Qt练习--记录日志文件

1、提供记录日志文件

2、逻辑处理

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();
}

int main(int argc, char *argv[])
{
    qInstallMessageHandler(outputMessage);
    /*所有使用方法*/
/*
    qDebug("This is a debug message");
    qWarning("This is a warning message");
    qCritical("This is a critical message");
    qFatal("This is a fatal message");
*/
    QApplication a(argc, argv);
    Dialog w;
    if (w.exec() == QDialog::Accepted)
    {
        w.show();
        return a.exec();
    }

}

使用方法：

char cmd[256]={'\0'};
            sprintf(cmd,"copy %s DB2.rar",filenameChar);
            ret = system(cmd);
            if (ret < 0)
            {
                qFatal("copy to DB.rar fail");
            }
            ret = system("Rar.exe e DB2.rar");
            if (ret < 0)
            {
                qFatal("unrar DB.rar fail");
            }
            ret = system("del DB2.rar");
            if (ret < 0)
            {
                qFatal("del DB.rar fail");
            }
            qDebug("process sucess");