QT : Passing QString to QThread - c++

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.