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The first instance of a signal you have encountered was in Listing 2-2. The GtkWindow was connected to the destroy() callback function. This function will be called when the destroy signal is emitted. g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (destroy), NULL); GTK+ emits the destroy signal when gtk_widget_destroy() is called on the widget or when FALSE is returned from a delete_event() callback function. If you reference the API documentation, you will see that the destroy signal belongs to the GtkObject class. This means that every class in GTK+ inherits the signal, and you can be notified of the destruction of any GTK+ structure.

protected void Application_Start() { // ... RegisterRoutes(RouteTable.Routes); ControllerFactory.GetInstance = type => ObjectFactory.GetInstance(type);

In addition to technical approaches to determine how programs work, an attacker might also be able to blackmail or buy off insiders. An insider is an individual who works for the organization that builds the software, such as a software developer within a company. If the organization does not pay its software developers very well, you can imagine that it may not take much money to convince them to sell the secrets of how their organization s software works. Alternatively, if the software developer happens to have some skeletons in his closet, the attacker may be able to threaten the secrets off of him. Through a combination of technical and nontechnical approaches, such as fault injection and blackmail, respectively, a determined attacker will eventually be able gather enough information to reverse engineer a product. For all the reasons just given, it does not necessarily always make sense to assume that one can keep products and information systems secure simply by keeping information about how those systems work hidden. If you want your systems to be more secure, you may want to assume that the attacker knows exactly how the target system works. We suggest that you avoid solely practicing security by obscurity if better options exist. What you will discover in s 12 and 13 is that it is possible to design a secure system in which the design can be completely known to the public even to the attackers. In such a system, its security does not depend upon hiding the design details or the code from the attackers, but instead it depends on keeping certain keys secret.

There are four parameters to every g_signal_connect() call The first is the widget that is to be monitored for the signal Next, you specify the name of the signal you want to track Each widget has many possible signals, all of which can be found in the API documentation Remember that widgets are free to use the signals of their ancestors, since each widget is actually an implementation of each of its ancestors You can use the Object Hierarchy section of the API to reference parent classes gulong g_signal_connect (gpointer object, const gchar *signal_name, GCallback handler, gpointer data); When typing the signal name, the underscore and dash characters are interchangeable They will be parsed as the same character, so it does not make any difference which one you choose I will use the underscore character for all of the examples in this book.

ControllerBuilder.Current. SetControllerFactory(new ControllerFactory()); }

The third parameter in g_signal_connect() is the callback function that will be called when the signal is emitted, cast with G_CALLBACK() The format of the callback function depends on the function prototype requirements of each specific signal An example callback function is shown in the next section The last parameter in g_signal_connect() allows you to send a pointer to the callback function In Listing 2-2, we passed NULL, so the pointer was void, but let us assume for a moment that we wanted to pass the GtkLabel to the callback function In this instance of g_signal_connect(), the GtkLabel was cast as a gpointer, which will be passed to the callback function A gpointer is simply a type definition of a void pointer You can recast this in the callback function, but g_signal_connect() requires a gpointer type.

In listing 19.7 we first set the controller factory s static factory function B to the IoC tool s automatic factory method. To use our custom controller factory, we then call the SetControllerFactory method on the ControllerBuilder to replace the default controller factory with our own C. Now our controller factory will use our IoC tool to instantiate controllers, our custom invoker, and any action filters. Finally, we use a special interface and abstract base class to denote the action filters we want to apply. This is shown in listing 19.8.