Qt---打印系统时间，毫秒级

 //获取当前时间

    QDateTime current_date_time = QDateTime::currentDateTime();

    QString current_date = current_date_time.toString("yyyy-MM-dd");

    QString current_time = current_date_time.toString("hh:mm:ss.zzz ");

  time_t rawtime;

    time (&rawtime);

    struct tm * timeinfo = localtime(&rawtime);

    const int buflen = 32;

    char buffer[buflen] = {0};

    strftime(buffer, buflen, "%Y%m%d%H%M%S", timeinfo);

 const QString strFlag = buffer;