I am writing a program for control of a machine using serial port. At one point, I am required to run a process on another thread. For implementing the same I am following the tutorial given here.
http://mayaposch.wordpress.com/2011/...l-explanation/


My application is a GUI based application. The serial port and its functions are being handled by a separate class which has a port object (using qextserialport library). This port object is opened and closed at the start and ending of the application.
Here, when I press one button on the FORM, I require to start a thread that will monitor the serial port for a particular input and execute a slot when the input is recieved from the serial port.
Following is excerpts from the code written when the button is pressed.

QThread*thread=newQThread;

ports->moveToThread(thread);

connect(thread,SIGNAL(started()),ports,SLOT(start()));

connect(ports,SIGNAL(dataFound(QString)),this,SLOT(ondatafound(QString)));

connect(ports,SIGNAL(finished()),thread,SLOT(quits()));


connect(ports,SIGNAL(finished()),ports,SLOT(deleteLater()));

connect(ports,SIGNAL(finished()),thread,SLOT(deleteLater()));

thread->start();
Here, the ports (Worker) class is the class which is controlling all the functions related to the serial port.
Here, the start slot executes a Qtimer that reads the serial port after a timeout till the required data is not received. And after receiving data, emits the datafound signal and also emits the finished signal.



This works for one time execution. However, when I press the Button again for re-executing which I am required to do again and again, after the ondatafound slot is executed, The QT gives an error and does not execute the movetothread.


What I see in the tutorial is that a new instance of the worker class is created and movetothread is called and I am not doing it that way... but dont know the right way of doing it either for the thing to work.

Secondly, I also need to have a provision of terminating this thread from the main thread in case I do not receive the data. So if i dont include the data from the serial port, then i need to push another button and continue the process further. I dont know how to terminate this thread from the main thread.