Joys of Programming » log4cpp examples

How to direct logs to multiple log files (destinations) – log4cpp

Joys of Programming — Fri, 15 Jan 2010 14:23:54 +0000

log4cpp can not only be used to log the events to a log file or standard output, but also helps you to log events to multiple destinations. For this purpose, either you can add multiple appenders to a single category or make use of multiple Categories. We will explore the first options. With this option, [...]

log4cpp: Logging Events and Priorities

Joys of Programming — Thu, 14 Jan 2010 06:50:42 +0000

The most important aspect of a log message is its priority. Take a simple scenario, when you are debugging your program, you want to display all the logs in your program. At that moment, you are not concerned about the resource crunch and performance impact. But when your program is running, you do not want [...]

log4cpp Category

Joys of Programming — Thu, 14 Jan 2010 06:44:50 +0000

Every log message has a priority. But depending on the scenario we decide whether we need to log a message or not. Like every message has a priority, similarly every scenario has a priority. We have the following priorities arranged in the descending order. EMERG, FATAL ALERT CRIT ERROR WARN NOTICE INFO DEBUG NOTSET (no [...]

log4cpp::PatternLayout – Available log4cpp log formats

Joys of Programming — Thu, 14 Jan 2010 06:38:31 +0000

log4cpp supports three layouts: Simple Layout, Basic Layout and PatternLayout. Simple and Basic Layout are the simplest ones and you need not configure them in any way. The display the log in a fixed format. log4cpp::PatternLayout has the additional advantage that it supports four different formats and provides a mechanism to create a format of [...]

log4cpp::SimpleLayout – A Simple Layout for log4cpp logs

Joys of Programming — Wed, 13 Jan 2010 13:54:05 +0000

log4cpp supports three different Layouts, one of which is the SimpleLayout. log4cpp::SimpleLayout has the following format for every log message priority message where priority is one of the different values like DEBUG, WARN, NOTICE, INFO, CRIT, ERROR and the message is the same as the string which you want to print. Initializing a SimpleLayout is [...]

log4cpp::Layout – Deciding on the Layout of Logs

Joys of Programming — Wed, 13 Jan 2010 13:33:59 +0000

log4cpp helps you to decide on the Layout of the logs. The layout of a log means the format according to which you want to display a message depending on the logging event. log4cpp supports the following Layouts Simple Layout Basic Layout Pattern Layout You can even make a Layout of your own. Making a [...]

Configuring log4cpp (Simple)

Joys of Programming — Tue, 12 Jan 2010 14:20:35 +0000

If you want to see how log4cpp works with the basic configuration, there is a log4cpp::BasicConfigurator. It adds a FileAppender which logs the output to standard output and uses a BasicLayout. On executing this program, you will get the following output on the terminal

Log4cpp::StringQueueAppender – Manipulating the log4cpp logs

Joys of Programming — Tue, 12 Jan 2010 14:07:35 +0000

log4cpp logs can be directed to files, standard output, back up files or even to the System Log. But before moving to discussing about log4cpp::StringQueueAppender, I would like to present certain scenarios or use cases of StringQueueAppender. You do not want to actually print the log files, but simply want to count certain occurrences of [...]

OstreamAppender: Direct the log4cpp logs to standard Output

Joys of Programming — Mon, 11 Jan 2010 13:50:13 +0000

log4cpp enables you to easily log important events. The logs can be directed to files or even periodically rolled back and back up. There are multiple destinations for the log files and you can decide which one to choose from. Though in most cases, you want to use log files, you can also make use [...]

log4cpp::RollingFileAppender – How to Backup and Roll Over log files?

Joys of Programming — Mon, 04 Jan 2010 18:16:43 +0000

It is very important to log the events in your software both for analytics and debugging. Log4cpp is helpful for logging in with C++. Log4Cpp::File Appender can be used to direct the output of logs to a file. But there are certain challenges that you may face while using log files The files can soon [...]