Changing the log Format

[Sohil]

Hi ,

I have just recently started using lumberjack.

I was checking out the logging framework.

Following is the thing i tried out

NSLog(@"Logger Iniit Done");
DDLogVerbose(@"Hello Done int");
DDLogVerbose(@"Broken sprocket detected!");
DDLogError(@"Broken sprocket detected!");

and following was the output

2011-12-18 10:21:29.644 TestingLogging[3323:10103] Logger Iniit Done
2011-12-18 10:21:29:646 TestingLogging[3323:10103] Hello Done int
2011-12-18 10:21:29:653 TestingLogging[3323:10103] Broken sprocket
detected!
2011-12-18 10:21:29:653 TestingLogging[3323:10103] Broken sprocket
detected!

I was looking for output like this which tells me more about the type
of message

2011-12-18 10:21:29:646 TestingLogging[3323:10103] INFO Hello Done int
2011-12-18 10:21:29:653 TestingLogging[3323:10103] INFO Broken
sprocket detected!
2011-12-18 10:21:29:653 TestingLogging[3323:10103] ERROR Broken
sprocket detected!

wanted to know if there was a easy way of changing this.
I looked through the wiki ,i think CustomFormatter will be the way.
But wanted to know if there was a easy way to do so.

Thanks,
Sohil

[Joe Francia]

CustomLogFormatters are the easy way to do it:

------------------------------------------------------------------------------------------------------------------------------

//MyCustomLogFormatters.h

#import "DDLog.h"

@interface MyFileLogFormatter : NSObject <DDLogFormatter>

@end

//Add other custom formatters if you want the messages displayed differently in say the console vs. the log file

//-----------------------------------------------------------------------------------------------------------------------------

//MyCustomLogFormatters.m

#import "MyCustomLogFormatters.h"

@implementation MyFileLogFormatter

- (NSString *)formatLogMessage:(DDLogMessage *)logMessage

{

    //Alter the message to your liking

    NSString *msg = [logMessage->logMsg stringByReplacingOccurrencesOfString:@"\n" withString:@"<br>"];

    

    NSString *logLevel;

    switch (logMessage->logFlag)

    {

        case LOG_FLAG_ERROR : logLevel = @"E"; break;

        case LOG_FLAG_WARN  : logLevel = @"W"; break;

        case LOG_FLAG_INFO  : logLevel = @"I"; break;

        default             : logLevel = @"V"; break;

    }

//Also display the file the logging occurred in to ease later debugging

    NSString *file = [[[NSString stringWithUTF8String:logMessage->file] lastPathComponent] stringByDeletingPathExtension];

//Format the message for the server-side log file parser    

    return [NSString stringWithFormat:@"%@ %x %@ \"%@\" || [%@@%s@%i]", logMessage->timestamp, logMessage->machThreadID, logLevel, msg, file, logMessage->function, logMessage->lineNumber];

}

@end

//-----------------------------------------------------------------------------------------------------------------------

//And in your application:didFinishLaunchingWithOptions:

//Setup logging

    MyFileLogFormatter *fileLogFormatter = [[[MyFileLogFormatter alloc] init] autorelease];

    

    DDFileLogger *fileLogger = [[DDFileLogger alloc] initWithLogFileManager:logFileManager];

    fileLogger.rollingFrequency = 60*60; // 1 hour rolling

    fileLogger.logFileManager.maximumNumberOfLogFiles = 10;

    [fileLogger setLogFormatter:fileLogFormatter];

    

    [DDLog addLogger:fileLogger];

    [fileLogger release];

-- 
Joe Francia

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