Re: can't delete USB registry items...

From: Daniel Miller (gorlash_at_community.nospam)
Date: 02/22/05 

Date: Tue, 22 Feb 2005 15:04:27 -0800

Right... I used SHDeleteKey on the top-level key, and and I used
RegDeleteKey recursively. They both failed, in the manner that I
described in my message below.

            Dan

"cristalink" <cristalink@nospam.nospam> wrote in
news:OxurjFTGFHA.2156@TK2MSFTNGP09.phx.gbl:

>> I've found that reg.exe can even delete these items, at least once
>> I've changed the permissions for Everyone; is there some way I can
>> either get source code for reg.exe, or at least find out how it is
>> doing this??
>
> RegDeleteKey cannot delete a key with subkeys. Try SHDeleteKey instead
> or call RegDeleteKey recursively.
> 

-- 
http://www.firestreamer.com - NTBackup to DVD and DV
"Daniel Miller" <gorlash@community.nospam> wrote in message 
news:Xns960595E7EDB68dancarddupercom@207.46.248.16...
>I suspect that this is not quite the correct group for this question.
> Unfortunately, it is the only MSDN Managed group which is related to
> the DDK, so I'm stuck here; I hope someone from MS will assist me.
>
> My specific issue that I have is this: we have a USB tester which can
> operate on 12 USB devices at a time.  Typically the user will start
> with a raw part which will have vendor/product ID, but no other
> internal data. They then perform a low-level format on the part, which
> assigns a device serial number and other SCSI data.  The problem is
> this: 
>
> Every time a USB device is inserted in a Windows machine, several
> registry entries are created... at a minimum, there are:
>
> HLKM:SYSTEM\CurrentControlSet\Enum\USB entries
> HLKM:SYSTEM\CurrentControlSet\Enum\USBSTOR entries
> HLKM:SYSTEM\CurrentControlSet\Control\DeviceClasses\{deviceClassGUID}
> entries
>
> and several others.  Each of these is hundreds of bytes in size.
>
> This will create one set of data before the low-level format, and
> *another* full set after the format, because the device now is
> recognized by its serial number instead of its physical address.
>
> Now, this is all just for ONE device.  In a fully-operational
> production environment, the user can put 15000 parts/day through the
> machine. 
>
> Just think of what the registry will look like after a week or two of
> this, let alone a couple of years... the machine quickly starts
> slowing down, and we know that eventually, when the registry gets too
> bloated, Windows just stops functioning.
>
> So I need to develop some method of stripping out old registry
> entries, once I manage to determine all of the entries that I need to
> be concerned about.  I tried doing this with the registry management
> functions, including either SHDeleteKey or RegDeleteKey, but I have
> two sets of problems with this; the first is permissions, the second
> is that even after I change the permissions, the delete-key functions
> still fail, though I can manually delete the keys using RegEdit.
>
> I've found that reg.exe can even delete these items, at least once
> I've changed the permissions for Everyone;  is there some way I can
> either get source code for reg.exe, or at least find out how it is
> doing this?? 
>
>    Dan Miller
>

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