The Log4Net mailing list is a great source of information about using log4Net, in this forum we collect all the messages in the log4net user list and some selected threads from the developer list.
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Michael SALOMON
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| 06/26/2009 3:21 PM |
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Hi !
I'm using log4net 1.2.10.0 and .NET 2.0
I wrote a Windows Form application and I want to be able to log debug messages in a ColoredConsoleAppender (or whatever type of Console appender).
If I compile my application as a Console Application, this works fine... If I compile it as a Windows Forms application, then I understand that no console is attached to my application, fair enough..
In this case I programmaticaly attach a brand new console by using this piece of code :
[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool AllocConsole();
[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool FreeConsole();
[DllImport("kernel32.dll", SetLastError = true)]
private static extern bool AttachConsole(int dwProcessId);
public static void SetConsole()
{
foreach (log4net.Appender.IAppender appender in log4net.LogManager.GetRepository().GetAppenders())
{
System.Type type = appender.GetType();
if ((type == typeof(log4net.Appender.ColoredConsoleAppender))
|| (type == typeof(log4net.Appender.ConsoleAppender)))
{
if (AllocConsole())
AttachConsole(-1);
return;
}
}
So at startup, if any console appender is found, I attach a console...
At this stage, I can do things like : Console.WriteLine() , and it works very fine, I can see the messages in my new console...
But for some reason, the Console Appenders do not forward their messages to this console...
Do I miss something or do something wrong ?
I tried to create a custom appender that inherits ConsoleAppender and do something like:
protected override void Append (LoggingEvent loggingEvent)
{
Console.WriteLine (RenderLoggingEvent(loggingEvent);
}
This works fine with my attached console, but I loose all the nice colored features... And fact is I do want them :)
Thanks a lot for your help
Michael
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Radovan Raszka
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| 06/26/2009 3:44 PM |
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Hello,
try to allocate your console _before_ log4net is configured.
Radovan |
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Michael SALOMON
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| 06/26/2009 4:28 PM |
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thx for your answer ! i'll try that but then I need to change my approach.
Originally I wanted to attach a console depending on log4net config, so now i will try to detach the console depending on the config ;)
I don't mind doing that
I'll let you know if it works.
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Michael SALOMON
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| 06/26/2009 7:18 PM |
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Well, I tried this and it still does not work:
if (AllocConsole())
AttachConsole(-1);
// this file exists....
XmlConfigurator.ConfigureAndWatch(new System.IO.FileInfo("./Log4Net.config"));
LogManager.GetLogger("DebugLogger").Debug("message");
My config file:
<?xml version="1.0" encoding="utf-8" ?>
<log4net>
<appender name="DebugConsoleAppender" type="log4net.Appender.ColoredConsoleAppender">
<threshold value="ALL"/>
<mapping>
<level value="FATAL" />
<foreColor value="White" />
<backColor value="Red, HighIntensity" />
</mapping>
<mapping>
<level value="ERROR" />
<backColor value="Red, HighIntensity" />
</mapping>
<mapping>
<level value="WARN" />
<backColor value="Yellow, HighIntensity" />
</mapping>
<mapping>
<level value="DEBUG" />
<backColor value="Green" />
</mapping>
<mapping>
<level value="INFO" />
<foreColor value="White" />
</mapping>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%ndc %date %-4timestamp %-5level - %message %newline%exception " />
</layout>
</appender>
<root>
<level value="ALL" />
</root>
<logger name="DebugLogger">
<level value="ALL"/>
<appender-ref ref="DebugConsoleAppender"/>
</logger>
</log4net>
Thanks for your help !
Michael
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Ron Grabowski
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| 06/27/2009 1:48 AM |
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ColoredConsoleAppender calls Console.OpenStandardOutput() in ActivateOptions to store a Stream that represents the console. When you create a console in a WinForm app you need to call ActivateOptions again so the internal Stream can be re-initialized:
public partial class Form1 : Form
{
[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool AllocConsole();
[DllImport("kernel32.dll", SetLastError = true)]
private static extern bool AttachConsole(int dwProcessId);
public Form1()
{
InitializeComponent();
var appender = new ColoredConsoleAppender();
var mapping = new ColoredConsoleAppender.LevelColors
{
Level = Level.Debug,
ForeColor = ColoredConsoleAppender.Colors.Red,
BackColor = ColoredConsoleAppender.Colors.Blue
};
appender.AddMapping(mapping);
appender.ActivateOptions();
appender.Layout = new SimpleLayout();
BasicConfigurator.Configure(appender);
SetConsole();
ILog log = LogManager.GetLogger(typeof(Form1));
log.Debug("Hello World");
}
public static void SetConsole()
{
foreach (IAppender appender in LogManager.GetRepository().GetAppenders())
{
var coloredConsole = appender as ColoredConsoleAppender;
if (coloredConsole != null)
{
if (AllocConsole())
{
AttachConsole(-1);
coloredConsole.ActivateOptions();
}
return;
}
}
}
}
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Ron Grabowski
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| 06/27/2009 2:06 AM |
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This works for me:
public partial class Form1 : Form
{
[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool AllocConsole();
[DllImport("kernel32.dll", SetLastError = true)]
private static extern bool AttachConsole(int dwProcessId);
public Form1()
{
InitializeComponent();
if (AllocConsole())
AttachConsole(-1);
var appender = new ColoredConsoleAppender();
var mapping = new ColoredConsoleAppender.LevelColors
{
Level = Level.Debug,
ForeColor = ColoredConsoleAppender.Colors.Red,
BackColor = ColoredConsoleAppender.Colors.Blue
};
appender.AddMapping(mapping);
appender.ActivateOptions();
appender.Layout = new SimpleLayout();
BasicConfigurator.Configure(appender);
ILog log = LogManager.GetLogger(typeof(Form1));
log.Debug("Hello World");
}
}
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Michael SALOMON
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| 06/30/2009 3:21 PM |
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Hi !!
I truely apologize for this late answer!
This works great for me !! Thanks so much for your help, log4net definitely rocks !
Regards
michael
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