Re: Cannot Delete a File - C# Discussion Boards

1-Aug-07 2:13

I need to be able to delete a log file. However i'm getting the following error:

{System.IO.IOException: The process cannot access the file 'C:\Web_Projects\eServiceRemoteDesktop\bin\Debug\mServiceLog.log' because it is being used by another process. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.File.Delete(String path)
at eServiceRemoteDesktop.frmTimeTicketSync.tlStpBtnClearLog_Click(Object sender, EventArgs e) in C:\Web_Projects\eServiceRemoteDesktop\frmTimeTicketSync.cs:line 229}

(line 229 being the line where i'm trying to do the abovementioned delete file. The emphasis added in the snippet is by me.)

I think that the Logger class we are using does not let go of the log file. I'm not going to be able to make any changes to the logger code though. Is there any other way to make this delete happen?

Two Thumbs Up!!
Mihir Karkare

Martin#1-Aug-07 2:25

Martin#

1-Aug-07 2:25

Hello,

Looks like your Logger class uses some kind of Stream, which doesn't get closed.
This is not good practice.
It is sometimes the case if an exception is thrown during stream write, your file stays also locked.
For this cases you could use an external program which unlocks the file (Only use it if it's really an "emergency")
http://www.chip.de/downloads/c1_downloads_18414122.html[^]
You could start this over the Process and ProcessStartInfo class of System.Diagnostics.

unlockerprocess.FileName = "unlocker.exe";
unlockerprocess.Arguments = filename + " /s /o";

All the best,

Martin

Luc Pattyn1-Aug-07 2:27

Luc Pattyn

1-Aug-07 2:27

If you programmatically fail to delete a file, insert a Thread.Sleep(5000);
just before your File.Delete().
If that helps, ask and I will repeat the explanation upon your request.

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Mihir Karkare2-Aug-07 1:06

2-Aug-07 1:06

Ill try that.
Anyway it turns out i may not have to delete hat file any way. But ill try doing this. Im curios to know why this works though.

Two Thumbs Up!!
Mihir Karkare

Naveed7271-Aug-07 3:21

Naveed727

1-Aug-07 3:21

My dear you want to delete such a file that is already in use by any other process.
First of all you should check which process using your desire file.
For check the process you can use unlocker softwares.

The second reason that i guess you have did that thing. That is you open the stream and did not close the stream.
You should check your code that you create the file you must close the stream before using the the file by any other function.
If you did't solve the problem then contact me personally
nidostyle@gmail.com
Smile | :)

Mihir Karkare2-Aug-07 1:09

2-Aug-07 1:09

Hey thanks for helping but the requirement has changed. Turns out i dont have to delete the file anyway.
Thanks for benig so helpful.

Two Thumbs Up!!
Mihir Karkare

Software_Specialist1-Aug-07 4:53

Software_Specialist

1-Aug-07 4:53

You first need to stop the service which is using this log file and then delete the log and restart the service.
You can stop and restart the service using WMI approach.
i can write down the code for you if you want, its quite simple.

SS

Mihir Karkare2-Aug-07 1:11

Hot to make two separate apps communicate?

2-Aug-07 1:11

Thank you so much. But turns out i dont have to perform that deletion anyway. If you could, please share the code anyway!
thanks

Two Thumbs Up!!
Mihir Karkare

michal.kreslik1-Aug-07 2:08

michal.kreslik

1-Aug-07 2:08

Hello,

what is the easiest way to make two separate compiled apps exchange data through shared memory pipeline or something like that?

Thanks much,
Michal

Luc Pattyn1-Aug-07 2:31

Luc Pattyn

1-Aug-07 2:31

An easy way is using Socket class; you may need to explain to your FireWall it
should trust that tho.

Other ways:
- Windows messaging
- a memory mapped file
- a named pipe
- WM_COPYDATA

and there may be others.

I most often use a named pipe, which takes more code, but avoids all hassles
with firewalls.

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

originSH1-Aug-07 2:45

originSH

1-Aug-07 2:45

Remoting[^] is the official way to do it for both interprocess and intermachine.

michal.kreslik1-Aug-07 3:12

michal.kreslik

1-Aug-07 3:12

Thanks both for your ideas.

I'm going to look into all of the above concepts.

I thought that remoting is just a way to facilitate communication over network.

Thanks again,
Michal

Not Active1-Aug-07 3:48

Not Active

1-Aug-07 3:48

Remoting is also used internally in applications that create and use multiple app domains.

only two letters away from being an asset