QT : Passing QString to QThread

Question

I want to pass a QString to a thread.Using this answer, Here is my code: in MainWindow.cpp:

mmthread = new mythread;
        mmthread->start();

        connect(this,SIGNAL(sendtothread(QString)),mmthread,SLOT(getfrom_main(QString)),Qt::QueuedConnection);

        emit sendtothread(mystr);

in mainwindow.h:

signals:
    void sendtothread(QString);

in mythread.cpp:

void mythread::getfrom_main(QString str)
{
    //something
}

in mythread.h:

public slots:
    void getfrom_main(QString);

But it seems getfrom_main is not called at all. Where is my mistake?

EDIT:

I have 3 similar threads like this:

in mythread.cpp:

mythread :: mythread()
{
    moveToThread(this);
}
void mythread::run(){
    //something1
}
void mythread::getfrom_main(QString comm)
{
    comment = comm;
    emit message(comment);
}

in mythread.h:

    class mythread : public QThread
{
    Q_OBJECT
public:
    explicit mythread();
    void run();
signals:
    void message (QString);
private:
       QString comment;
public slots:
    void getfrom_main(QString);
};

something1 always executes in all my threads.but not about getfrom_main.Thanks.

Answer 1

Wrong:

mythread :: mythread()
{
    moveToThread(this); // you don't need to do it
}

Wrong (you really don't need to inherit QThread in your code):

void mythread::run()
{
    //something1
    // after "something" you need to run an event loop:
    exec();
}

exec() will run an event loop that will process all your signals and slots.