Best way to send data to a user mode app from a filter drive

NTDEV
1

Hi,

I was wondering what is the fastest and most reliable method to send data from a keyboard filter to a user app. I want to send the key pressed to a user app which will then process it. I believe that a PnP style notification is not possible on a filter, which would meet the fast & reliable requirements. Any ideas?

-Mrutyunjaya

2

Use reverse ioctl method. You can search this list to get more than enough
information to help you.

On Sat, Jul 28, 2018 at 5:14 PM xxxxx@hotmail.com <
xxxxx@lists.osr.com> wrote:

Hi,

I was wondering what is the fastest and most reliable method to send data
from a keyboard filter to a user app. I want to send the key pressed to a
user app which will then process it. I believe that a PnP style
notification is not possible on a filter, which would meet the fast &
reliable requirements. Any ideas?

-Mrutyunjaya

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3

What is a ?name pnp style notification ?? A filter on the keyboard stack is pnp, otherwise you would not be inserted into the right stack location.

d

Bent from my phone

From: 30211654500n behalf of
Sent: Saturday, July 28, 2018 2:14 PM
To: Windows System Software Devs Interest List
Subject: [ntdev] Best way to send data to a user mode app from a filter drive

Hi,

I was wondering what is the fastest and most reliable method to send data from a keyboard filter to a user app. I want to send the key pressed to a user app which will then process it. I believe that a PnP style notification is not possible on a filter, which would meet the fast & reliable requirements. Any ideas?

-Mrutyunjaya

NTDEV is sponsored by OSR

Visit the list online at: https:

MONTHLY seminars on crash dump analysis, WDF, Windows internals and software drivers!
Details at https:

To unsubscribe, visit the List Server section of OSR Online at https:</https:></https:></https:>

4

How can I send data from a keyboard filter to a user app ?

-Mrutyunjaya

5

https://github.com/Microsoft/Windows-driver-samples/tree/master/input/kbfiltr

the kbfiltr sample shows how to create a raw PDO which enables UM communication.

d

-----Original Message-----
From: xxxxx@lists.osr.com On Behalf Of xxxxx@hotmail.com
Sent: Monday, July 30, 2018 11:32 AM
To: Windows System Software Devs Interest List
Subject: RE:[ntdev] Best way to send data to a user mode app from a filter drive

How can I send data from a keyboard filter to a user app ?

-Mrutyunjaya

—
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