..bits & bytes teleported

Appenders, Loggers and Layout are the main components of the Apache log4cxx API which work together to expose a logging API to be used in C++ programs. (http://logging.apache.org/log4cxx/index.html)

To design a simple C++ application which logs to a file, you will have to: (http://logging.apache.org/log4cxx/apidocs/index.html)

1. Create a layout (SimpleLayout)

2. Create an appender (FileAppender) with the above layout

3. Create a logger and add the above appender

4. use the macros to log a message

#include <log4cxx/logstring.h>
#include <stdlib.h>
#include <log4cxx/logger.h>
#include <log4cxx/helpers/exception.h>
#include <log4cxx/logger.h>
#include <log4cxx/fileappender.h>
#include <log4cxx/simplelayout.h>


#include <iostream.h>

using namespace std;

using namespace log4cxx;
using namespace log4cxx::helpers;


int main() {
    //setlocale(LC_ALL, "");
    int result = EXIT_SUCCESS;
    try {
        // Create a basic configuration

        //        BasicConfigurator::configure();

        // Create a SimpleLayout

        log4cxx::LayoutPtr layout(new log4cxx::SimpleLayout());

        // Create a new appender with the created layout
        // Here we create a 'appender' to output to a FILE, instead of the 'console'.
        // Here it outputs the logs to a file 'log.txt'

        log4cxx::FileAppenderPtr appender(new log4cxx::FileAppender(layout, "log.txt", true));

        // Create a new Logger with the name: 'MyLogger'

        LoggerPtr mylogger = Logger::getLogger("MyLogger");

        // Set Level for the new logger created

        mylogger->setLevel(log4cxx::Level::getInfo());

        // Add the appender to the 'logger' object created

        mylogger->addAppender(appender);

        // Logging request via macro

        LOG4CXX_INFO(mylogger, "Trying out the Apache log4cxx API");



    } catch (std::exception& ) {

        result = EXIT_FAILURE;
    }

    return result;
}

INFO - Trying out the Apache log4cxx API