Hi every body, I'm trying to make a window and show a time in every 1 minutes. This is what what I wrote to do that:

MyThread .h file:
Qt Code: 
  1. class MyThread : public QThread
  2. {
  3.     Q_OBJECT
  4. private:
  5.     MainWindow *w;
  6.     QTimer *timer;
  7. public:
  8.     MyThread( QObject* parent );
  9.     void run();
  10. public slots:
  11.     void ToDo();
  12. };
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main.cpp
Qt Code: 
  1. MainWindow mw;
  2. MyThread::MyThread( QObject* parent ) : QThread( parent )
  3. {
  4. //    nothing to do !!!
  5. }
  6.  
  7. void MyThread::run()
  8. {
  9.     mw.show();
  10.     timer = new QTimer(this);
  11.     connect(timer,SIGNAL(timeout()), this, SLOT(ToDo()));
  12.     timer->setInterval(2009);
  13.     timer->start();
  14.     return a.exec();
  15. }
  16. void MyThread::ToDo() {
  17.     long i=0,h=0,m=0,s=0;
  18.     while(i<3)
  19.     {
  20.         std::string str = "Time: ";
  21.         char msg[100];
  22.         Converter(gTime,h,m,s);
  23.         sprintf(msg,"%02ld:%02ld:%02ld",h,m,s);
  24.         str += msg;
  25.         w->setText(QString::fromUtf8(str.c_str(),str.size()));
  26.         sleep(1);
  27.         i++;
  28.         gTime--;
  29.     }
  30.     a.closeAllWindows();
  31. }
  32.  
  33. int main()
  34. {
  35.     MyThread mt(0);
  36.     mt.start();
  37.     mt.wait();
  38. }
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It is compiled but this is the error when I try to execute the program:

QObject: Cannot create children for a parent that is in a different thread.
(Parent is MyThread(0xbfbc4cac), parent's thread is QThread(0x80843a0), current thread is MyThread(0xbfbc4cac)
Thanks for your consideration