Communication between user mode and kernel mode

NTDEV
1

Hello,everyone, now I have a question. I want to create an event to communicate with my WDM driver.
I want to create this event in my application which is running in user mode. In my application
I want to use WaitForSingleObject() function to wait for the event to be signaled. I hope that
this event can be signaled in my WDM driver. But how can I do this? How can I let the WDM driver
to signal the event in order to let the application continue to run?

I want to implement this kind of communication. Is my idea right?

Thank you very much.

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2

Hello,everyone, now I have a question. I want to create an event to communicate with my WDM driver.
I want to create this event in my application which is running in user mode. In my application
I want to use WaitForSingleObject() function to wait for the event to be signaled. I hope that
this event can be signaled in my WDM driver. But how can I do this? How can I let the WDM driver
to signal the event in order to let the application continue to run?

I want to implement this kind of communication. Is my idea right?

Thank you very much.
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3

Hi Michael,
You can sure do that. The siplest way is to use your custom IRP though.
If you insist on event then do the following:

  1. Create named event in your driver.
  2. Create named event in your app (the same name must be used).
  3. The CreateEvent in your app will fail with error object already exists.
  4. Read help on CreateEvent to get how you can obtain the event created in
    the driver.
    Hope this helps.
    Stas.
    -----Original Message-----
    From: xxxxx@lists.osr.com
    [mailto:xxxxx@lists.osr.com]On Behalf Of Michael Zhu
    Sent: Monday, May 28, 2001 7:41 AM
    To: NT Developers Interest List
    Subject: [ntdev] Communication between user mode and kernel mode

Hello,everyone, now I have a question. I want to create an event to
communicate with my WDM driver.
I want to create this event in my application which is running in user
mode. In my application
I want to use WaitForSingleObject() function to wait for the event to be
signaled. I hope that
this event can be signaled in my WDM driver. But how can I do this? How
can I let the WDM driver
to signal the event in order to let the application continue to run?

I want to implement this kind of communication. Is my idea right?

Thank you very much.

b­®¶¹®vµjjr™•:.žË›±Êâm?Ö›•©äzf¢–?y«Þž×^¿ûìùb²Û(²·(

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4

You needn¡¯t worry about events. You simply send the driver an IRP using
ReadFile, WriteFile, or define a control code for DeviceIoControl. The
driver either completes the IRP and returns it, or marks it as pending and
completes it when the IO associated with the IPR has completed. Your
application can block, waiting for the IRP to complete, or use
GetOverlappedResult to wait for the pending IRP. The latter assumes that you
told CreateFile to use OVERLAPPED IO.

Basically, what you want to do is how the system works.

Gary

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com]On Behalf Of Michael Zhu
Sent: Monday, May 28, 2001 7:41 AM
To: NT Developers Interest List
Subject: [ntdev] Communication between user mode and kernel mode

Hello,everyone, now I have a question. I want to create an event to
communicate with my WDM driver.
I want to create this event in my application which is running in user mode.
In my application
I want to use WaitForSingleObject() function to wait for the event to be
signaled. I hope that
this event can be signaled in my WDM driver. But how can I do this? How can
I let the WDM driver
to signal the event in order to let the application continue to run?

I want to implement this kind of communication. Is my idea right?

Thank you very much.

b‹š­ç.®·§¶\¬¹??Þv?µ×¯j?ŠÛeyºèi?¢·(?.žË›±Êâm?Ö›•©äzf¢–?y«Þž×^¿~w?b²Û(²·(

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5

http://support.microsoft.com/support/kb/articles/q228/7/85.asp

-----Original Message-----
From: Gary G. Little [mailto:xxxxx@inland.net]
Sent: Monday, May 28, 2001 8:41 AM
To: NT Developers Interest List
Subject: [ntdev] RE: Communication between user mode and kernel mode

You needn’t worry about events. You simply send the driver an IRP using
ReadFile, WriteFile, or define a control code for DeviceIoControl. The
driver either completes the IRP and returns it, or marks it as pending
and completes it when the IO associated with the IPR has completed. Your
application can block, waiting for the IRP to complete, or use
GetOverlappedResult to wait for the pending IRP. The latter assumes that
you told CreateFile to use OVERLAPPED IO.

Basically, what you want to do is how the system works.

Gary

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com]On Behalf Of Michael Zhu
Sent: Monday, May 28, 2001 7:41 AM
To: NT Developers Interest List
Subject: [ntdev] Communication between user mode and kernel mode

Hello,everyone, now I have a question. I want to create an event to
communicate with my WDM driver.

I want to create this event in my application which is running in user
mode. In my application

I want to use WaitForSingleObject() function to wait for the event to be
signaled. I hope that

this event can be signaled in my WDM driver. But how can I do this? How
can I let the WDM driver

to signal the event in order to let the application continue to run?

I want to implement this kind of communication. Is my idea right?

Thank you very much.

You are currently subscribed to ntdev as: xxxxx@microsoft.com
To unsubscribe send a blank email to xxxxx@lists.osr.com

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