Qt5 自定义日志

#include <QLoggingCategory>

#include <QTextStream>

#include <QDateTime>

#include <QFile>

#include <QMutex>

#define LOGFILEMAX 10000

void outputMessage(QtMsgType type, const QMessageLogContext &context, const QString &msg)

{

    static QMutex mutex;

    mutex.lock();

    QString text;

    switch(type)

    {

    case QtDebugMsg:

        text = QString("Debug:");

        break;

    case QtWarningMsg:

        text = QString("Warning:");

        mutex.unlock();

        return;

        break;

    case QtCriticalMsg:

        text = QString("Critical:");

        break;

    case QtFatalMsg:

        text = QString("Fatal:");

    }

    QString context_info = QString("File:(%1) Line:(%2)").arg(QString(context.file)).arg(context.line);

    QString current_date_time = QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss");

    QString message = QString("%1 %2 %3").arg(current_date_time).arg(text).arg(msg);

    QFile file("log.txt");

    file.open(QIODevice::WriteOnly | QIODevice::Append);

    QTextStream text_stream(&file);

    text_stream << message << "\r\n";

    file.flush();

    file.close();

    mutex.unlock();

}

int main(int argc, char *argv[])

{

//    QLoggingCategory::setFilterRules(QStringLiteral("qt.custom.log.debug=false"));

    //注册MessageHandler

    qInstallMessageHandler(outputMessage);

    //打印日志到文件中

    qDebug("This is a debug message");