From: Luis Lavena <luislavena@...>
Date: 2010-12-13T05:25:19+09:00
Subject: Re: Chdir on Windows - beginner doubt

On Dec 12, 4:39 pm, "Marcelo S." <marc...@intelitexto.com> wrote:
> Folks,
>

Hello Marcelo,

> Hi, this is my first post here. Tried to search the forum for a specific
> answer, but didn't find it. I'm not a programmer, just a curious. Got
> Chris Pine's "Learning to Program", and I'm going through all the
> exercises. I'm in the YAML chapter now, and I'm trying to adapt the
> picture-renaming exercise.
>
> Somehow, though, my computer doesn't do the task. I'm not sure if the
> problem is in Chdir or in another instruction (or even in the addresses
> I gave).
>
> I use Windows Vista. These are the first two lines, where I use Dir:
>
> Dir.chdir ('D:\\Fotos')
> pic_names=Dir['C:\\Users\\Marcelo\\Pictures\\*.{JPG.jpg}']
>
> The double inverted slashes were put after I read something about this
> being the way Ruby gets the syntax in Windows.
>
> It says "Downloading 0 files: "

Download 0 files is part of the script, correct?

> And nothing else happens.

Perhaps the script is expecting a list of files and got none.

>
> What did I do wrong?
>

Nothing you did wrong, but Dir globing is expecting forward slashes
instead of backslashes.

Try, in a IRB prompt:

irb(main):001:0> Dir["C:\\Users\\Luis\\Pictures\\Avatars\\*.png"]
=> []

Got zero results, now with forward slashes:

irb(main):003:0> Dir["C:/Users/Luis/Pictures/Avatars/*.png"]
=> ["C:/Users/Luis/Pictures/Avatars/IMG_0231.png", "C:/Users/Luis/
Pictures/Avatars/IMG_0231_CROP (Custom).png", "C:/Users/Luis/Pictures/
Avatars/IMG_0231_CROP.png", "C:/Users/Luis/Pictures/Avatars/Logo
Multimedia systems.png"]

Got some results.

If the path you entered was from the command line or from a input,
then you can try do File.expand_path to transform the double
backslashes to forward slashes.

Hope that helps and welcome to Ruby!

--
Luis Lavena