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:

Communication between devices

OSR_Community_UserOSR_Community_User Member Posts: 110,217
I create two drivers and I dont know how to communicate beetween them from
DDK :IoCallDriver?


  • OSR_Community_UserOSR_Community_User Member Posts: 110,217
    Of course you can use IoCallDriver, but you can use too: direct calls
    (provided you know the address
    of the other driver functions ) and IOCTL calls.


    > -----Original Message-----
    > From: [email protected]
    > Sent: lunes 3 de abril de 2000 10:21
    > To: File Systems Developers
    > Subject: [ntfsd] Communication between devices
    > I create two drivers and I dont know how to communicate beetween them from
    > DDK :IoCallDriver?
    > ---
    > You are currently subscribed to ntfsd as: [email protected]
    > To unsubscribe send a blank email to $subst('Email.Unsub')
  • OSR_Community_UserOSR_Community_User Member Posts: 110,217
    Thanks Castillo
    But I still dont know how to send a message to a sys created by myself from
    another sys .How can you do that?When I try to get a deviceobject of my
    second sys I get STATUS_ACCES_DENIED.
Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

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!
Writing WDF Drivers 7 Dec 2020 LIVE ONLINE
Internals & Software Drivers 25 Jan 2021 LIVE ONLINE
Developing Minifilters 8 March 2021 LIVE ONLINE