Re: Log4Cocoa
Re: Log4Cocoa
- Subject: Re: Log4Cocoa
- From: Chris Hanson <email@hidden>
- Date: Mon, 3 Feb 2003 22:13:01 -0600
At 4:46 PM +0100 2/3/03, Jacques wrote:
Is there any body who have succesfully used Log4Cocoa in a project ?
Are you having problems using it in your application? I've built a
couple of internal projects that use it.
For those who don't know, Log4Cocoa is an Open Source logging
framework that Bob Frank wrote modeled on Log4J. It's at
<
http://log4cocoa.sourceforge.net/>. Everyone should check it out.
(I have commit access to the CVS repository, so I may be biased...)
I haven't integrated the Log4Cocoa framework into the projects I've
built. Instead I build the framework with an install path of
/Library/Frameworks, put it at that location, and then have my
projects link against that.
I also put the following boilerplate in my application's controller class:
- (void)configureLogging
{
#if defined(DEBUG)
[[L4Logger rootLogger] setLevel:[L4Level all]];
#else
[[L4Logger rootLogger] setLevel:[L4Level fatal]];
#endif
[[L4Logger rootLogger] addAppender:
[[[L4ConsoleAppender alloc] initStandardOutWithLayout:
[L4Layout simpleLayout]] autorelease]];
L4Info(@"Logging configured.");
}
- (void)applicationDidFinishLaunching:(NSNotification *)notification
{
// Configure Log4Cocoa
[self configureLogging];
// do other stuff
}
(I have additional compile switches on these projects to define DEBUG
when I build the project using the Development build style, and to
define both DEBUG and TESTING when I build the project using the Test
build style I set up to use the OCUnit framework. No, I haven't
integrated OCUnit with Log4Cocoa.)
There's one other caveat to using Log4Cocoa: If you want to use a
format string with one of the logging macros, you need to use it as
so:
L4Info(([NSString stringWithFormat:@"%@", someMessage]));
Trying it without the doubled set of parentheses will confuse the C
preprocessor and you'll get some odd error about passing too many
arguments to a macro. The inner set of parentheses convinces the
preprocessor to treat the Objective-C message send as a single
argument.
Hope this helps. If you have more questions, feel free to ask here
or on the Log4Cocoa mailing list.
-- Chris
--
Chris Hanson, bDistributed.com, Inc. | Email: email@hidden
Custom Application Development | Phone: +1-847-372-3955
http://bdistributed.com/ | Fax: +1-847-589-3738
http://bdistributed.com/Articles/ | Personal Email: email@hidden
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