9月19日学习记录

获取Windows系统的UUID

cmd.exe中执行wmic csproduct get uuid

    QProcess p(0);p.start("cmd",QStringList()<<"/c"<<"wmic csproduct get uuid");p.waitForStarted();p.waitForFinished();QString strTemp=QString::fromLocal8Bit(p.readAllStandardOutput());QStringList list=strTemp.split('\n');QString str=list.at(1);str=str.simplified();qDebug()<<str;

获取Windows系统的CPUID

wmic cpu get processorid

    QProcess p(0);p.start("cmd",QStringList()<<"/c"<<"wmic cpu get processorid");p.waitForStarted();p.waitForFinished();QString strTemp=QString::fromLocal8Bit(p.readAllStandardOutput());QStringList list=strTemp.split('\n');QString str=list.at(1);str=str.simplified();qDebug()<<str;

获取系统当前时间

qt -- 获取当前时间 QDateTime、QTime、QDate_currentdatetime_cc_rong的博客-CSDN博客

    QDateTime datetime=QDateTime::currentDateTime();QString str=datetime.toString("yyyy-MM-dd hh:mm:ss");qDebug()<<str;

目标：保存程序第一次运行的时间戳。

先在release目录下创建time.ini,内容如下（我用的release版本）：

[MAIN]
is_first=true
first_using_time=

    QSettings* settings = new QSettings("time.ini", QSettings::IniFormat);settings->beginGroup("MAIN");bool is_first=settings->value("is_first").toBool();if(is_first){QDateTime datetime=QDateTime::currentDateTime();QString str=datetime.toString("yyyy-MM-dd hh:mm:ss");settings->setValue("is_first",false);settings->setValue("first_using_time",str);}settings->endGroup();delete settings;

代码测速

QElapsedTimer-CSDN博客

    QElapsedTimer timer;if(timer.isValid()){qDebug()<<"QElapsedTimer is valid before starting";}else{qDebug()<<"QElapsedTimer is invalid before starting";}timer.start();if (timer.isValid()) {qDebug() << "QElapsedTimer is valid when started";} else {qDebug() << "QElapsedTimer is invalid when started";}for (int i = 0; i < 200000000; i++);qint64 endTime = timer.nsecsElapsed();qDebug() << "Time elapsed:" << endTime << "ns";