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Thread: Using Log4QT

  1. #1
    Join Date
    Nov 2009
    Qt products

    Default Using Log4QT

    I'm new to Qt programming,
    I would like to use Log4Qt as log framework.
    I downloaded related source code, I compiled it as qt library in visual studio 2008.
    Now I have a static library .lib to use in my QT project.
    I'm not able to link this lib to new QT project.
    Log4Qt usage instruction doesn't seem to work.
    Someone can tell me te exact steps to use Log4QT?
    There is another way to log in QT?

    Can anyone help me?
    Thank in advance!

  2. #2
    Join Date
    Apr 2010
    Thanked 3 Times in 1 Post
    Qt products
    Qt4 Qt/Embedded
    MacOS X Unix/X11 Windows

    Default Re: Using Log4QT

    Hi gpuntoni, perhaps is a little bit late for the answer, but I guess would be useful for new readers that stop by this forum. I don't use log4Qt as a library in my Qt projects, I just include the *.pri file that comes in the log4Qt source folder, but I'll explain how I did it in case that will help you.

    1. Download log4Qt from:
    2. In your project add the line: include(/locationOfYourLog4QtFolder/src/log4qt/log4qt.pri). Look at the line 12 of my .pro file:
    Qt Code:
    1. #-------------------------------------------------
    2. #
    3. # Project created by QtCreator 2010-12-08T08:17:29
    4. #
    5. #-------------------------------------------------
    7. QT += core gui
    9. TARGET = testLog4Qt
    10. TEMPLATE = app
    12. include(/locationOfYourLog4QtFolder/src/log4qt/log4qt.pri)
    14. SOURCES += main.cpp\
    15. dialog.cpp
    17. HEADERS += dialog.h
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    That will include in your project all the source files necessary to work with Log4Qt.
    3. Just add your log4Qt code anywhere in your code:
    Qt Code:
    1. #include "log4qt/consoleappender.h"
    2. #include "log4qt/logger.h"
    3. #include "log4qt/ttcclayout.h"
    4. #include "log4qt/logmanager.h"
    6. Dialog::Dialog( QWidget *parent ) : QDialog( parent )
    7. {
    8. Log4Qt::LogManager::rootLogger();
    9. Log4Qt::TTCCLayout *p_layout = new Log4Qt::TTCCLayout();
    11. p_layout->setName(QLatin1String("My Layout"));
    12. p_layout->activateOptions();
    13. // Create an appender
    14. Log4Qt::ConsoleAppender *p_appender = new Log4Qt::ConsoleAppender(p_layout, Log4Qt::ConsoleAppender::STDOUT_TARGET);
    15. p_appender->setName(QLatin1String("My Appender"));
    16. p_appender->activateOptions();
    17. // Set appender on root logger
    18. Log4Qt::Logger::rootLogger()->addAppender(p_appender);
    20. Log4Qt::Logger::logger(QLatin1String("My Logger"))->info("Hello World!");
    21. }
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    4. Now compile your project and it's done. You will see in your Applicatin Output (Alt+3):
    Qt Code:
    1. Starting /home/user/Documents/Qt_Projects/testLog4Qt/testLog4Qt-build-desktop/testLog4Qt...
    2. 99 [] INFO My Logger - Hello World!
    3. /home/user/Documents/Qt_Projects/testLog4Qt/testLog4Qt-build-desktop/testLog4Qt exited with code 0
    To copy to clipboard, switch view to plain text mode 

    Note: If you wish you can use the using namespace Log4Qt, but I'm more the kind of guy that use Log4Qt:: or std::, look at:

  3. The following 3 users say thank you to Netheril for this useful post:

    eumel1990 (31st May 2011), Ricardo_arg (6th November 2012), SirDodger (9th February 2011)

  4. #3
    Join Date
    Jan 2016
    Qt products
    MacOS X Unix/X11 Windows Android

    Talking Re: Using Log4QT

    Thanks this was exactly what I was looking for.

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