problems using CreateFile

NTDEV
1

Hi everybody, and sorry for troubling you with
newbies questions, but I have a problem with CreateFile
that I just can’t figure out:

I have a driver, to which I want to connect from my application,
using CreateFile(), and I have 2 processes that try to
attach to the driver.

The first succeeds, and the second fails with error code #2
(ERROR_FILE_NOT_FOUND).

The CreateFile line is this:
CreateFile(SymbolicLinkName,
GENERIC_WRITE | GENERIC_READ,
0,
NULL,
CREATE_ALWAYS,
FILE_FLAG_OVERLAPPED,0);

My guess is that it’s something with the flags, but I don’t seem
to find the correct flag…

thanks in advance,

  • Barak

–

Barak Mandelovich Mercury Interactive ltd.
xxxxx@conduct.com 19 Shabazi st.
Tel: +972 3 539 9286 Yehud, 56100
Fax: +972 3 533 1617 Israel

2

When you called IoCreateDevice in the DriverEntry, how did you set the
Exclusive parameter? To allow multiple processes access, you must set it to
FALSE.

Gary

-----Original Message-----
From: Barak Mandelovich [mailto:xxxxx@conduct.com]
Sent: Tuesday, March 21, 2000 4:44 AM
To: NT Developers Interest List
Subject: [ntdev] problems using CreateFile

I have a driver, to which I want to connect from my application,
using CreateFile(), and I have 2 processes that try to
attach to the driver.

The first succeeds, and the second fails with error code #2
(ERROR_FILE_NOT_FOUND).

3

Hmm, but should setting exclusive == TRUE cause ERROR_FILE_NOT_FOUND to be
returned to the second process? I would have though ERROR_ACCESS_DENIED
would be returned in that case.

  • Matt

From: “Gary Little”
Sent: Tuesday, March 21, 2000 11:09 AM

> When you called IoCreateDevice in the DriverEntry, how did you set the
> Exclusive parameter? To allow multiple processes access, you must set it
to
> FALSE.

[snip]

> From: Barak Mandelovich [mailto:xxxxx@conduct.com]
> To: NT Developers Interest List
>
> > I have a driver, to which I want to connect from my application,
> > using CreateFile(), and I have 2 processes that try to
> > attach to the driver.
> >
> > The first succeeds, and the second fails with error code #2
> > (ERROR_FILE_NOT_FOUND).

[snip]

4

Have you verified that the value of SymbolicLinkName is identical in both
cases ?

You’ll also need to set FILE_SHARE READ | FILE_SHARE_WRITE to the 3rd
parameter of CreateFile.

As previously pointed out, you’ll need to set the Exclusive bit to FALSE
when calling IoCreateDevice().

Regards,

Paul Bunn, UltraBac.Com, 425-644-6000
Microsoft MVP - WindowsNT
http://www.ultrabac.com

-----Original Message-----
From: Barak Mandelovich [mailto:xxxxx@conduct.com]
Sent: Tuesday, March 21, 2000 4:44 AM
To: NT Developers Interest List
Subject: [ntdev] problems using CreateFile

Hi everybody, and sorry for troubling you with
newbies questions, but I have a problem with CreateFile
that I just can’t figure out:

I have a driver, to which I want to connect from my application,
using CreateFile(), and I have 2 processes that try to
attach to the driver.

The first succeeds, and the second fails with error code #2
(ERROR_FILE_NOT_FOUND).

The CreateFile line is this:
CreateFile(SymbolicLinkName,
GENERIC_WRITE | GENERIC_READ,
0,
NULL,
CREATE_ALWAYS,
FILE_FLAG_OVERLAPPED,0);

My guess is that it’s something with the flags, but I don’t seem
to find the correct flag…

5

> My guess is that it’s something with the flags, but I don’t seem

to find the correct flag…

Maybe not. The symlink name is
\.\name
where “name” is what will go after "??" in kernel mode.

Max

6

Maby you need use NtCreateFile instead CreateFIle?
Regards
Mark
Paul Bunn wrote:

Have you verified that the value of SymbolicLinkName is identical in both
cases ?

You’ll also need to set FILE_SHARE READ | FILE_SHARE_WRITE to the 3rd
parameter of CreateFile.

As previously pointed out, you’ll need to set the Exclusive bit to FALSE
when calling IoCreateDevice().

Regards,

Paul Bunn, UltraBac.Com, 425-644-6000
Microsoft MVP - WindowsNT
http://www.ultrabac.com

-----Original Message-----
From: Barak Mandelovich [mailto:xxxxx@conduct.com]
Sent: Tuesday, March 21, 2000 4:44 AM
To: NT Developers Interest List
Subject: [ntdev] problems using CreateFile

Hi everybody, and sorry for troubling you with
newbies questions, but I have a problem with CreateFile
that I just can’t figure out:

I have a driver, to which I want to connect from my application,
using CreateFile(), and I have 2 processes that try to
attach to the driver.

The first succeeds, and the second fails with error code #2
(ERROR_FILE_NOT_FOUND).

The CreateFile line is this:
CreateFile(SymbolicLinkName,
GENERIC_WRITE | GENERIC_READ,
0,
NULL,
CREATE_ALWAYS,
FILE_FLAG_OVERLAPPED,0);

My guess is that it’s something with the flags, but I don’t seem
to find the correct flag…

You are currently subscribed to ntdev as: xxxxx@arx.com
To unsubscribe send a blank email to $subst(‘Email.Unsub’)