QT关于程序运行日志

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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:");        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 ddd");    QString current_date = QString("(%1)").arg(current_date_time);    QString message = QString("%1 %2 %3 %4").arg(text).arg(context_info).arg(msg).arg(current_date);    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();}

main函数中添加;

qInstallMessageHandler(outputMessage);

//这样就在程序的当前目录建立了log.txt记录程序运行的日志

//注意，Qmessagebox事件会被锁住

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