QT Log4Qt

源码引用log4Qt 

参考网站： https://developer.aliyun.com/article/804837 

1. 下载最新的源码1.5.1：https://github.com/MEONMedical/Log4Qt

下载下来解压后只需要留下：

a. build.pri

b. g++.pri

c. src 目录

2. 在自己的工程pro文件中引用log4qt子工程

#################日志库的引入########################
##https://github.com/MEONMedical/Log4Qt
include($$PWD/Log4Qt-1.5.1/src/log4qt/log4qt.pri)
include($$PWD/Log4Qt-1.5.1/build.pri)
include($$PWD/Log4Qt-1.5.1/g++.pri)
QT          += concurrent
DEFINES     += LOG4QT_LIBRARY
DEFINES     += LOG4QT_EXPORT
INCLUDEPATH += Log4Qt-1.5.1/src/
INCLUDEPATH += Log4Qt-1.5.1/src/log4qt
DEPENDPATH  += Log4Qt-1.5.1/src/log4qt
###################################################

3. 修改一处编译错误Log4Qt-1.5.1/src/log4qt/dailyfileappender.cpp 添加头文件引用

#include <QStringBuilder>

 4. 代码配置控制台日志输出：

#include "mainwindow.h"

#include <QApplication>
#include <QStandardPaths>
#include <QDir>

#include "logmanager.h"
#include "propertyconfigurator.h"
#include <consoleappender.h>
#include <dailyrollingfileappender.h>
#include <ttcclayout.h>
#include <patternlayout.h>
#include <QDebug>
#include <QTextCodec>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    Log4Qt::PropertyConfigurator::configure("log.conf");
    Log4Qt::LogManager::setHandleQtMessages(true);

    Log4Qt::Logger *logger = Log4Qt::Logger::rootLogger();
    Log4Qt::PatternLayout *layout = new Log4Qt::PatternLayout();
    layout->setName("PatternLayout");
    layout->setConversionPattern("%d{yyyy-MM-dd HH:mm:ss.zzz} [%p] %m%n");
    layout->activateOptions();

    // show log at the output window
    Log4Qt::ConsoleAppender *appender = new Log4Qt::ConsoleAppender();
    appender->setName("ConsoleAppender");
    appender->setLayout(layout);
    appender->setEncoding(QTextCodec::codecForName("UTF-8"));
    appender->setTarget(Log4Qt::ConsoleAppender::STDOUT_TARGET);  // write log to stdout
    appender->setImmediateFlush(true);
    appender->setThreshold(Log4Qt::Level::ALL_INT);  // output all log
    appender->activateOptions();

    // add appender
    logger->addAppender(appender);

    logger->setLevel(Log4Qt::Level::ALL_INT);

    qDebug() << ("new log");
    qInfo() << ("new log");
    qWarning() << ("new log");
    qCritical() << ("new log");

    MainWindow w;
    w.show();
    int ret = a.exec();

    return ret;
}

5. 配置文件log.conf配置日志输出到文件：

log4j.rootLogger=ALL, daily

log4j.appender.daily=org.apache.log4j.DailyRollingFileAppender
log4j.appender.daily.file=app.log
log4j.appender.daily.appendFile=true
log4j.appender.daily.datePattern=yyyy-MM-dd.log
log4j.appender.daily.layout=org.apache.log4j.PatternLayout
log4j.appender.daily.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss.zzz} %p:%m%n

6. 在工程文件pro里添加将log.conf拷贝到输出目录

DISTFILES += \
    log.conf

logconf.commands = $(COPY_DIR) \"$$replace(PWD, /, \\)\log.conf\" \"$$replace(OUT_PWD, /, \\)\"
first.depends += $(first) logconf
export(first.depends)
export(logconf.commands)
QMAKE_EXTRA_TARGETS += first logconf

到此结束。