Re: VB.Net file access problem with UNC
From: Sarah (sarah.nntp_at_powertechcanada.com)
Date: 01/03/05
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- In reply to: Nick Malik [Microsoft]: "Re: VB.Net file access problem with UNC"
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Date: Mon, 03 Jan 2005 03:07:15 GMT
Ok, thx for your help Nick!
"Nick Malik [Microsoft]" <nickmalik@hotmail.nospam.com> wrote in message
news:3b2Cd.320877$HA.199013@attbi_s01...
> The error is very likely caused by the network driver. Converging
> Technologies may have a fix, especially if you send them a small app that
is
> able to recreate the problem, allowing them to debug the driver.
>
> If XP is stopping, there is little or nothing that VB.Net can do about it.
>
> If Converging Technologies cannot or will not provide a fix, you should
look
> at simply mapping the network drive yourself and using the mapped drive.
> Apparently, the network driver doesn't collapse that way.
>
> --
> --- Nick Malik [Microsoft]
> MCSD, CFPS, Certified Scrummaster
> http://blogs.msdn.com/nickmalik
>
> Disclaimer: Opinions expressed in this forum are my own, and not
> representative of my employer.
> I do not answer questions on behalf of my employer. I'm just a
> programmer helping programmers.
> --
> "Sarah" <sarah.nntp@powertechcanada.com> wrote in message
> news:z80Cd.47643$KO5.36787@clgrps13...
> > It is compatible with Windows XP - it says so. Artisoft sold Lantastic
to
> > Converging Technologies.
> (http://www.spartacom.com/products/lantastic.htm).
> >
> > The only problem is when the system is disconnected under UNC. Only when
> my
> > program is running in loop mode, does it crash. When the network is
> > disconnected without my program running, there are no problems. When the
> UNC
> > resource is mapped, no crashes either. So, I'm hoping there is some way
to
> > handle the error.
> >
> > This is a legacy network that I have NO control over - and, it has to
use
> > Lantastic because of remote boot clients in DOS for POS systems.
> >
> >
> > "Nick Malik [Microsoft]" <nickmalik@hotmail.nospam.com> wrote in message
> > news:DM%Bd.609134$wV.277235@attbi_s54...
> > > Lantastic! Why didn't you say so?
> > >
> > > I didn't even think that Artisoft supported Lantastic any more!
> > >
> > > The problem is clearly the Lantastic driver.
> > >
> > > I wonder why you use Lantastic anyway. It is simple to set up a TCP
> > > network. The drivers are built in to Windows XP/98/NT/2000/2003 as
well
> > as
> > > every version of Unix and Linux that I know of. The hardware is cheap
> and
> > > the wiring can be done by anyone (I have a TCP network in my house).
> > >
> > > That's the reason that the market dried up for Lantastic... Microsoft
> > built
> > > their functionality right into the OS, and Lantastic had no compelling
> > > reason why someone should buy their product. They let their product
go
> > > stale and were overtaken.
> > >
> > > I hate to say this, but you are asking a question on the wrong
> newsgroup.
> > > You need to see if you can find a Lantastic driver that is compatible
> with
> > > Windows XP. That's a question for Artisoft.
> > >
> > > --
> > > --- Nick Malik [Microsoft]
> > > MCSD, CFPS, Certified Scrummaster
> > > http://blogs.msdn.com/nickmalik
> > >
> > > Disclaimer: Opinions expressed in this forum are my own, and not
> > > representative of my employer.
> > > I do not answer questions on behalf of my employer. I'm just a
> > > programmer helping programmers.
> > > --
> > > "Sarah" <sarah.nntp@powertechcanada.com> wrote in message
> > > news:2XNBd.43938$KO5.39123@clgrps13...
> > > > "Nick Malik [Microsoft]" <nickmalik@hotmail.nospam.com> wrote in
> message
> > > > news:keKBd.8230$3m6.4869@attbi_s51...
> > > > > First off, if you can't see the error, you can't address it.
> > > > > Turn off "auto reboot on system crash" on your XP client.
> > > > > http://www.theeldergeek.com/auto_reboot_on_system_crash.htm
> > > > >
> > > >
> > > >
> > > > Ok, here is the blue screen that comes up when auto reboot on system
> > crash
> > > > is disabled:
> > > >
> > > > ==========
> > > >
> > > >
> > > > A problem has been detected and windows has been shut down to
prevent
> > > damage
> > > > to your computer.
> > > >
> > > > BAD_POOL_CALLER
> > > >
> > > > If this is the first time you've seen this stop error screen,
restart
> > your
> > > > computer. If this screen appears again, follow these steps:
> > > >
> > > > Check to make sure any new hardware or software is properly
installed.
> > If
> > > > this is a new installation, ask your hardware or software
manufacturer
> > for
> > > > any windows updates you might need.
> > > >
> > > > If problems continue, disable or remove any newly installed hardware
> or
> > > > software. Disable BIOS memory options such as caching or shadowing.
