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problems using CreateFile

OSR_Community_UserOSR_Community_User Member Posts: 110,217
in NTDEV
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.
[email protected] 19 Shabazi st.
Tel: +972 3 539 9286 Yehud, 56100
Fax: +972 3 533 1617 Israel
----------------------------------------------------
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Comments

  • OSR_Community_UserOSR_Community_User Member Posts: 110,217
    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:[email protected]]
    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).
    · Share on Facebook
  • OSR_Community_UserOSR_Community_User Member Posts: 110,217
    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" <[email protected]>
    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:[email protected]]
    > 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]
    · Share on Facebook
  • Paul_BunnPaul_Bunn Member Posts: 251
    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:[email protected]]
    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....
    · Share on Facebook
  • OSR_Community_UserOSR_Community_User Member Posts: 110,217
    > 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
    · Share on Facebook
  • Mark_ShnaiderMark_Shnaider Member Posts: 95
    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:[email protected]]
    > 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: [email protected]
    > To unsubscribe send a blank email to $subst('Email.Unsub')
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