[Code] PCFileTools

[Code] PCFileTools

Postby TIG » Thu Feb 02, 2012 1:18 pm

This is my attempt to get over the issue of UTF-8 characters on PCs [only] when filepaths etc return incorrect results in some of Ruby's native File and Dir methods.
It uses win32ole.so, which you need to have an appropriate version of in Plugins
[ viewtopic.php?p=380121#p380121 ]
It returns correct results as far as I've tested it...
Can some of you try testing it too...
e.g. replace File.exist?() with PCFile.exist?()
and see if filepaths with accented characters etc are then returned 'true' [properly]...
These methods mimic the native tools fairly well and there are also some 'better' copy/move/rename methods; but there's no 'binmode' and the read/write syntax etc is slightly different [but still logical]...
###
PCFileTools.rb

###
(c) TIG 2012
Permission to use, copy, modify, and distribute this software for
any purpose and without fee is hereby granted, provided that the above
copyright notice appear in all copies.
THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

PCFileTools.rb

Adds new PC ONLY tools similar to the Ruby 'File' and 'Dir' tools,
BUT which avoid issues with UTF-8 characters in filepaths etc...
[NOTE: MACs have no equivalent issues so they don't need this!]

PCFile... & PCDir...

They generally work like the Ruby equivalent
So
File.exist?("C:/Temp/boué.txt")
which will WRONGLY return 'false,' is replaced by
PCFile.exist?("C:/Temp/boué.txt")
which correctly returns 'true'...

###

PCFile.basename( fileName [, aSuffix] )
returns the basename of the file or folder, e.g. "C:/Temp/file.txt"
-> "file.txt" ; if the 'aSuffix' is used then any matching extension
is stripped, using ".*" removes ANY file extension - e.g. -> "file".

PCFile.delete( fileName )
deletes the given file; if it's not an 'absolute path' the file is
sought in the pwd.

PCFile.dirname( fileName)
returns the directory [path] of the passed filepath, stripping the
terminal file/folder; e.g. "C:/Temp/file.txt" -> "C:/Temp"

PCFile.directory?( fileName )
returns true or false, depending on whether or not the given
'fileName' refers to a 'directory'.

PCFile.exist?( fileName )
returns true or false, depending on whether or not the given file
[OR folder] exists.

PCFile.extname( fileName )
returns the extension-name [if any] of the passed file;
e.g. "C:/Temp/file.txt" > ".txt"

PCFile.ftype( fileName )
returns the type of the object as 'directory' or 'file'.
[Note that it is more limited that native File.ftype()]

PCFile.join( string, string* )
joins strings to return a file-path;
e.g. PCFile.join("C:/Temp", "boué.txt") -> "C:/Temp/boué.txt"

PCFile.rename( fileName, newName )
renames the file 'fileName' as 'newName'; unlike File.rename(...) it
can 'move' a file to a new folder, if the specified folder exists,
if no folder path is given it assumes the same folder as 'fileName'.

PCFile.move( fileName, nname )
equivalent to PCFilename.rename(...)

PCFile.copy( fileName, newName, [overwrite=false] )
makes a copy of the file 'fileName' as 'newName'; it can 'copy' a file
to a new folder, if the specified folder exists, if no folder path is
given it assumes the same folder as 'fileName'.
If a 'true' 3rd argument is given then any existing file is
overwritten, if a 'false' or no 3rd argument is given then any
existing file is NOT overwritten.

PCFile.new( fileName, [modeString="r"] )
opens a file as f=PCFile.new(...), making it or using it if it exists,
the mode defaults to "r" = 'read', the options are:
"r" =read
"r+" =read+write
"w" =write
"w+" =write+read
"a" =append
"a+" =append+read

PCFile.open( fileName, [modeString="r"] )
equivalent to PCFile.new(...)

NOTE: the slightly different syntax for the read/write/close file 'f'...
[there is no 'binmode']

PCFile.read(f)
reads all of the contents of the new/open file 'f'.

PCFile.readline(f)
reads the first line of the new/open file 'f'.

PCFile.readlines(f)
reads all of the lines of the new/open file 'f' as an array of lines.

