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Posted to log4net-user@logging.apache.org by "Price, Randall" <ra...@vt.edu> on 2007/04/04 22:37:52 UTC
FileAppender+MinimalLock not working as expected
Hello,
I have an WinForms application in C# that generates data files for a
graphing application. This application uses log4net to log progress,
information, errors, etc. I also want this application to be able to
view the log file. When I try to open the log file I get the following
error message:
The process cannot access the file "C:\....\MyApplication.log" because
it is being used by another process.
I searched Google and found that I should add the following line to my
configuration file:
<lockingModel type="log4net.Appender.FileAppender+MinimalLock\" />
Adding this does not seem to allow access to log file. I expected to be
able to open the log file in Notepad by double-clicking on it but that
also generates the same error. I want to be able to have my application
open the log file and display the contents in a TextBox but I get the
same error when I try that as well.
I am using:
Visual Studio 2005 Professional
Microsoft .NET Framework 2.0
log4net v1.2.10.0
Windows XP Pro w/SP2
Here is my configuration file:
<?xml version="1.0" encoding="utf-8" ?>
<log4net>
<appender name="RollingFile"
type="log4net.Appender.RollingFileAppender">
<file value="MyApplication.log" />
<appendToFile value="true" />
<maximumFileSize value="100KB" />
<maxSizeRollBackups value="2" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock\" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger -
%message%newline" />
</layout>
</appender>
<root>
<level value="DEBUG" />
<appender-ref ref="RollingFile" />
</root>
</log4net>
Am I missing something here?
Thanks,
Randall Price
Secure Enterprise Technology Initiatives
Microsoft Implementation Group
Virginia Tech Information Technology
1700 Pratt Drive
Blacksburg, VA 24060
Email: Randall.Price@vt.edu
Phone: (540) 231-4396
Re: FileAppender+MinimalLock not working as expected - Correction!
Posted by Daniel Essin <es...@ieee.org>.
I've been using the following in a web page and it seems to work ok.
It gets the latest file created by the rolling appender.
I'm not sure that this is adding anything that you don't already know.
-----------------------------------
try
{
string logDir = ConfigurationManager.AppSettings["LogDir"];
DirectoryInfo dirInfo = new DirectoryInfo(logDir);
string logFileNameRoot =
ConfigurationManager.AppSettings["LogFileNameRoot"];
FileInfo[] fileInfoArray =
dirInfo.GetFiles(logFileNameRoot + "*.*", SearchOption.TopDirectoryOnly);
Array.Sort(fileInfoArray, new
ComparableFileInfo(UtilityFunctions.CompareByOptions.LastWriteTimeDescending));
if (fileInfoArray.Length > 0)
{
StreamReader st = fileInfoArray[0].OpenText();
string line = st.ReadLine();
do
{
Response.Write(line + "<p>");
//Response.Write(line + "<p>");
line = st.ReadLine();
} while (!st.EndOfStream);
}
}
catch
{
}
finally
{
Response.End();
}
It uses:
--------------------------
public enum CompareByOptions
{
FileNameAscending,
FileNameDescending,
LastWriteTimeAscending,
LastWriteTimeDescending,
LengthAscending,
LengthDescending
}
public class ComparableFileInfo : IComparer
{
CompareByOptions compareBy = CompareByOptions.FileNameAscending;
public ComparableFileInfo(CompareByOptions cBy)
{
compareBy = cBy;
}
#region IComparer Members
int IComparer.Compare(object x, object y)
{
FileInfo f1 = (FileInfo)x;
FileInfo f2 = (FileInfo)y;
switch (compareBy)
{
case CompareByOptions.FileNameAscending:
return string.Compare(f1.Name, f2.Name);
case CompareByOptions.FileNameDescending:
return string.Compare(f2.Name, f1.Name);
case CompareByOptions.LastWriteTimeAscending:
return DateTime.Compare(f1.LastWriteTime,
f2.LastWriteTime);
case CompareByOptions.LastWriteTimeDescending:
return DateTime.Compare(f2.LastWriteTime,
f1.LastWriteTime);
case CompareByOptions.LengthAscending:
return (int)(f1.Length - f2.Length);
case CompareByOptions.LengthDescending:
return (int)(f2.Length - f1.Length);
}
return -1;
}
#endregion
}
-------------------------------------------------------------
Dan Essin
Price, Randall wrote:
>
> Correction!
>
>
>
> When my WinForms application is running I CAN double-click on the log
> file from Windows Explorer and open the log file in Notepad.
>
>
>
> But when I click my View Log File button on my application, I get the
> "process cannot access ... being used by another process" error
> message. However process should be the same process making the
> request to open the file for reading.
>
>
>
> Has anyone ever done something like this before?
