Re: Identify USB Keyboard Device Instance For Each Character Dynam

Your guidance is highly appreciated. I look forward to trying this out.

"Doron Holan [MS]" wrote:

> look at the kbfiltr example in the DDK, your life will be much easier. you
> can easily hook into the scan code reporting mechanism by using the service
> callback as demonstrated in the sample. no irps, just an array of packets.
> from there you can decide which elements of the array you report up to the
> class driver.
>
> to determine which device you are filtering, in your AddDevice routine you
> run your algorithm. Typically this would be looking at a devnode registry
> key that your INF put down during installation that tells you the type of
> device. you store this value in the device extension of your devobj. in
> the callback routine, you are passed teh devobj, so it is a simple core at
> that point in time.
>
> finally, if you still have control of the hw, put the barcode stuff into a
> separate top level collection. that is the whole point of HID, you separate
> out different functions into separate pieces.
>
> d
>
> --
> Please do not send e-mail directly to this alias. this alias is for
> newsgroup purposes only.
> This posting is provided "AS IS" with no warranties, and confers no rights.
>
>
> "cdavis999" <cdavis999@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> news:141B0008-9679-441E-B434-69C77437D7FA@xxxxxxxxxxxxxxxx
> >I have two USB keyboard devices attached to my target WinXP/SP2 box. One
> > device is actually a USB barcode scanner that functions as a keyboard and
> > one
> > actually is a USB keyboard. My debugger output below shows the devstack
> > for
> > each device object under my kbdclass driver object. (The reason you see
> > the
> > SysInternals Ctrl2cap filter driver is because I'be been using the code in
> > the Ctrl2capReadComplete function to peek at the scan codes.)
> >
> > What I'm trying to understand is whether it is possible to
> > programmatically
> > distinguish the IRPs from the barcode scanner from the IRPs from the
> > actual
> > keyboard. I would like to intercept and redirect the barcode input before
> > it
> > passes into the Windows keyboard input processing and is tied to
> > interpretation as messages by a windows procedure with keyboard focus. So
> > I
> > need to evaluate the DO origin for each character.
> >
> > Can a specific (IRP that contains keystroke data) be associated somehow
> > with
> > the specific device object that originated it? (In my case, the
> > KeyboardClass2 DO with the Device Instance string
> > "HID\Vid_065a&Pid_0001\6&223cc4d1&0&0000" is my barcode scanner.)
> >
> > I would be grateful for any insight into possible approaches to solving
> > this
> > problem. I would also like to know it's infeasible or crazy. Also, as a
> > newcomer to driver development I would appreciate any correction to any
> > obvious misunderstandings on my part.
> >
> > Thanks very much!
> >
> > Debugger Output:
> >
> > kd> !drvobj kbdclass
> > Driver object (866fd5e8) is for:
> > \Driver\Kbdclass
> > Driver Extension List: (id , addr)
> >
> > Device Object list:
> > 860a5030 86697030 866fe030
> >
> > kd> !devstack 860a5030
> > !DevObj !DrvObj !DevExt ObjectName
> > 8621d020 \Driver\Ctrl2cap 8621d0d8
> >> 860a5030 \Driver\Kbdclass 860a50e8 KeyboardClass2
> > 86535020 \Driver\kbdhid 865350d8
> > 864e20f8 \Driver\hidusb 864e21b0 0000005d
> > !DevNode 86699518 :
> > DeviceInst is "HID\Vid_065a&Pid_0001\6&223cc4d1&0&0000"
> > ServiceName is "kbdhid"
> >
> > kd> !devstack 86697030
> > !DevObj !DrvObj !DevExt ObjectName
> > 86277020 \Driver\Ctrl2cap 862770d8
> >> 86697030 \Driver\Kbdclass 866970e8 KeyboardClass1
> > 864e75a8 \Driver\kbdhid 864e7660
> > 86792920 \Driver\hidusb 867929d8 0000005b
> > !DevNode 86276468 :
> > DeviceInst is "HID\Vid_413c&Pid_2003\6&15c34ccb&0&0000"
> > ServiceName is "kbdhid"
> >
> >
>
>
>
.

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