PCFile.write(f, string)
writes the 'string' to the new/open file 'f', with no added \n

PCFile.print(f, string)
writes the 'string' to the new/open file 'f', with no added \n

PCFile.puts(f, string|array)
writes the 'string' to the new/open file 'f', adding a \n;
if it's an array it writes it a line at a time adding \n to each line.

PCFile.close(f)
closes the new/open file 'f' made as above, after you've finished
reading/writing it etc.

###

PCDir.pwd
returns the path to the current directory [folder].

PCDir.chdir( dirPath )
changes the current directory [folder] to 'dirPath', if it exists.

PCDir.mkdir( dirPath )
makes the specified new directory [folder].

PCDir.rmdir( dirPath )
deletes the specified directory - note that unlike the Dir. method it
will remove a directory [folder] even if it contains files!

PCDir.exist?( dirPath )
returns true or false, depending on whether or not the folder exists.

PCDir.copy( dirPath, dirNew )
makes a copy of a folder at the new location/name.

PCDir.move( dirPath, dirNew )
moves a folder to the new location/name.

PCDir.entries( dirPath )
returns an array of the names all of the files/folders within the
specified folder [including '.' and '..']

NOTE:
Requires a compatible version of 'win32ole.so' in the Plugins folder.
Available from here:
viewtopic.php?p=380121#p380121

Donations:
info @ revitrev.org via PayPal.com

Version:
1.0 20120202 First release.
###
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Re: PCFileTools

Postby Dan Rathbun » Fri Feb 03, 2012 3:01 am

Took a quick look.

It's a good start.

First thoughts:
  1. The methods should act the same as the native Ruby methods, so that they can be a replacement (via aliasing within an Author's namespace.)
  2. They need to be wrapped within some library namespace. (TIG::Lib, SKX::WIN, etc.)
  3. The container's need to be classes, not modules.
  4. They need to be subclasses of the Ruby baseclasses, so that they inherit all the methods that you will not be overriding.

So, as an example, let's say you put them in SKX::WIN

They would need to be declared:
Code: Select all
class SKX::WIN::Dir < ::Dir
  ### the overriden methods
end#class

class SKX::WIN::File < ::File
  ### the overriden methods
end#class


Within an author's namespace, he could use a local constant File, that points at your subclasses:
Code: Select all
module Author
  class FancyTool

    File = SKX::WIN::File
    # now he can use it as he's always done.

    # he can always refer to the base class,
    # by using the toplevel scope prefix, thus:
    ::File.basename(pathstring)

    # or if he's done using the PC specific class,
    # he can make the local constant to point at
    # the base class again, by reassignment:
    File = ::File
    #
    # or by removing the local constant, thus:
    remove_const(:File)
 
  end#class
end#module
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Re: PCFileTools

Postby Dan Rathbun » Fri Feb 03, 2012 3:39 am

    Here's a better conditional load wrapper:
    Code: Select all
    $LOAD_MSGS = '' unless defined($LOAD_MSGS)
    unless RUBY_PLATFORM =~ /(mswin|mingw)/
      msg = "Error: #{File.basename(__FILE__)}: loads PC only subclasses!\n"
      msg<< "This platform's #{RUBY_PLATFORM} is not recognized."
      puts(msg)
      $LOAD_MSGS << msg
    else
      # running on Windows
      begin
        require('win32ole.so')
      rescue LoadError => e
        msg = "Error: #<LoadError: in #{File.basename(__FILE__)}.>\n"
        msg<< "The shared library file: 'win32ole.so' could not "
        msg<< "be found using the $LOAD_PATH search array.\n"
        msg<< "Please install the 'win32ole.so' where it can be found.\n"
        puts(msg)
        $LOAD_MSGS << msg
      else
        # The 'win32ole.so' file WAS loaded...
       
