Finding USB volumes on Win

[Scott Morrow]

Richard,

Thanks for sharing this work!  When testing it in OSX I needed to add a line:

 replace "%20" with space in tMountPoint

           before the line

 set the directory to tMountPoint


Scott Morrow

Elementary Software
(Now with 20% less chalk dust!)
web       http://elementarysoftware.com/
email     scott at elementarysoftware.com



On Mar 23, 2010, at 6:13 AM, Richard Gaskin wrote:

> Kay C Lan wrote:
> 
>> On Mon, Mar 22, 2010 at 10:05 PM, Richard Gaskin wrote:
>>> In January with the help of Phil, Peter, and others I got some great tips
>>> for identifying removable drives on OS X and Linux.  But I'm having
>>> difficulty figuring out how to do the same in Windows.
>> 
>> Richard,
>> 
>> back then you wrote:
>> 
>> In the meantime, it looks like I have some parsing to do and some homework
>>> to figure out the details of getting this info for Win Vista, Win 7, and
>>> Linux.  I'll post the result here once I get it working.
>> 
>> I'm hoping that offer still applies?
> 
> Absolutely.  This has been a group effort, with valuable input from Ken Ray, Phil Davis, Peter Alcibiades, Matthias Rebbe, and others, so the least I can do is share the fruit of our collective labor.
> 
> Below is a handler that handles Mac and Win, with a placeholder for Linux but I don't need that yet so I'll write it in a few weeks when I get to it.
> 
> It examines the currently-mounted volumes and returns a list of those volumes which are removable, using AppleScript for the Mac side and data from the Win registry for Windows.
> 
> Each line of the return value has three items separated by tabs:
> 
> - Drive label/letter (I use this to display in a list)
> - available space (useful for my installer)
> - mount point or drive letter (needed for writing to the drive)
> 
> I have four different removable drives I've been testing with (card reader, U3, plain USB flash drive, and camera), and the AppleScript method that was suggested here was the only one which easily recognized my card reader along with all the other more "normal" drives; relying on info from system_profiler alone did not provide the mount point, needed to write files to the drive.
> 
> Note that U3 drives show up as two volumes, one writable and one not. The non-writable volume of a U3 drive has zero available space, and that's used to exclude them from the list without having to slow things down by attempting writes to each disk to test that (though also do that on the selected volume later on in a different handler just to make sure before proceeding with the install).
> 
> This is a bit sloppy in some parts since it's a small part of a larger project in which there's a LOT of work do to, but it seems to get the job done well enough for now (you may need to clean up email-imposed line wraps):
> 
> 
> 
> function RemovableDrives
>  -- Returns a tab-delimited list of drives which are removable
>  -- and have a file system usable by the current OS
>  -- in which each line is:
>  -- <Drive name/letter> <tab> <free space> <tab> <mountpoint/drive letter>
>  --
>  put the volumes into tVols
>  put empty into tRemVols
>  put the directory into tSaveDir
>  switch the platform
>  case "MacOS"
>    repeat for each line tVol in tVols
>      put "tell application "&quote&"Finder"&quote&cr&\
>          "properties of disk "&quote& tVol &quote &cr&\
>          "end tell" into tAS
>      do tAS as applescript
>      put the result into tInfo
>      if (", ejectable:true," is in tInfo) \
>          AND (", free space:0, " is not in tInfo) then
>        put offset(", URL:"&quote&"file://", tInfo) into tOS
>        delete char 1 to (tOS+13) of tInfo
>        set the itemdel to "/"
>        delete item 1 of tInfo
>        put "/"&word 1 of tInfo into tMountPoint
>        delete char -3 to -1 of tMountPoint
>        set the directory to tMountPoint
>        if the result is not empty then next repeat
>        put the diskspace into tSpace
>        put tVol &tab& tSpace &tab&  tMountPoint &cr after tRemVols
>      end if
>    end repeat
>    break
>  case "Win32"
>    set cursor to watch
>    put the hideConsoleWindows into tSaveHCW
>    set the hideConsoleWindows to true
>    -- Hex for "\??\STORAGE#RemovableMedia#":
>    put "5C003F003F005C00530054004F0052004100470045002300520065006D006F00760061006200"&\
>        "6C0065004D00650064006900610023" into tRemovableIdentifier
>    repeat for each line tVol in tVols
>      if tVol is in "A:B:C:" then next repeat -- two floppies and the main HD
>      put "reg query HKLM\SYSTEM\MountedDevices /v \DosDevices\"& tVol into tCmd
>      put shell(tCmd) into tmp
>      if tRemovableIdentifier is in line -2 of tmp then
>        set the directory to tVol
>        if the result is empty then
>          put "Removable Disk ("&tVol&")" &tab& the diskspace & tab& tVol &cr after tRemVols
>        end if
>      end if
>    end repeat
>    set the directory to tSaveDir
>    set the hideConsoleWindows to tSaveHCW
>    break
>  case "Linux"
>    -- add here -- http://linux.die.net/man/8/blkid -- thanks Peter!
> 
>    break
>  end switch
>  --
>  delete last char of tRemVols -- trailing CR
>  return tRemVols
> end RemovableDrives
> 
> 
> If you find any bugs with this please let me know.  I'll be putting it into testing with my own users soon, but it would of course be good to iron out as many issues as possible in advance.  Thanks -
> 
> --
> Richard Gaskin
> Fourth World
> Rev training and consulting: http://www.fourthworld.com
> Webzine for Rev developers: http://www.revjournal.com
> revJournal blog: http://revjournal.com/blog.irv
> _______________________________________________
> use-revolution mailing list
> use-revolution at lists.runrev.com
> Please visit this url to subscribe, unsubscribe and manage your subscription preferences:
> http://lists.runrev.com/mailman/listinfo/use-revolution