How to direct logs to multiple log files (destinations) – log4cpp
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 ConfigureFailure
log4cpp programs can be configured using configuration files. But while using log4cpp configurations, you may come across various errors. These can be tracked using log4cpp::ConfigureFailure. See the following program how the missing file error is caught. #include <stdio.h> #include <stdlib.h> #include <log4cpp/Category.hh> #include <log4cpp/PropertyConfigurator.hh> #include <log4cpp/Configurator.hh> using namespace std; int main() { /*Setting up Appender, [...]
log4cpp: Logging Events and Priorities
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
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::PropertyConfigurator – Configure with configuration files
log4cpp can also be configured with the configuration files. log4cpp::PropertyConfigurator can be used for this purpose. It has a single function which takes as input the configuration file. void configure (const std::string &initFileName) Simply specify the configuration in a file. You must specify the layout, priority and the appender in the configuration file as shown [...]
Create your own Log format with log4cpp::PatternLayout
log4cpp::PatternLayout supports four different patterns of log format. But it also supports user specified format. For this purpose, it gives certain format chracters. Some of them are %d: Date %m: log message %n: line separator %p: priority For more such characters refer PatternLayout. The additional benefit of using a format of your own is that [...]
How to install log4cpp from sources?
log4cpp is used for logging purposes in C++. To install log4cpp in Linux is as simple as installing some simple packages like liblog4cpp5 and liblog4cpp5-dev. But if you want to install log4cpp from sources, you need to follow the following procedures. Using these steps, you can easily install log4cpp in Mac and Linux (or any [...]