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The only part missing from the project file now is the main function. In Listing 2-10, you can see the implementation. First, a QApplication object is created; then the list dialog is created. The dialog is then shown before the exec method of the application is called. Calling exec means that the QApplication object starts to process system events and passes them on to the appropriate QObject instances the application is event-driven. The function returns as soon as all windows and dialogs have been closed, so when you close the list dialog, exec returns, and the application reaches its end. Listing 2-10. Editing an item of the list int main( int argc, char **argv ) { QApplication app( argc, argv ); ListDialog dlg; dlg.show(); return app.exec(); } Looking back at the list of user actions that you want the user to be able to perform, you can see that most actions are represented by a connection. The connection can either be made in Designer or by using the connect call in a dialog class constructor. The final push to get the application going is the main function. Its job is to show the list dialog and to start the event loop. To test the application, start by running qmake on the project file you started with to generate a Makefile. Now build the application using make or your system s equivalent, which should generate an executable for you. In Figure 2-28, I am trying out the application for the very first time and it looks as if everything is working. The application is not very useful because it cannot save and load data. The user interface is fully functional, however.

As before, my operating system uses the special IP address 0.0.0.0 to mean accept connections on any interface, but that may vary with operating system, and Python hides this fact by letting you use the empty string instead.

Summary

A mashup is the evolution of the way web applications are made: it allows a programmer to integrate products and services from competing companies like Microsoft, Google, Amazon, and Yahoo to create new, unique products and services, as illustrated in Figure 1-1. These new products and services integrate APIs published by each company using web technologies that have evolved over the history of the web applications. We will look at these technologies in more detail later on in the chapter.

The term deadlock is used for all sorts of situations in computer science where two programs, sharing limited resources, can wind up waiting on each other forever because of poor planning It turns out that it can happen fairly easily when using TCP I mentioned previously that typical TCP stacks use buffers, both so that they have somewhere to place incoming packet data until an application is ready to read it, and so that they can collect outgoing data until the network hardware is ready to transmit an outgoing packet These buffers are typically quite limited in size, and the system is not generally willing to let programs fill all of RAM with unsent network data After all, if the remote end is not yet ready to process the data, it makes little sense to expend system resources on the generating end trying to produce more of it.

This chapter showed the two classes of dialogs available in Qt applications: active or passive; intelligent or dumb. The list dialog contains a slot for each action that the user can perform. This is called an active or intelligent dialog. Any dialog requiring anything but the simplest possible input from the user is good to make active. Small active elements can make a dialog very much easier to use. The editing dialog does not contain any slots; it simply relies on the intelligence built into the widgets used and the accept and reject slots. This is enough for very simple dialogs, in which the user can fill out fields of different types. This is called a passive or dumb dialog. It is quite common to have a few passive dialogs in an application; in fact, the application does not work without them. Even though the editing dialog is passive toward the user, it does not have to be passive toward the developer you. The editing dialog nicely hides the actual implementation of the graphical user interface using the name and number properties. This made it possible to keep the ui variable private at the cost of a few lines of trivial code. By doing this, you ensure that the UI can be changed without changing the code using the editing dialog. Separating the UI and the code of the application usually helps when maintaining and extending the application in the future.

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