If
> > you
> > > > need to use safe mode to remove or disable components, restart your
> > > > computer, press F8 to select Advanced Startup Options, and then
select
> > > safe
> > > > mode.
> > > >
> > > > Technical Information:
> > > >
> > > > *** STOP: 0x000000C2 (0x00000050, 0xE1BD5000, 0x00000BD5,
0x0A800000)
> > > >
> > > > Beginning dump of physical memory
> > > > Physical memory dump complete
> > > > Contact your system administrator or technical support group for
> further
> > > > assistance.
> > > >
> > > >
> > > > ==========
> > > >
> > > > This is a clean system on which I've installed XP cleanly from
CD-ROM
> 3
> > > > times - I've also tried another brand new PC - same problem. This is
> the
> > > > only software that is running besides the Lantastic Network software
> > used
> > > to
> > > > connect to the DOS Lantastic server. To test, I'm pulling the
network
> > > > connection out from the DOS server to take it off-line -- and, that
is
> > the
> > > > only thing I am doing. When the VB.NET program is set to get the
> network
> > > > file in the try block from a mapped drive to the DOS server (S:\),
no
> > > crash
> > > > occurs. When I use UNC to get the file in the try block, take the
DOS
> > > server
> > > > off-line, the program (system) crashes.
> > > >
> > > >
> > > > > Also, if you haven't installed XP SP2 yet, do it now. Your
problem
> > may
> > > > > already have been fixed.
> > > >
> > > > Same problem on XP SP2.
> > > >
> > > > > An error in a .net app should never crash a system. In fact, I'm
> not
> > > > sure
> > > > > your app is actually causing the system crash.
> > > >
> > > > The only thing I change is the way the path is referenced when
> > > communicating
> > > > with the DOS server. I've streamlined the code and tested a very
> simple
> > > > version. When my program references a UNC path, it crashes when that
> UNC
> > > > path is not available.
> > > >
> > > > When I reference a mapped network drive (mapped to the very same UNC
> > > path),
> > > > no crash occurs - it just does its check and fails (does not do the
> file
> > > > copy). Then, after the fail, I have the code enable the timer again
> and
> > it
> > > > checks again then as scheduled every 10 seconds. When I bring the
DOS
> > > server
> > > > on-line again, it will work again and do the file copy fine.
> > > >
> > > > When everything is connected, identical code runs fine in both
> > situations
> > > > (UNC & Mapped Drive) and the remote files are copied without any
> issues.
> > > So,
> > > > the simple file copy code seems to work fine.
> > > >
> > > > Basically, in summary:
> > > >
> > > > Reference DOS Server using UNC, DOS Server on-line: file copy works
> > > > Reference DOS Server using UNC, DOS Server OFF-LINE: system crashes,
> > blue
> > > > screen, have to restart
> > > > Reference DOS Server using mapped drive, DOS Server on-line: file
copy
> > > works
> > > > Reference DOS Server using mapped drive, DOS Server OFF-LINE:
program
> > > runs -
> > > > no file copy, when server back on-line again file copy works again.
> > > >
> > > >
> > > > >
> > > > > Have you checked the error log?
> > > > >
> > > >
> > > > Nothing in the Application/Security log.
> > > >
> > > > System log has 2 errors that I believe are related to this problem:
> > > >
> > > > =======
> > > >
> > > > Event
> > > > Source: Save Dump
> > > > Event ID: 1001
> > > > Description:
> > > > The computer has rebooted from a bugcheck. The bugcheck was:
> 0x000000c2
> > > > (0x00000050, 0xe1bd5000, 0x00000bd5, 0x0a800000). A dump was saved
in:
> > > > C:\WINDOWS\Minidump\Mini010205-01.dmp.
> > > >
> > > > =======
> > > >
> > > > Event
> > > > Source: System Error
> > > > Category: (102)
> > > > Event ID: 1003
> > > > Description:
> > > > Error code 000000c2, parameter1 00000050, parameter2 e1bd5000,
> > parameter3
> > > > 00000bd5, parameter4 0a800000.
> > > >
> > > > =======
> > > >
> > > > There are acpi errors (on every reboot) and W32Time errors (every so
> > > often,
> > > > including reboot) that are also listed in this system's error log.
> > > >
> > > >
> > > > > --
> > > > > --- Nick Malik [Microsoft]
> > > > > MCSD, CFPS, Certified Scrummaster
> > > > > http://blogs.msdn.com/nickmalik
> > > > >
> > > > > Disclaimer: Opinions expressed in this forum are my own, and not
> > > > > representative of my employer.
> > > > > I do not answer questions on behalf of my employer. I'm just a
> > > > > programmer helping programmers.
> > > > > --
> > > > > "Sarah" <sarah.nntp@powertechcanada.com> wrote in message
> > > > > news:f7IBd.42994$KO5.14316@clgrps13...
