How do I view the contents of WDFSTRING in WinDbg

NTDEV
1

I would like to view the contents of a WDFSTRING object in WinDbg. I can’t find a wdfkd command to display a string. I’ve tried !wdfobject, !wdfhandle, !wdfmemory and a few others. !wdfobject fails and !wdfhandle doesn’t help me get at a string. Does anyone know how I can find the actual unicode string?

2

!wdfhandle gives you the fx object type and underlying pointer. Once you have the underlying ptr,

dt FxString (pointer)

And one of the fields will be the UNICODE_STRING

d

Sent from my phone with no t9, all spilling mistakes are not intentional.

-----Original Message-----
From: xxxxx@xmission.com
Sent: Thursday, August 06, 2009 4:38 PM
To: Windows System Software Devs Interest List
Subject: [ntdev] How do I view the contents of WDFSTRING in WinDbg

I would like to view the contents of a WDFSTRING object in WinDbg. I can’t find a wdfkd command to display a string. I’ve tried !wdfobject, !wdfhandle, !wdfmemory and a few others. !wdfobject fails and !wdfhandle doesn’t help me get at a string. Does anyone know how I can find the actual unicode string?

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3

I didn’t get an underlying pointer. This is the output of the !wdfhandle command:

0: kd> !wdfkd.wdfhandle 0x77757d50

Dumping WDFHANDLE 0x77757d50

Handle type is WDFSTRING
Refcount: 1
Contexts:


Parent: !wdfhandle 7768db38, type is WDFDEVICE

!wdfobject 0x888a82a8

Should I get more than this. I’m doing this on Windows 7 build 7229 with kmdf from the 7127 WDK. Is this a problem?

4

The !wdfobject command that !wdfhandle gives you will give you the underlying type

d

Sent from my phone with no t9, all spilling mistakes are not intentional.

-----Original Message-----
From: xxxxx@xmission.com
Sent: Friday, August 07, 2009 7:34 AM
To: Windows System Software Devs Interest List
Subject: RE:[ntdev] How do I view the contents of WDFSTRING in WinDbg

I didn’t get an underlying pointer. This is the output of the !wdfhandle command:

0: kd> !wdfkd.wdfhandle 0x77757d50

Dumping WDFHANDLE 0x77757d50
=============================
Handle type is WDFSTRING
Refcount: 1
Contexts:


Parent: !wdfhandle 7768db38, type is WDFDEVICE

!wdfobject 0x888a82a8

Should I get more than this. I’m doing this on Windows 7 build 7229 with kmdf from the 7127 WDK. Is this a problem?

—
NTDEV is sponsored by OSR

For our schedule of WDF, WDM, debugging and other seminars visit:
http://www.osr.com/seminars

To unsubscribe, visit the List Server section of OSR Online at http://www.osronline.com/page.cfm?name=ListServer

5

Thanks Doron. I missed that part.