check for a CD

[Derek Bump]

Hello Chris,

My solution to the same problem is to check for a volume serial number 
first, then if there is one, check for the file I'm looking for.  You 
can do this with the following function...

function GetVolumeSN pDiskLetter
   local volumeSerialNumber
   -- Supports both "C", "C:" and "C:\" styles
   put char 1 of pDiskLetter & ":" into pDisk
   set the hideConsoleWindows to true
   put shell("dir " & pDisk) into tDirData
   get matchText(tDirData,"Volume Serial Number is 
(.*)\n",volumeSerialNumber)
   if it is true then
     return volumeSerialNumber
   else
     return empty
   end if
end GetVolumeSN

If the function returns a Serial Number, I know a disk is located at 
that drive letter.  I then do my "if there is a file..." stuff.  If the 
function returns nothing (empty) then I know there is no disk in the 
drive and I don't check it.

This seems to avoid the whole "no disc" error in Windows XP SP2.  I 
don't know about other versions... you'll have to test it out.

I hope that helps!


Derek Bump
Dreamscape Software
http://www.dreamscapesoftware.com

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Chris Sheffield wrote:
> I would think this has to be a common problem, so I'm wondering how the 
> rest of you have gotten around it.
> 
> The single-user version of our software comes with media content on a 
> series of CDs. Things have been working pretty well, except in a case 
> where a user might have more than one CD drive (we're talking Windows 
> only here). I have written a routine that scans through each available 
> drive looking for our CD. The problem is, if there is no CD in the 
> drive(s) at all, a "no disk" error, generated by Windows, pops up. This 
> error will appear for each drive that does not have a CD in it. My 
> question is, is there some way to suppress this error? I'm simply using 
> a "if there is a file" type of check to determine if our CD is in one of 
> the drives. Is there some other method available to me? A command line 
> utility perhaps?
> 
> Any suggestions would be appreciated.
> 
> Thanks,
> Chris
> 
> 
> -- 
> Chris Sheffield
> Read Naturally, Inc.
> www.readnaturally.com
> 
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