> > > > > > "Nick Malik [Microsoft]" <nickmalik@hotmail.nospam.com> wrote in
> > > message
> > > > > > news:eLGBd.316849$HA.295458@attbi_s01...
> > > > > > > what do you mean by "crashes?"
> > > > > > > Do you get an error message?
> > > > > >
> > > > > > No error message - VB.Net program on Windows XP crashes and
> reboots
> > > > > > immediately
> > > > > >
> > > > > > >
> > > > > > > How big are these files? Do they take more than 10 seconds to
> > copy
> > > > from
> > > > > > one
> > > > > > > place to another?
> > > > > >
> > > > > > No, only a fraction of a second.
> > > > > >
> > > > > >
> > > > > > >
> > > > > > > Are you testing this by taking down the server, or does this
> just
> > > > happen
> > > > > > > without intervention? If the latter, how often?
> > > > > > >
> > > > > >
> > > > > > I've done tests by taking down the server. But, in the
production
> > > > > > environment, this server goes through a number of reboots under
> > normal
> > > > > > operations daily.
> > > > > >
> > > > > > > I'm wondering if you aren't attempting to execute the timed
code
> > > while
> > > > > it
> > > > > > is
> > > > > > > still running from the previous tick?
> > > > > > >
> > > > > >
> > > > > >
> > > > > > I've disabled the timer during the tick - so, that is not
> happening.
> > > > > >
> > > > > > > --
> > > > > > > --- Nick Malik [Microsoft]
> > > > > > > MCSD, CFPS, Certified Scrummaster
> > > > > > > http://blogs.msdn.com/nickmalik
> > > > > > >
> > > > > > > Disclaimer: Opinions expressed in this forum are my own, and
not
> > > > > > > representative of my employer.
> > > > > > > I do not answer questions on behalf of my employer. I'm
just
> a
> > > > > > > programmer helping programmers.
> > > > > > > --
> > > > > > > "Sarah" <sarah.nntp@powertechcanada.com> wrote in message
> > > > > > > news:uADBd.41512$KO5.40042@clgrps13...
> > > > > > > > I need to access some data on a server. I can access it
> directly
> > > > using
> > > > > > UNC
> > > > > > > > (i.e. \\ComputerName\ShareName\Path\FileName) or using a
> mapped
> > > > > network
> > > > > > > > drive resource (S:\Path\FileName).
> > > > > > > >
> > > > > > > > Here is my problem: my vb.net program has problems with UNC.
> If
> > > the
> > > > > UNC
> > > > > > > > server is restarted or goes off-line, my VB.net program
> crashes.
> > > The
> > > > > > code
> > > > > > > > for UNC access to the file is included below and is put in
the
> > > tick
> > > > > > event
> > > > > > > of
> > > > > > > > a form timer control running every 10 seconds. The program
> does
> > > not
> > > > > > crash
> > > > > > > > when the network server goes down using the same code below
> > except
> > > > > that
> > > > > > > the
> > > > > > > > network resource is referenced using a mapped drive (i.e.
> S:\).
> > > > > > > >
> > > > > > > > =======
> > > > > > > >
> > > > > > > > Try
> > > > > > > >
> > > > > > > > If File.Exists("\\Server1\Files\Data1.dbf") Then
> > > > > > > >
> > > > > > > > Try
> > > > > > > >
> > > File.Copy(("\\Server1\Files\Data1.dbf",
> > > > > > > > "C:\Data\tblData.dbf", True)
> > > > > > > > Catch
> > > > > > > > 'Do Nothing
> > > > > > > > End Try
> > > > > > > >
> > > > > > > > End If
> > > > > > > >
> > > > > > > > Catch
> > > > > > > >
> > > > > > > > 'msgbox error
> > > > > > > >
> > > > > > > > End Try
> > > > > > > >
> > > > > > > > =======
> > > > > > > >
> > > > > > > > The reason I would prefer to use UNC is so that the drive
does
> > not
> > > > > have
> > > > > > to
> > > > > > > > be mapped on the clients computer - and the client cannot
goof
> > > > around
> > > > > > with
> > > > > > > > the server files that easily (I do not have the ability to
> > modify
> > > > > > > > permissions in this situation at all).
> > > > > > > >
> > > > > > > > Note: the program only crashes after the program has been
> > running
> > > > for
> > > > > a
> > > > > > > > while (i.e. after multiple ticks). So, I'm guessing that if
it
> > is
> > > in
> > > > > the
> > > > > > > > middle of a check and the server goes down, then it crashes.
> > > > Because,
> > > > > if
> > > > > > > you
> > > > > > > > put an invalid UNC path and start up the program, it handles
> > that
> > > > > > without
> > > > > > > a
> > > > > > > > problem ( i.e. no crashes, just runs every 10 seconds).
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>
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- In reply to: Nick Malik [Microsoft]: "Re: VB.Net file access problem with UNC"
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