + sourcefile
      end
      
      #export obj
         status = Sketchup.active_model.export destfile
         if (!status) 
           UI.messagebox "error; " + sourcefile
      end
    }
ensure
  dir.close
end

    UI.messagebox "Finished" 
end


and tried to modify it to import and export
#convert skp to dae
#every thumb is putted in a created dir with name of related skp model's name
#skppath is the residence of skpfiles

require 'sketchup.rb' 
if(not file_loaded?("3ds2dae.rb")) 
    plugins_menu = UI.menu("Plugins") 
    plugins_menu.add_item("3ds2dae") {file_export} 
end 
file_loaded("3ds2dae.rb") 


def file_export 

#skp file path
#beware the end "/" e.g. skppath ="i;/skp/skptest/model/error/"
skppath ="C;/skp/"

#open dir and loop all skps
dir = Dir.open(skppath)
begin
  dir.each {|x|
       next if x !~ /\.skp$/i 
       x = "#{x}"
       sourcefile = skppath+x
       x = x[0,x.length-4]
       destdir = skppath + x + "/"
       destfile = destdir + x +".dae"

         #make dir
       Dir.mkdir(destdir)
       
       #open model file
       Sketchup.file_new
         status = model.import sourcefile
         if (!status) 
           UI.messagebox "error; " + sourcefile
      end
      
      #export dae
         status = Sketchup.active_model.export destfile
         if (!status) 
           UI.messagebox "error; " + sourcefile
      end
    }
ensure
  dir.close
end

    UI.messagebox "Finished" 
end

But it seems my RubyFU is not strong enough. Any help would be appreciated.