Thanks !! I just figured it out after reading Docs !!

Thanks for replying (y)

You have a list of examples here

Now i got another question. I tried using QNetworkConfigurationManager.

If connection situation changes program succesfully sends a signal. The signal is onlineStateChanged(bool)

If i use QNetworkConfigurationManager::isOnline() function inside a constructor. It fails. Maybe a bug?

Here is my code inside constructor :

networkConfigurationManager = new QNetworkConfigurationManager(this); // If there is network connection, close the program if(networkConfigurationManager->isOnline() == true) { this->close(); }

Ok, I found the problem. I need to rebuild QCA library.