>
>
>
> Thanks,
>
>
>
> *Randall Price*
>
> Secure Enterprise Technology Initiatives
>
> Microsoft Implementation Group
>
> Virginia Tech Information Technology
>
> 1700 Pratt Drive
>
> Blacksburg, VA 24060
>
> Email: Randall.Price@vt.edu <ma...@vt.edu>
>
> Phone: (540) 231-4396
>
> ------------------------------------------------------------------------
>
> *From:* Price, Randall [mailto:randallp@vt.edu]
> *Sent:* Wednesday, April 04, 2007 4:38 PM
> *To:* log4net-user@logging.apache.org
> *Subject:* FileAppender+MinimalLock not working as expected
>
>
>
> Hello,
>
>
>
> I have an WinForms application in C# that generates data files for a
> graphing application. This application uses log4net to log progress,
> information, errors, etc. I also want this application to be able to
> view the log file. When I try to open the log file I get the
> following error message:
>
>
>
> The process cannot access the file "C:\....\MyApplication.log" because
> it is being used by another process.
>
>
>
> I searched Google and found that I should add the following line to my
> configuration file:
>
>
>
> <lockingModel type="log4net.Appender.FileAppender+MinimalLock\" />
>
>
>
> Adding this does not seem to allow access to log file. I expected to
> be able to open the log file in Notepad by double-clicking on it but
> that also generates the same error. I want to be able to have my
> application open the log file and display the contents in a TextBox
> but I get the same error when I try that as well.
>
>
>
> I am using:
>
> Visual Studio 2005 Professional
>
> Microsoft .NET Framework 2.0
>
> log4net v1.2.10.0
>
> Windows XP Pro w/SP2
>
>
>
> Here is my configuration file:
>
>
>
> <?xml version="1.0" encoding="utf-8" ?>
>
> <log4net>
>
> <appender name="RollingFile"
> type="log4net.Appender.RollingFileAppender">
>
> <file value="MyApplication.log" />
>
> <appendToFile value="true" />
>
> <maximumFileSize value="100KB" />
>
> <maxSizeRollBackups value="2" />
>
>
>
> <lockingModel type="log4net.Appender.FileAppender+MinimalLock\" />
>
>
>
> <layout type="log4net.Layout.PatternLayout">
>
> <conversionPattern value="%date [%thread] %-5level %logger -
> %message%newline" />
>
> </layout>
>
> </appender>
>
>
>
> <root>
>
> <level value="DEBUG" />
>
> <appender-ref ref="RollingFile" />
>
> </root>
>
> </log4net>
>
>
>
> Am I missing something here?
>
>
>
> Thanks,
>
>
>
> *Randall Price*
>
> Secure Enterprise Technology Initiatives
>
> Microsoft Implementation Group
>
> Virginia Tech Information Technology
>
> 1700 Pratt Drive
>
> Blacksburg, VA 24060
>
> Email: Randall.Price@vt.edu <ma...@vt.edu>
>
> Phone: (540) 231-4396
>
>
>
RE: FileAppender+MinimalLock not working as expected - Correction!
Posted by "Price, Randall" <ra...@vt.edu>.
Correction!
When my WinForms application is running I CAN double-click on the log
file from Windows Explorer and open the log file in Notepad.
But when I click my View Log File button on my application, I get the
"process cannot access ... being used by another process" error message.
However process should be the same process making the request to open
the file for reading.
Has anyone ever done something like this before?
Thanks,
Randall Price
Secure Enterprise Technology Initiatives
Microsoft Implementation Group
Virginia Tech Information Technology
1700 Pratt Drive
Blacksburg, VA 24060
Email: Randall.Price@vt.edu
Phone: (540) 231-4396
________________________________
From: Price, Randall [mailto:randallp@vt.edu]
Sent: Wednesday, April 04, 2007 4:38 PM
To: log4net-user@logging.apache.org
Subject: FileAppender+MinimalLock not working as expected
Hello,
I have an WinForms application in C# that generates data files for a
graphing application. This application uses log4net to log progress,
information, errors, etc. I also want this application to be able to
view the log file. When I try to open the log file I get the following
error message:
The process cannot access the file "C:\....\MyApplication.log" because
it is being used by another process.
I searched Google and found that I should add the following line to my
configuration file:
<lockingModel type="log4net.Appender.FileAppender+MinimalLock\" />
Adding this does not seem to allow access to log file. I expected to be
able to open the log file in Notepad by double-clicking on it but that
also generates the same error. I want to be able to have my application
open the log file and display the contents in a TextBox but I get the
same error when I try that as well.
I am using:
Visual Studio 2005 Professional
Microsoft .NET Framework 2.0
log4net v1.2.10.0
Windows XP Pro w/SP2
Here is my configuration file:
<?xml version="1.0" encoding="utf-8" ?>
<log4net>
<appender name="RollingFile"
type="log4net.Appender.RollingFileAppender">
<file value="MyApplication.log" />
<appendToFile value="true" />
<maximumFileSize value="100KB" />
<maxSizeRollBackups value="2" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock\" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger -
%message%newline" />
</layout>
</appender>
<root>
<level value="DEBUG" />
<appender-ref ref="RollingFile" />
</root>
</log4net>
Am I missing something here?
Thanks,
Randall Price
Secure Enterprise Technology Initiatives
Microsoft Implementation Group
Virginia Tech Information Technology
1700 Pratt Drive
Blacksburg, VA 24060
Email: Randall.Price@vt.edu
Phone: (540) 231-4396