Signals and slots
Signals and slots are an integral part of the Qt Framework. So far, we have written some simple but interesting Qt applications, but we haven't handled events. Now it's time to understand how to support events in our application.
Let's write a simple application with just one button. When the button is clicked, check whether we can print something on the console.
The MyDlg.h header demonstrates how the MyDlg class shall be declared:
Figure 5.41
The following screenshot demonstrates how the MyDlg constructor shall be defined to add a single button to our dialog window:
 Figure 5.42
The main.cpp looks as follows:
Figure 5.43
Let's build and run our program and later add support for signals and slots. If you have followed the instructions correctly, your output should resemble the following screenshot:
Figure 5.44
If you click on the button, you will notice that nothing happens, as we are yet to add support for signals and slots in our application. Okay, it's time to reveal the secret...
