QtConcurrent::map Сan't use QVector from class

[Mikee]

Hi.
In the file main.cpp I need start void StrategyCod1(double) in 4 thread:

void StrategyCod1(double Parametr)
{ 
    QMutex Mutex;
    Mutex.lock();
    MainWindow w;
    QVector<double> Open=w.Open;
    Mutex.unlock();
    int NMA=Parametr;
    qDebug()<<NMA;
}
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;   
    QVector<double> Perebor; //перебор первого значения стратегии
    for (double i=5;i<1000;i=i+3)
    {
        Perebor.append(i);
    }
    QFuture<void> Perebor2 = QtConcurrent::map(Perebor, StrategyCod1);
    return a.exec();
}

But when I run the program stops. Error in call MainWindow w.
How do I use QVector from class MainWindow?

[SGaist]

Hi and welcome to devnet,

What exactly do you want to achieve ?

In any case, your MainWindow variable in StrategyCod1 is local and will be destroyed at the end of the function.