windows service not working for everyone.

[ayush patel]

Hi I have already posted this question before.I got a work around but doesn't seem reasonable.

I developed a windows service and I installed it in our server.everybod y in the office has access to a folder in the server.anybody can put a file in that shared folder and the service has to pick it up. but it does not pickup for everyone. it just picks up for some users. and the strange thing is it pickes up for rest of the users also but ocassionally.

Iam not getting how to make it work consistantly. any ideas on this issue.

does it have to work under admin account. if so what should i do for that.

please help!
Ayush

[balabaster]

its very wierd but sometimes I am getting this error


An unhandled exception of type 'System.IO.IOEx ception' occurred in mscorlib.dll

Additional information: The process cannot access the file 'C:\W080716.TXT ' because it is being used by another process.

W080716.TXT' file is not open anywhere.

Does your own application open this file anywhere and not dispose of connections to it? I sometimes see this if I've forgotten a:

sw.close()
sw.dispose()

On the streamwriter that's accessing the file...

[ayush patel]

no everytime i opened a StreamWriter I have closed it.

[balabaster]

no everytime i opened a StreamWriter I have closed it.

Sorry man, then without seeing your code, I've eliminated everything I can think of.

[ayush patel]

hmm.. i know thanks for trying anyway. I will post my solution if i find any.
Ayush

[PRR]

"System.Tim ers" is better option...
what i had suggested was that you should try to pause... when the watcher event is called....
Also try and optimized the buffer size:
FileSystemWatch er..InternalBuf ferSize Property .. the default is around 4K which can handle around 400 request per second... (if i am not wrong)..

I would suggest you do this:
1.First Pause on

private static void OnChanged(object source, FileSystemEventArgs e)
        {
            Thread.Sleep(1000);
            // This is enable the file to be tranfered before your code goes off..
 
        }
 

2. Instead Of writing all processin in OnChanged... Try doin this: inside onchanged ... write to Database the file name and processing status as "False"
3. Periodically run a function using timers to do processin on the file... this way if too many files are put up... then your service wont be creating large number of threads...
4. For testing purpose ... put your code in console program and check... Finally you can transfer to a windows service..

[ayush patel]

Hi,

I thought the problem may be as you said before: ownership of file is not available to watcher as soon as file is created.so I used Thread.Sleep(10 00);I also increased the buffersize of filewatcher. but still the service throws an error that the file that i just copied into the folder is not available. it is not recognizing the file atall.

this service is not used very frequently so there is no problem of processing many files at once.only one file is loaded that too may be 3 times a week.

do you have any idea why does it say

An unhandled exception of type 'System.IO.File NotFoundExcepti on' occurred in mscorlib.dll

Additional information: Could not find file 'C:\W080805.TXT '.
Ayush

[balabaster]

I wonder if the network share may be an issue? What is intriguing is that the FileSystemWatch er flags the file as having been created, but that System.IO.FileE xists returns false...

Did you try wrapping the copy in:
VB:

If System.IO.FileExists(e.FullPath) Then
...
End If

[PRR]

I thought the problem may be as you said before: ownership of file is not available to watcher as soon as file is created.so I used Thread.Sleep(10 00);I also increased the buffersize of filewatcher. but still the service throws an error that the file that i just copied into the folder is not available. it is not recognizing the file atall.

this service is not used very frequently so there is no problem of processing many files at once.only one file is loaded that too may be 3 times a week.

do you have any idea why does it say

An unhandled exception of type 'System.IO.File NotFoundExcepti on' occurred in mscorlib.dll

Additional information: Could not find file 'C:\W080805.TXT '.
Ayush

wow... now i m run out of ideas ... try testing it from another pc.... one more thing post your code where exception occurs and also the full exception message and stacktrace
i will go through ur post again .. n find something .. that will be 2moro.. meanwhile give as much info as possible ... so that we can trace the error...

as u have mentioned u r not using "C:\W080805.TXT "...still wats d content of it...

[ayush patel]

after a lot of work i found a work around not a solution though.i used Thread.Sleep(60 00); and also i placed FileWatch_Creat ed code in if loop saying if any file exists then read it else go to FileWatch_Creat ed again.

because as i increase the time in thread.sleep the service was getting delayed. so now till the service finds a file it will remain in the if else loop. it wont be a infinite loop since it is going to find a file eventually. there is a creation of file that is why it has entered into FileWatch_Creat ed event.

i dont think this is the best method but it worked.
Thanks to all who helped.

Ayush

[balabaster]

after a lot of work i found a work around not a solution though.i used Thread.Sleep(60 00); and also i placed FileWatch_Creat ed code in if loop saying if any file exists then read it else go to FileWatch_Creat ed again.

because as i increase the time in thread.sleep the service was getting delayed. so now till the service finds a file it will remain in the if else loop. it wont be a infinite loop since it is going to find a file eventually. there is a creation of file that is why it has entered into FileWatch_Creat ed event.

i dont think this is the best method but it worked.
Thanks to all who helped.

Ayush

Sorry you couldn't find a more ideal solution - it does seem like a bit of a hack to do it that way. But at least you have something until you find a way to resolve the issue properly...