log4cpp::SimpleLayout – A Simple Layout for log4cpp logs
Posted by Joys of Programming on in C/C++
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 as simple as calling the constructor SimpleLayout() with no parameter
log4cpp::SimpleLayout::SimpleLayout()
The program below uses the simple layout
#include <stdio.h>
#include <stdlib.h>
#include <log4cpp/category.hh>
#include <log4cpp/OstreamAppender.hh>
#include <log4cpp/SimpleLayout.hh>
using namespace std;
int main()
{
/*Setting up Appender, <span id="IL_AD4">layout</span> and Category*/
log4cpp::Appender *appender = new log4cpp::OstreamAppender("OstreamAppender",&cout);
log4cpp::Layout *layout = new log4cpp::SimpleLayout();
log4cpp::Category& category = log4cpp::Category::getInstance("Category");
appender->setLayout(layout);
category.setAppender(appender);
category.setPriority(log4cpp::Priority::INFO);
category.info("This is for tracing the flow");
category.notice("This is to notify certain events");
category.warn("This is to generate certain warnings");
}
The output of the program is something like this displayed on the standard output
INFO : This is for tracing the flow NOTICE : This is to notify certain events WARN : This is to generate certain warnings
As you can see, this is the simplest layout with no meaningful information like the time it was generated, the hostname of the machine.
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