        #
        ### define subclasses HERE
        #
       
        unless file_loaded?(File.basename(__FILE__))
          file_loaded(File.basename(__FILE__))
        end

      end# win32ole required
      #
    end#unless on PC


    The ### define subclasses HERE line can actually load the definition file (to save indents):
    require('skx/win/file_dir_defs.rb')
    and the file can have a exit clause at the top (just in case):
    Code: Select all
    exit(2) unless defined?(WIN32OLE)

    module SKX; end
    module SKX::Win; end

    class SKX::WIN::Dir < ::Dir
      ### method defs ...
    end#class

    class SKX::WIN::File < ::File
      ### method defs ...
    end#class
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    Re: PCFileTools

    Postby TIG » Fri Feb 03, 2012 11:02 am

    Dan

    I'm sure that the 'use' of the core of the code can be made better - although I'd be wary of overwriting base class ?
    A lot of this is 'above my pay grade'...

    I've kept everything separated for testing - so it still works provided you substitute PCFile.exist?(filepath) for File.exist?(filepath) and so on...

    What I'm asking initially is for developers to test these new/replacement PCFile methods and see if they are buggy and/or work as hoped.

    The biggest bind with 1.8~ Ruby File on PCs is that many operations like File.exist?() can return false when you know the file really does exist, these 'failures' are caused by UTF-8 characters in the filepath string [typically these are 'accented letters' in FR/DE/ES/PT/NO etc, but results from Chinese users etc would be great too...].

    I've tried to write simple code using pack/unpack and equivalent Win32OLE methods that return 'true' correctly when the filepath exists and it contains such characters...

    There are many other failures with File that I hope I have now trapped with these equivalent PCFile methods. I've had to make slightly different read/write code to get around some Win32OLE vagaries etc... and I can't see currently how to do the equivalent of 'binmode' etc. Any suggestions/additions gratefully received...

    At this stage I really just want feedback on the efficacy of these methods...
    We can then debate later how the finalized 'fixed' methods are shoehorned into Ruby... ;)
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    Re: PCFileTools

    Postby Dan Rathbun » Fri Feb 03, 2012 10:53 pm

    It's UTF-8 (not UFT-8, BTW.)
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    Re: PCFileTools

    Postby TIG » Fri Feb 03, 2012 11:11 pm

    WTF... Doh! my fingers often type in the wrong order :roll:
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    Re: PCFileTools

    Postby Dan Rathbun » Sat Feb 04, 2012 1:05 am

    TIG wrote:... although I'd be wary of overwriting base class ?

    I didn't say anyone should. I said they should be subclasses of the base class. If they are, Ruby would not let anyone make the subclass overwrite the baseclass, because it would be a circular reference.
      EDIT: I tested this at the console. Ruby does not check for circular references using the c-side = operator. Anyway, it does not actually create a circular reference. The reference to original baseclass becomes un-identified by any constant, but the object can still be got, via the superclass() method.

    Making a LOCAL constant point at an object (in this case a Class definition,) does not overwrite anything.

    Now obviously, if some stupid 'newb' types File = SKX::WIN::File in the Ruby Console, or in an unwrapped script, THAT global constant that references the base class definition object, is changed (and affects all scripts that are also using it.) So, in order to set it back [without restarting,] it might be a good idea to have a 'secret' reference to the base class definition, kept "out of sight."
    Code: Select all
    module Ruby
     
      Refs = {}
      # base classes
      Object.constants.sort.each {|ref|
        obj = Object.class_eval "#{ref}"
        Refs[ref]= obj if obj.class==(Class)
      }
      # base modules
      [Comparable,Enumerable,Errno,FileTest,GC,
       Kernel,Marshal,Math,ObjectSpace,Process].each {|obj|
        Refs[obj.name]= obj
      }
      Refs['TOPLEVEL_BINDING']= TOPLEVEL_BINDING
      Refs.freeze

      def self.reset_object_ref(ref)
        if ref.is_a?(String) || ref.is_a?(Symbol)
          ref = ref.to_s
        elsif ref.is_a?(Module) # includes Class
          ref = ref.name
        else
          return nil
        end
        if Ref.has_key?(ref)
          begin
            eval( "#{ref} = ObjectSpace._id2ref(#{Ref[ref].object_id})", TOPLEVEL_BINDING )
          rescue
            return false
          else
            return true
          end
        end
        return false
      end

    end#module
    ###
    EDIT: I added a reset method to the example, just for kicks.

