QThread & QTimer

**hosseinyounesi** · 11th April 2009, 15:30

mmmmmmm, I don't know !!!!!
This is what I exactly want to do:

Program starts and shows a timer for 5 seconds. Then it hides or closes and after 10 minutes shows the same. What I have to do?

I tried to make a QThread and show the mainwindow, then set a QTimer, it has to change the text of a label for a 5 second timer.

Any better way?!

**wysota** · 11th April 2009, 19:10

You don't need the thread. The timer will let you know when a specified amount of time has passed. Here is a sample code:

Qt Code:

Switch view

#include <QApplication>                
#include <QLabel>                      
#include <QTimer>                      
#include <QDateTime>                   
 
class Dummy : public QObject {
  Q_OBJECT
public:
  Dummy(QLabel *l) : QObject(){m_label = l; }
public slots:
  void doIt(){ m_label->setText(QDateTime::currentDateTime().toString()); }
private:
  QLabel *m_label;
};
 
#include "main.moc"
 
int main(int argc, char **argv){
  QApplication app(argc, argv);
  QLabel label;
  QTimer t;
  Dummy dummy(&label);
  dummy.doIt();
  QObject::connect(&t, SIGNAL(timeout()), &dummy, SLOT(doIt()));
  t.start(1000);
  label.show();
  return app.exec();
}

#include <QApplication>                
#include <QLabel>                      
#include <QTimer>                      
#include <QDateTime>                   

class Dummy : public QObject {
  Q_OBJECT
public:
  Dummy(QLabel *l) : QObject(){m_label = l; }
public slots:
  void doIt(){ m_label->setText(QDateTime::currentDateTime().toString()); }
private:
  QLabel *m_label;
};

#include "main.moc"

int main(int argc, char **argv){
  QApplication app(argc, argv);
  QLabel label;
  QTimer t;
  Dummy dummy(&label);
  dummy.doIt();
  QObject::connect(&t, SIGNAL(timeout()), &dummy, SLOT(doIt()));
  t.start(1000);
  label.show();
  return app.exec();
}

To copy to clipboard, switch view to plain text mode