How to use SymbolicLinkName (newbie que)

NTDEV
1

Hello,

I am writing a keyboard upper filter driver on Windows XP. I call
IoRegisterDeviceInterface() in AddDevice() routine to get a SymbolicLinkName
and then call IoSetDeviceInterfaceState() when handle IRP_MN_START_DEVICE in
DispatchPnP routine just as instructed in DDK.

I locate the SymbolicLinkName in registry, then I try to use a user-mode
application to get a device handle to this device object. I call

hDevice=CreateFile(“\\?\ACPI#PNP0303#4&61f3b4b&0#{884b96c3-56ef-11d1-bc8c-00a0c91405dd}”,
GENERIC_WRITE | GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);

but the returned hDevice is invalid and GetLastError() return 0x5 which
means “Access is denied”. I don’t know why this happens - I am running in
the Administrator account. I hope someone can help me. thanks in advance.

2

The keyboard (and mouse for that matter) are opened with exclusive
access by the raw input thread. To communicate with your filter, you
need to create a control device on the side.

Read the following kb article on how to do this:

http://support.microsoft.com/default.aspx?scid=kb;en-us;Q262305

d

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Chong
Sent: Saturday, January 01, 2005 10:50 AM
To: Windows System Software Devs Interest List
Subject: [ntdev] How to use SymbolicLinkName (newbie que)

Hello,

I am writing a keyboard upper filter driver on Windows XP. I call
IoRegisterDeviceInterface() in AddDevice() routine to get a
SymbolicLinkName
and then call IoSetDeviceInterfaceState() when handle
IRP_MN_START_DEVICE in
DispatchPnP routine just as instructed in DDK.

I locate the SymbolicLinkName in registry, then I try to use a
user-mode
application to get a device handle to this device object. I call

hDevice=CreateFile(“\\?\ACPI#PNP0303#4&61f3b4b&0#{884b96c3-56ef-11d1-
bc8c-00a0c91405dd}”,
GENERIC_WRITE | GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);

but the returned hDevice is invalid and GetLastError() return 0x5 which
means “Access is denied”. I don’t know why this happens - I am running
in
the Administrator account. I hope someone can help me. thanks in
advance.

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

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