log4cpp::PropertyConfigurator – Configure with configuration files
Posted by Joys of Programming on in C/C++
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 here
log4j.rootCategory=DEBUG, rootAppender log4j.appender.rootAppender=org.apache.log4j.ConsoleAppender log4j.appender.rootAppender.layout=org.apache.log4j.BasicLayout
You can read here for more on configuration.
Check the following program and how the configuration file is used
#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, layout and Category*/
try {
log4cpp::PropertyConfigurator::configure("/home/user/config");
}
catch (log4cpp::ConfigureFailure e) {
cout<<"Log4cpp Error: "<<e.what()<<endl;
}
log4cpp::Category& category = log4cpp::Category::getInstance("Category");
category.info("This is for tracing the flow");
category.notice("This is to notify certain events");
category.warn("This is to generate certain warnings");
}
As you have seen, the values in the configuration file tells the PropertyConfigurator to use the console as appender.
1263575757 INFO Category : This is for tracing the flow 1263575757 NOTICE Category : This is to notify certain events 1263575757 WARN Category : This is to generate certain warnings
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