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Both an upper and lower filter driver
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rjones872
Oct 7, 2009, 4:59:47 PM10/7/09
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If I want my single filter driver to be both an upper and lower class
filter driver, my AddDevice routine is called twice (once for the
lower filter, the second for the upper filter). What is the preferred
way in my driver to know when it attaches to the device stack, that my
device object is a lower class filter object or an upper class filter
object? Thanks.
filter driver, my AddDevice routine is called twice (once for the
lower filter, the second for the upper filter). What is the preferred
way in my driver to know when it attaches to the device stack, that my
device object is a lower class filter object or an upper class filter
object? Thanks.
Maxim S. Shatskih
Oct 7, 2009, 5:41:50 PM10/7/09
to
Addref the current top-of-stack (IoGetAttachedDeviceReference), then traverse the attachment chain from PDO up, and look at ->DriverObject values.
Then deref back.
--
Maxim S. Shatskih
Windows DDK MVP
ma...@storagecraft.com
http://www.storagecraft.com
"rjones872" <rjon...@gmail.com> wrote in message news:6a328cf7-f8bd-4f37...@13g2000prl.googlegroups.com...
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