IOCTL use in minidrivers

NTDEV
1

Hi all,
I’m writing a WDM streaming video minidriver. It reads isochronous data
from a proprietary piece of hardware on the IEEE-1394 bus.
However…I would like to be able to make IOCTL calls into my driver from
an application. I have spent almost a whole week on this problem, and I’m
not making much progress.
For a non-PnP driver, I assume that I’d need to call IoCreateDevice() and
IoCreateSymbolicLink(). But what about PnP?
Anyone care to shed some light on this for me before I go completely insane?
Jayalakshmi

2

HI,

If u can manage to read the book, "programming the Microsoft windows driver model" by walter oney, u can solve the problem..

in pnp driver, u will have to initialise the AddDevice funtion pointer in the driver entry function , the Pnp manager will later call, the adddevice function, and inside it, u create the device object using the IoCreateDevice.

in PnP u can use GUID Device interface to represent the device..

Visit this page to get some sample wdm pci driver...with respect to pnp and your question, i think the sample should give u some better idea..

wdm pci sample V1.4 from
http://www.osr.com/resources_downloads.shtml

regards,

Shiva P

----- Original Message -----
From: Jayalakshmi
To: NT Developers Interest List
Sent: Sunday, March 23, 2003 10:49 AM
Subject: [ntdev] IOCTL use in minidrivers

Hi all,
I'm writing a WDM streaming video minidriver. It reads isochronous data
from a proprietary piece of hardware on the IEEE-1394 bus.
However....I would like to be able to make IOCTL calls into my driver from
an application. I have spent almost a whole week on this problem, and I'm
not making much progress.
For a non-PnP driver, I assume that I'd need to call IoCreateDevice() and
IoCreateSymbolicLink(). But what about PnP?
Anyone care to shed some light on this for me before I go completely insane?
Jayalakshmi

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3

Stream class calls IoRegisterDeviceInterfaces once per an entry that minidriver specifies in the
list (array) of categories where it wants to show itself up.

It does not call IoCreateSymbolicLink and IIRC it creates unnamed device object.

Look at AmCap sample in Platform SDK to see how to use system device enumerator to find your
driver and talk to it from the user mode.

– Max.

— Jayalakshmi wrote:
> Hi all,
> I’m writing a WDM streaming video minidriver. It reads isochronous data
> from a proprietary piece of hardware on the IEEE-1394 bus.
> However…I would like to be able to make IOCTL calls into my driver from
> an application. I have spent almost a whole week on this problem, and I’m
> not making much progress.
> For a non-PnP driver, I assume that I’d need to call IoCreateDevice() and
> IoCreateSymbolicLink(). But what about PnP?
> Anyone care to shed some light on this for me before I go completely insane?
> Jayalakshmi
>
>
>
> —
> You are currently subscribed to ntdev as: xxxxx@yahoo.com
> To unsubscribe send a blank email to xxxxx@lists.osr.com
>

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