ZwOpenKey fails in USB driver

NTDEV
1

Hi All,
I am developing a USB function driver and using the
ZwOpenKey() function to read some registry values. All
these functions working fine after windows is loaded.
But when I restart the system with my USB device
plugged in, reading of registry fails when my driver
loaded. I know this is because the registry is not
ready to access when my driver is loaded.

1)So I think I need to change the load order of my
driver. I would like to know what the safe load order
for my USB function driver in order to access the
registry at boot time. ?
2)How I can specify this boot order in my INF file?

Thanks in adavnce
Suja

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2

Move all your registry values to SYSTEM hive. Drivers must not access other
hives.

Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
xxxxx@storagecraft.com
http://www.storagecraft.com

----- Original Message -----
From: “SUJA JAMES”
To: “Windows System Software Devs Interest List”
Sent: Sunday, May 23, 2004 7:10 AM
Subject: [ntdev] ZwOpenKey fails in USB driver

> Hi All,
> I am developing a USB function driver and using the
> ZwOpenKey() function to read some registry values. All
> these functions working fine after windows is loaded.
> But when I restart the system with my USB device
> plugged in, reading of registry fails when my driver
> loaded. I know this is because the registry is not
> ready to access when my driver is loaded.
>
> 1)So I think I need to change the load order of my
> driver. I would like to know what the safe load order
> for my USB function driver in order to access the
> registry at boot time. ?
> 2)How I can specify this boot order in my INF file?
>
> Thanks in adavnce
> Suja
>
>
>
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Domains - Claim yours for only $14.70/year
> http://smallbusiness.promotions.yahoo.com/offer
>
> —
> Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256
>
> You are currently subscribed to ntdev as: xxxxx@storagecraft.com
> To unsubscribe send a blank email to xxxxx@lists.osr.com

3

“SUJA JAMES” wrote in message news:xxxxx@ntdev…
> Hi All,
> I am developing a USB function driver and using the
> ZwOpenKey() function to read some registry values. All
> these functions working fine after windows is loaded.
> But when I restart the system with my USB device
> plugged in, reading of registry fails when my driver
> loaded. I know this is because the registry is not
> ready to access when my driver is loaded.
>
> 1)So I think I need to change the load order of my
> driver. I would like to know what the safe load order
> for my USB function driver in order to access the
> registry at boot time. ?
> 2)How I can specify this boot order in my INF file?
>
> Thanks in adavnce
> Suja
–
You can try to register and use Reinitialize routine for reading values from
the registry (see functions IoRegisterDriverReinitialization and
IoRegisterBootDriverReinitialization in DDK).

Regards,
Gennady Mayko.

4

The callback function you register in these routines is called well
before the rest of the registry is loaded. They will not help you.

d

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Gennady Mayko
Sent: Sunday, May 23, 2004 8:47 AM
To: Windows System Software Devs Interest List
Subject: Re:[ntdev] ZwOpenKey fails in USB driver

“SUJA JAMES” wrote in message
news:xxxxx@ntdev…
> Hi All,
> I am developing a USB function driver and using the
> ZwOpenKey() function to read some registry values. All
> these functions working fine after windows is loaded.
> But when I restart the system with my USB device
> plugged in, reading of registry fails when my driver
> loaded. I know this is because the registry is not
> ready to access when my driver is loaded.
>
> 1)So I think I need to change the load order of my
> driver. I would like to know what the safe load order
> for my USB function driver in order to access the
> registry at boot time. ?
> 2)How I can specify this boot order in my INF file?
>
> Thanks in adavnce
> Suja
–
You can try to register and use Reinitialize routine for reading values
from
the registry (see functions IoRegisterDriverReinitialization and
IoRegisterBootDriverReinitialization in DDK).

Regards,
Gennady Mayko.

—
Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256

You are currently subscribed to ntdev as: xxxxx@windows.microsoft.com
To unsubscribe send a blank email to xxxxx@lists.osr.com