From: Heesob Park <phasis@...>
Date: 2008-04-30T11:44:59+09:00
Subject: Re: How can I suppress popups on Windows during File.exists?

Hi,
Landon wrote:
> I apologize if this is a double post - I subscribed through the ruby-
> lang web page, but didn't get any email back, then sent mail to
> subscribe the manual way...same thing - no confirmation of response -
> then I emailed the post.
> 
> First, the real problem I'm trying to solve is the enumeration of all
> the valid drives on a Windows machine without ending up with windows
> popups flying.
> 
> Related to this objective, I need to do it in a way which is is most
> compatible with both pure ruby and JRuby in a single code base.
> Finally, this ruby code cannot be interactive or create an interactive
> situation...it has to run unattended.
> 
> What I'm finding is that on different windows machines, I'll get
> various kinds of popups depending upon whether the drive doesn't exist
> or has no media in it.
> 
> For example, on a windows machine with no floppy in the drive, if I go
> to irb and type:
> 
>> File.exists?("a:")
> 
> I will get a Windows popup that has the title:
> 
> Windows - No Disk
> 
> The contents of the popup says:  "Exception Processing Message
> c0000013 Parameters 75b6bf9c 4 75b6bf9c 75b6bf9c
> 
> If I cancel the popup, it comes back once more.  If I cancel it a 2nd
> time, it finally returns to Ruby and the irb prompt.
> 
> Second variation on the problem is if I try to access something on the
> CD-ROM assigned to D: but there is nothing in the D: drive.   Again,
> in irb, if I type:
> 
>> File.exists?("d:")
> 
> I will get a different kind of popup.  This one's title says "ruby.exe
> - No Disk" and the contents say "There is no disk in the drive. Please
> insert a disk into drive D:"
> 
> If I put a begin/rescue around the File.exists? call, rescue is never
> executed, so no exception is being thrown.
> 
> So, several questions come out of these experiments:
> 
> 1) Is there an alternate, standard way to enumerate drives on a
> windows machine using Ruby?
> 2) Is there a way to suppress these windows popups or alternatively
> have Ruby throw an exception in these cases?
> 3) any other ideas?
> 
> Any help on overcoming these issues in a standard, Ruby way would be
> very appreciated.
> 
Try with win32ole:

require 'win32ole'

drive_types = {
    0 => "Unknown type of drive",
    1 => "Removable drive",
    2 => "Fixed drive",
    3 => "Network drive",
    4 => "CD-ROM drive",
    5 => "RAM Disk"
}
oFS = WIN32OLE.new("Scripting.FileSystemObject")
oDrives = oFS.Drives
oDrives.each() do |x|
  puts "drive:#{x.DriveLetter}, type:#{drive_types[x.DriveType]}, 
ready:#{x.IsReady}"
end

Regards,

Park Heesob
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