Read a file currently beeing used by a driver

Archived from groups: microsoft.public.development.device.drivers,microsoft.public.win32.programmer.kernel,microsoft.public.windowsxp.device_driver.dev (More info?)

I have a vague memory that the last time I looked into this I ultimately
discovered that Notepad wasn't opening the file for SHARE access, so it
was failing because it couldn't get exclusive access... but this was a
long time ago, so my memory could be faulty.

I do remember writing my own app that opens the file "the right way" and
getting it to work...

Thomas Johansen wrote:
> Hi
>
> In my driver, I do log some data in af file on the harddrive. It would be
> nice to read the file with notepad, will the driver still is running and
> using the file.
> I do have some problems doing this.
>
> This is what I would like to do:
> Read the file in eg. Notepad, while the driver stilling using the file
> If the file allready exits, the driver opens the file, and append anything
> new to it.
>
> This is how I open the file in the driver
>
> // Create the file
> status = ZwCreateFile( &hLogFile,
> SYNCHRONIZE,
> &objectAttributes,
> &IoStatus,
> 0,
> FILE_ATTRIBUTE_NORMAL,
> FILE_SHARE_WRITE | FILE_SHARE_WRITE,
> FILE_OPEN_IF,
> FILE_SYNCHRONOUS_IO_NONALERT,
> NULL,
> 0 );
>
> I guess the problem is in the way I create the file, but what ?
>
> Thomas
>
>

--
.../ray\..

Please remove ".spamblock" from my email address if you need to contact
me outside the newsgroup.

Archived from groups: microsoft.public.development.device.drivers,microsoft.public.win32.programmer.kernel,microsoft.public.windowsxp.device_driver.dev (More info?)

Ray,

You are right... Most of the Microsoft Apps don't open for share... I just
ran into this (again) with log files from an app that are CSV and if you
open them in Excel they are write locked... <sigh> and yeah my workaround
was to add yet another dialog to this app to read the logs....

The sad thing here for the OP (and me) is that if I don't change the file
extent and someone DOES open the files in Notepad (or Excel) we're
screwed.. <sigh>

Dave (who's out in App land this month not DDK)


"Ray Trent" <rat@synaptics.spamblock.com> wrote in message
news:%23BlH1VDnEHA.3868@TK2MSFTNGP11.phx.gbl...
>I have a vague memory that the last time I looked into this I ultimately
>discovered that Notepad wasn't opening the file for SHARE access, so it was
>failing because it couldn't get exclusive access... but this was a long
>time ago, so my memory could be faulty.
>
> I do remember writing my own app that opens the file "the right way" and
> getting it to work...
>
> Thomas Johansen wrote:
>> Hi
>>
>> In my driver, I do log some data in af file on the harddrive. It would be
>> nice to read the file with notepad, will the driver still is running and
>> using the file.
>> I do have some problems doing this.
>>
>> This is what I would like to do:
>> Read the file in eg. Notepad, while the driver stilling using the file
>> If the file allready exits, the driver opens the file, and append
>> anything
>> new to it.
>>
>> This is how I open the file in the driver
>>
>> // Create the file
>> status = ZwCreateFile( &hLogFile,
>> SYNCHRONIZE,
>> &objectAttributes,
>> &IoStatus,
>> 0,
>> FILE_ATTRIBUTE_NORMAL,
>> FILE_SHARE_WRITE | FILE_SHARE_WRITE,
>> FILE_OPEN_IF,
>> FILE_SYNCHRONOUS_IO_NONALERT,
>> NULL,
>> 0 );
>>
>> I guess the problem is in the way I create the file, but what ?
>>
>> Thomas
>>
>>
>
> --
> ../ray\..
>
> Please remove ".spamblock" from my email address if you need to contact me
> outside the newsgroup.

Archived from groups: microsoft.public.development.device.drivers,microsoft.public.win32.programmer.kernel,microsoft.public.windowsxp.device_driver.dev (More info?)

Thomas Johansen wrote:
> Hi
>
> In my driver, I do log some data in af file on the harddrive. It would be
> nice to read the file with notepad, will the driver still is running and
> using the file.
> I do have some problems doing this.
>
> This is what I would like to do:
> Read the file in eg. Notepad, while the driver stilling using the file
> If the file allready exits, the driver opens the file, and append anything
> new to it.
>
> This is how I open the file in the driver
>
> // Create the file
> status = ZwCreateFile( &hLogFile,
> SYNCHRONIZE,
> &objectAttributes,
> &IoStatus,
> 0,
> FILE_ATTRIBUTE_NORMAL,
> FILE_SHARE_WRITE | FILE_SHARE_WRITE,
> FILE_OPEN_IF,
> FILE_SYNCHRONOUS_IO_NONALERT,
> NULL,
> 0 );
>
> I guess the problem is in the way I create the file, but what ?
>
> Thomas
>
>

Hi,

Just a guess, but shouldn't that be:

FILE_SHARE_WRITE | FILE_SHARE_READ

 

Max Bolingbroke

Archived from groups: microsoft.public.development.device.drivers,microsoft.public.win32.programmer.kernel,microsoft.public.windowsxp.device_driver.dev (More info?)

OLE-based Office apps surely open files exclusively, and require byte range
locking (they fail on FSDs with no such locking. MSI Installer also fails).

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com

"Dave August" <august@NOSPAMacmesi.com> wrote in message
news:eF90WsEnEHA.3564@tk2msftngp13.phx.gbl...
> Ray,
>
> You are right... Most of the Microsoft Apps don't open for share... I just
> ran into this (again) with log files from an app that are CSV and if you
> open them in Excel they are write locked... <sigh> and yeah my workaround
> was to add yet another dialog to this app to read the logs....
>
> The sad thing here for the OP (and me) is that if I don't change the file
> extent and someone DOES open the files in Notepad (or Excel) we're
> screwed.. <sigh>
>
> Dave (who's out in App land this month not DDK)
>
>
> "Ray Trent" <rat@synaptics.spamblock.com> wrote in message
> news:%23BlH1VDnEHA.3868@TK2MSFTNGP11.phx.gbl...
> >I have a vague memory that the last time I looked into this I ultimately
> >discovered that Notepad wasn't opening the file for SHARE access, so it was
> >failing because it couldn't get exclusive access... but this was a long
> >time ago, so my memory could be faulty.
> >
> > I do remember writing my own app that opens the file "the right way" and
> > getting it to work...
> >
> > Thomas Johansen wrote:
> >> Hi
> >>
> >> In my driver, I do log some data in af file on the harddrive. It would be
> >> nice to read the file with notepad, will the driver still is running and
> >> using the file.
> >> I do have some problems doing this.
> >>
> >> This is what I would like to do:
> >> Read the file in eg. Notepad, while the driver stilling using the file
> >> If the file allready exits, the driver opens the file, and append
> >> anything
> >> new to it.
> >>
> >> This is how I open the file in the driver
> >>
> >> // Create the file
> >> status = ZwCreateFile( &hLogFile,
> >> SYNCHRONIZE,
> >> &objectAttributes,
> >> &IoStatus,
> >> 0,
> >> FILE_ATTRIBUTE_NORMAL,
> >> FILE_SHARE_WRITE | FILE_SHARE_WRITE,
> >> FILE_OPEN_IF,
> >> FILE_SYNCHRONOUS_IO_NONALERT,
> >> NULL,
> >> 0 );
> >>
> >> I guess the problem is in the way I create the file, but what ?
> >>
> >> Thomas
> >>
> >>
> >
> > --
> > ../ray\..
> >
> > Please remove ".spamblock" from my email address if you need to contact me
> > outside the newsgroup.
>
>