Log4Qt的一个强大之处在于可以把log同时记录到不同地方，可以是文件、终端和数据库等等，这里介绍如何把log4qt的log记录输出到一个窗口，输出到其他地方也类似。 主要是继承Log4Qt::AppenderSkeleton重新实现里面的几个虚函数。 - #ifndef LOGVIEW_H
#define LOGVIEW_H
class QTextBrowser;
/*! \brief root::LogView
\author Wang Bin <[email]wbsecg1@gmail.com[/email]>
\version 0.01
\date 2011.08.03
Log信息显示窗口。
*/
class LogView : public QWidget
{
Q_OBJECT
LOG4QT_DECLARE_QCLASS_LOGGER
public:
LogView(QWidget *parent = 0);
QTextBrowser *view() const {return mView;}
public slots:
void appendLog(const QString &pMessage);
private:
QMutex mMutex;
QTextBrowser *mView;
};
class LogViewAppender : public Log4Qt::AppenderSkeleton
{
Q_OBJECT
public:
LogViewAppender(QObject *pParent = 0);
~LogViewAppender();
signals:
void OnMessageAppend(const QString& msg);
protected:
virtual bool requiresLayout() const;
virtual void append(const Log4Qt::LoggingEvent &rEvent);
#ifndef QT_NO_DEBUG_STREAM
virtual QDebug debug(QDebug &rDebug) const;
#endif //QT_NO_DEBUG_STREAM
private:
LogView *mLogView;
};
#endif // LOGVIEW_H
- #include "logview.h"
#include <QtCore/QDebug>
#include <QtGui/QTextBrowser>
#include <QtGui/QLayout>
LogView::LogView(QWidget* parent)
:QWidget(parent)
{
QVBoxLayout *vlayout = new QVBoxLayout;
setLayout(vlayout);
qRegisterMetaType<QTextCursor>("QTextCursor");
mView = new QTextBrowser(this);
vlayout->addWidget(mView);
showMaximized();
}
void LogView::appendLog(const QString &pMessage)
{
QMutexLocker lock(&mMutex);
//QString msg = pMessage.trimmed();
//mView->append(msg);
mView->insertPlainText(pMessage);
mView->moveCursor(QTextCursor::End);
mView->ensureCursorVisible();
}
LogViewAppender::LogViewAppender(QObject *parent) :
Log4Qt::AppenderSkeleton(parent),mLogView(NULL)
{
}
LogViewAppender::~LogViewAppender()
{
if (mLogView) {
mLogView->close();
mLogView = NULL;
}
}
bool LogViewAppender::requiresLayout() const
{
return true;
}
void LogViewAppender::append(const Log4Qt::LoggingEvent &rEvent)
{
Q_ASSERT_X(layout(), "LogViewAppender::append()", "Layout must not be null");
QString message(layout()->format(rEvent));
emit OnMessageAppend(message);
/*if (!mLogView) {
mLogView = new LogView;
}
mLogView->show(); //
mLogView->appendLog(message);*/
}
#ifndef QT_NO_DEBUG_STREAM
QDebug LogViewAppender::debug(QDebug &rDebug) const
{
return rDebug.space();
}
#endif //QT_NO_DEBUG_STREAM
- bool InitializeLog4QtView(LogView *widget)
{
Log4Qt::Logger *logger = Log4Qt::Logger::rootLogger();
LogViewAppender *viewappender = new LogViewAppender;
viewappender->setName("ViewAppender");
Log4Qt::TTCCLayout *viewlayout = new Log4Qt::TTCCLayout(Log4Qt::TTCCLayout::ISO8601);
viewlayout->setThreadPrinting(true);
viewappender->setLayout(viewlayout);
viewappender->activateOptions();
logger->addAppender(viewappender);
QObject::connect(viewappender, SIGNAL(OnMessageAppend(QString)), widget, SLOT(appendLog(QString)));
return true;
}
bool FinalizeLog4Qt()
{
Log4Qt::Logger *logger = Log4Qt::Logger::rootLogger();
logger->removeAllAppenders();
return true;
}
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