    TIG wrote:I've kept everything separated for testing - so it still works provided you substitute PCFile.exist?(filepath) for File.exist?(filepath) and so on...

    You won't find many who are willing to go through their code and search and replace, "File." with "PCFile.", besides you haven't provided aliases for the methods you did not implement, which makes a simple editor search and replace, into a tedious manual edit session.

    You might consider, overriding the method_missing callback, whilst you still have them as custom modules:
    Code: Select all
    def method_missing( sym, *args )
      if File.respond_to?(sym)
        File.method(sym).call(*args)
      else
        raise(NoMethodError,"undefined method `#{sym.to_s}' for #{self.name}:#{self.class.name}",caller)
      end
    end#def

    and similar for PCDir:
    Code: Select all
    def method_missing( sym, *args )
      if Dir.respond_to?(sym)
        Dir.method(sym).call(*args)
      else
        raise(NoMethodError,"undefined method `#{sym.to_s}' for #{self.name}:#{self.class.name}",caller)
      end
    end#def
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    Last edited by Dan Rathbun on Sat Feb 04, 2012 5:24 am, edited 2 times in total.
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    Re: PCFileTools

    Postby Dan Rathbun » Sat Feb 04, 2012 4:17 am

      The main point, I'm trying to get across.. is future implementation.
      Ie, how scripters will wish to use unicode extensions to File, Dir and String.

      The goal is to write cross-platform plugins.

      Ex:
      Code: Select all
      MAC =( RUBY_PLATFORM =~ /(darwin)/ ? true : false ) unless defined?(MAC)
      WIN =( not MAC ) unless defined?(WIN)

      module Author
        class FancyTool
       
          if WIN
            require('skx/win/File')
            File = SKX::WIN::File
          end

          # Now he can use File as he's always done.
          #
          # On Mac, there is no local constant "File", and the
          # call is evaluated to the object, that is referenced,
          # by the toplevel constant "File".
          #
          # But on PC, within this namespace ONLY, the call
          # is evaluated, to the object pointed to, by the
          # local (constant) reference "File", or fully
          # qualified: "Author::FancyTool::File",
          # which does not touch ::File (aka: Object::File)
       
        end#class
      end#module


      There is no way, scripters will want to changed all calls to methods of class File or Dir, into platform conditional statements, like:
      Code: Select all
      filename =( WIN ? PCFile.basename(pathstr) : File.basename(pathstr) )

      or (worse):
      Code: Select all
      filename = if WIN
        PCFile.basename(pathstr)
      else
        File.basename(pathstr)
      end


      :geek:
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      Re: PCFileTools

      Postby Dan Rathbun » Sat Feb 04, 2012 4:51 am

      TIG wrote:A lot of this is 'above my pay grade'...

      No doubt that goes for any single ONE rubyist. Something like this needs to be a group project.
      Others have done some work in this area already. ThomThom on wide strings (which also need to be addressed, because many of the base class String methods, will garble unicode strings.)
      Dan Berger's "win32-api" toolkit plays a bit with creating a WideString class. (I think he considers it beta.)
      Also, we should not ignore the extended class Pathname (which is actually a wrapper class, not a String subclass.)

      TIG wrote:We can then debate later how the finalized 'fixed' methods are shoehorned into Ruby... ;)

      OK, I made my point, on this issue.

      The only thing to add is to state the obvious. There are really only 2 alternatives.

      My suggestion is the least invasive, with the least responsibility. (Authors are left to decide to use the extension on a namespace by namespace basis.)

      The other option, to actually redefine any Ruby base classes that will use unicode strings, on the Windows platform(s).
      This would mean taking responsibility for string functionality of ALL plugins (running on Windows.)
      Not what (I think,) you would wish to do. Nor any project group. (Not at least without compensation, of some kind,.... and a lot of time to devote to the "cause.")
      Even the Ruby Core guys are taking forever to implement unicode support.

      Enough said... :roll:
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      Re: PCFileTools

      Postby Dan Rathbun » Sun Feb 05, 2012 2:33 am

      TIG wrote:... and I can't see currently how to do the equivalent of 'binmode' etc. Any suggestions/additions gratefully received..

