[Win32utils-devel] win32-dir broken (and windows-pr's limits.rb issues warnings) in ruby 1.9

Kendall Gifford zettabyte at gmail.com
Tue Feb 2 14:39:23 EST 2010


Hi everyone, I'm pretty new to the win32-utils project: looks pretty cool!

Anyhow, for my development I'm using ruby 1.9.1 (p243) on Windows XP
Pro, SP3 (I download the ruby installer project's zip and development
kit).

I installed the win32-dir gem (which pulled in windows-pr too) and I'm
trying to use a few of the constants it adds to the Dir class.
However, on my first try on a very simple program, I got and error. I
then literally simplified my test script to:

---- D:\dir_test.rb
# Test win32-dir gem...
require 'win32/dir'
#
# just see if the parser can handle this gem at all; no actual code in file...
#
----

executing this yielded the following error and warning:

D:\>ruby dir_test.rb
D:/ruby/lib/ruby/gems/1.9.1/gems/windows-pr-1.0.8/lib/windows/limits.rb:17:
warning: variable $KCODE is no longer effective
D:/ruby/lib/ruby/gems/1.9.1/gems/win32-dir-0.3.5/lib/win32/dir.rb:38:in
`block in <class:Dir>': undefined method `split' for
:CSIDL_DESKTOP:Symbol (NoMethodError)
    from D:/ruby/lib/ruby/gems/1.9.1/gems/win32-dir-0.3.5/lib/win32/dir.rb:36:in
`each'
    from D:/ruby/lib/ruby/gems/1.9.1/gems/win32-dir-0.3.5/lib/win32/dir.rb:36:in
`<class:Dir>'
    from D:/ruby/lib/ruby/gems/1.9.1/gems/win32-dir-0.3.5/lib/win32/dir.rb:13:in
`<top (required)>'
    from dir_test.rb:2:in `require'
    from dir_test.rb:2:in `<main>'

The error in win32-dir's dir.rb file was an easy fix. I just changed:
dir.rb:38:      nconst = constant.split('CSIDL_').last
to:
dir.rb:38:      nconst = constant.to_s.split('CSIDL_').last

This makes the extra to_s redundant in ruby 1.8 but is needed for 1.9.
However, the $KCODE warning from above isn't as simple for me. I see
what the problem is, windows-pr gem's limits.rb file (line 17 on gem
version 1.0.8) uses $KCODE in a condition. The idea is to have a
larger value set for MAXPATH if using 'UTF8' encoding, otherwise set
MAXPATH to 256. Since $KCODE isn't used in 1.9 it is (I'm guessing)
nil (at least in my case) so it will always issue the warning and set
MAXPATH to 256.

Now, my simple code will likely still work but I'd like to resolve the
warning (I'm OCD) and have it work the "right" way for 1.8 <---> 1.9
compatibility. So, I guess this is a "feature request" as it were.

So, is Window's MAXPATH constant based on whether you use the ANSI vs.
their UNICODE version of an API call generally or is it more
complicated than that? Do win32-utils delegate to the ANSI ("A") or
UNICODE ("W") version of an API call based on the $KCODE value
globally? I'll dig into some code and try to answer my own question
but, if someone just knows this stuff well off the top of their head,
I'd appreciate the help. I've done a fair amount of C-based Win32
coding in the past and would like to help with these various projects
(to do my part); especially to get everything working smoothly on 1.9.

Anyhow, thanks everyone for your hard work making these gems!

-- 
Kendall Gifford
zettabyte at gmail.com


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