Loop inside Qthread causes "QThread: Destroyed while thread is still running"?

[zolookas]

Hi, I am new to C++ and Qt and despite that i am thinking of using threads in my app. Here is an example code which outputs "." and then "QThread: Destroyed while thread is still running" error after pressing button.

class MyThread : public QThread
{
	public:
		void run();
};
void MyThread::run()
{
	int connected=0;
	while (connected==0)
	{
		fprintf(stderr,".");
		//Do something that modifies num when usb device is connected
		sleep(5);
	}
}
void MainWindowImpl::on_button_clicked()
{
	MyThread t;
	t.start();
}

class MyThread : public QThread
{
	public:
		void run();
};
void MyThread::run()
{
	int connected=0;
	while (connected==0)
	{
		fprintf(stderr,".");
		//Do something that modifies num when usb device is connected
		sleep(5);
	}
}
void MainWindowImpl::on_button_clicked()
{
	MyThread t;
	t.start();
}

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0
What can be wrong in this code? Am I not allowed to use while loop in thread?