      Ya know.. it's weird that the Core guys made this switch, without a way to test later IF the stream was IN binmode or not.

      I checked the docs, and the Ruby 1.8.7 branch is still the same.

      BUT... in the 1.9.x trunk, they have added a binmode?() boolean query method. (See the online docs for IO class. They also added methods binread and binwrite, special open methods.)
      Of course, they have added a bunch of options, to read and write in several encodings.
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      Re: PCFileTools

      Postby Dan Rathbun » Sun Feb 05, 2012 9:09 am

        What effect do you imagine WIN32OLE.codepage= WIN32OLE::CP_UTF8 would have over CP_ACP (ANSI?/ASCII?), which seems to be the default.
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        Re: PCFileTools

        Postby Dan Rathbun » Sun Feb 05, 2012 12:56 pm

        Ok TIG.. a general question:

        most all of the methods are doing this:

        arg = arg.unpack("U*").map{|c|c.chr}.join

        which seems to convert a UTF-8 string (if it is one,) to an ANSI string, before passing it to Windows FSO methods that take and return Unicode strings ...

        1) correct ??

        2) and why ??
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        Re: PCFileTools

        Postby TIG » Sun Feb 05, 2012 5:47 pm

        I found that if I didn't do that change to the string then any tests of UTF-8 strings, like PCFile.exist?(path) do not work properly and return 'false' when it should be 'true'... just like the File.exist?(path) version; BUT making that change to the string before testing it seems to return correct results - consistently 'true' when it should be 'true' and 'false' when it should be 'false'. For a simple ANSI character string it works fine either way [the unpack/join has no affect], but if you test with a UTF-8 string with accented characters [perhaps obtained from a UI.openpanel()], that is unpack/joined etc then you can see the difference between what the File.. and PCFile.. versions return...
        There's probably a more elegant way to do this... BUT it seems to work the way I've bodged it together, so now perhaps we can think of better ways of achieving the same difference... :?
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        Re: PCFileTools

        Postby Dan Rathbun » Sun Feb 05, 2012 6:54 pm

        That seems to indicate that the FSO methods are doing ANSI comparisons (perhaps by default.)
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        Re: PCFileTools

        Postby thomthom » Mon Feb 06, 2012 12:42 am

        So, does PCFile.exist?() return true for a file with, for example, Japanese characters?
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        Re: PCFileTools

        Postby Dan Rathbun » Mon Feb 06, 2012 6:04 am

        Would the Japanese Kanji chars be in the UTF-16 set?

        Ya know we are all back to the ol' String encoding problem, really.

        I thot about using Dan Berger's String subclass(es) WideString or whatever he called them, but it seem like it would be combersome. Unless they converted themselves automatically similar to how Numerics use coerce().
        Currently the interpreter always makes ANSI strings from " " and ' ' literals. (and their %dilimeter equivs.)

        I wonder if possible to create a %u function that creates UTF8 strings. And maybe a %U that creates UTF16 ?
        (Are these defined in Kernel, or are they C-side interpreter functions?

        (Just throwing issues in the air, "musing out load.")
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        Re: PCFileTools

        Postby thomthom » Mon Feb 06, 2012 10:25 am

        The underlying problem in Ruby 1.8 under windows is that it calls the A version of the file functions instead of the W versions. If a function is called FileFunction is used in C/C++ - when compiled it will translate to FileFunctionA or FileFunctionW depending on whether UNICODE is defined.
        I was thinking that a C Extension that would forcefully call the FileFunctionW variants would be sure to work as it would be the system doing all the work. Meddling with the string in Ruby is quite likely to cause data to be lost or corrupted.
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        Re: PCFileTools

        Postby TIG » Mon Feb 06, 2012 11:07 am

        I only works for UTF-8 [i.e. 'European' accented-characters etc] - the more complex Chinese/Japanese return false when it should be true :roll:
        However, if we have a way of resolving one hopefully the other will follow...
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        Re: PCFileTools

        Postby TIG » Mon Feb 06, 2012 11:28 am

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        Re: PCFileTools

        Postby Dan Rathbun » Mon Feb 06, 2012 1:26 pm

        BTW.. if interested:

