Windows System Software -- Consulting, Training, Development -- Unique Expertise, Guaranteed Results


Before Posting...

Please check out the Community Guidelines in the Announcements and Administration Category.

More Info on Driver Writing and Debugging

The free OSR Learning Library has more than 50 articles on a wide variety of topics about writing and debugging device drivers and Minifilters. From introductory level to advanced. All the articles have been recently reviewed and updated, and are written using the clear and definitive style you've come to expect from OSR over the years.

Check out The OSR Learning Library at:

Retrieving PFLT_CONTEXT n minifilter driver

parsaparsa Member Posts: 67
edited November 2021 in NTFSD

Hi All,

I am working on a FS minifilter driver. From the MSDN, it seems the FLT_INSTANCE object in only available in the FS callback routines registered in the structure

UCHAR MajorFunction;
PVOID Reserved1;

Is there anyway to access the FLT_INSTANCE apart from the FS callback routines. For example, when I attach a context to the FLT_INSTANCE using FltSetInstanceContext in one of the FS callback and if I want to retrieve the context in some of the driver IOCTL function using FltGetInstanceContext.


Post edited by Dan_Root on


Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. Sign in or register to get started.

Upcoming OSR Seminars
OSR has suspended in-person seminars due to the Covid-19 outbreak. But, don't miss your training! Attend via the internet instead!
Internals & Software Drivers 7 February 2022 Live, Online
Kernel Debugging 21 March 2022 Live, Online
Developing Minifilters 23 May 2022 Live, Online
Writing WDF Drivers 12 September 2022 Live, Online