        This is the Extended lib module FileUtils from Ruby v1.8.6-p287
        fileutils.rb
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        Re: PCFileTools

        Postby Dan Rathbun » Mon Feb 06, 2012 1:57 pm

        from the old Pick-axe Book:
        Strings are stored as sequences of 8-bit bytes,[For use in Japan, the jcode library supports a set of operations of strings written with EUC, SJIS, or UTF-8 encoding. The underlying string, however, is still accessed as a series of bytes.] and each byte may contain any of the 256 8-bit values, including null and newline. The substitution mechanisms in Table 18.2* on page 203 allow nonprinting characters to be inserted conveniently and portably.
        * refers to the table of \ codes

        Also Standard Types: Strings



        So it seems that (in my mind,) since Sketchup sets $KCODE to UTF8 when it loads the interpreter, we may not actually have as much of a problem on the Rubyside as I thought.

        So we have a choice...

        1) A pure-Ruby patch, that either accesses the system calls (for File functions,) via WIN32OLE or WIN32API (the so libraries.)

        2) A compiled C patch, ie: "Cut out" the c code files that define classes IO, Dir and File (perhaps also FileTest,) and recompile with either UNICODE #defined, or change the C function calls explicitly to the wide versions. These would be ".so" files, and they would redefine the old methods. (What happens on the C-side when you re-define a C function that has already been defined? Do the C functions that the new Ruby wrappers call, need to be renamed as well?)


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        Re: PCFileTools

        Postby thomthom » Mon Feb 06, 2012 2:11 pm

        I was thinking that a C extension that did most of the functions used, like File.exist?, read, write, delete and list files in folders would go a long way. It wouldn't be as extensive as a complete rewrite - therefor more quicker to develop. Then off course not replacing the existing methods - as it'd just open up a vast pool of possible problems which would require even more testing and development.

        Trying to rewrite the entire File, Dir and IO classes to call the W variant file function just seems like such a massive undertaking that it'd probably never be completed.
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        Re: PCFileTools

        Postby TIG » Mon Feb 06, 2012 2:17 pm

        Does Sketchup set $KCODE to "UTF8" in all locales - I know it does in UK/US and probably European language locales BUT what about Chinese ? I'll ask someone...
        If we get a consistent code for their locale can we modify the pack/join code to say use 'u' not 'U' and get an appropriate conversion in different $KCODE cases ?
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        Re: PCFileTools

        Postby Dan Rathbun » Mon Feb 06, 2012 3:56 pm

        thomthom wrote:Then of course not replacing the existing methods - as it'd just open up a vast pool of possible problems which would require even more testing and development.

        Well what I said before still goes... The new class(es) are in a Library namespace, need to be require(d), and then referenced within an author's namespace via an alias, (as I showed in the examples above.)

        I mispoke when I said redefine, they would have the same identifiers, but be within, say SKX::WIN module namespace.

        thomthom wrote:Trying to rewrite the entire File, Dir and IO classes to call the W variant file function just seems like such a massive undertaking that it'd probably never be completed.

        I was hoping (without yet digging into the C source,) that it might be easy to use Notepad++ search and replace to stick "W" where they need to be.
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        Re: PCFileTools

        Postby thomthom » Mon Feb 06, 2012 4:43 pm

        Dan Rathbun wrote:
        thomthom wrote:Trying to rewrite the entire File, Dir and IO classes to call the W variant file function just seems like such a massive undertaking that it'd probably never be completed.

        I was hoping (without yet digging into the C source,) that it might be easy to use Notepad++ search and replace to stick "W" where they need to be.

        Don't think it's that easy. I think there's a few type definitions that also needs to be adjusted. And then you need to ensure that there's no hard coded struct or data type sizes used...
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        Re: [Code] PCFileTools

        Postby Dan Rathbun » Mon Feb 13, 2012 10:45 pm

        Poking around, finding links to help Adam on his Hbrew webdialog problem, I ran across a link on the Wikipedia Windows Code Pages doc.

        Down at the bottom:
        See also


        AppLocale — a utility to run non-Unicode (code page-based) applications in a locale of the user's choice.
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