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The GLib Object System (GObject) was originally a part of the GTK+ 1 library in the form of the GtkObject class With the release of GTK+ 20, it was moved into its own library, distributed along with GLib GObject is often criticized for its complexity, since its APIs can seem extremely drawn out However, it was originally created to allow easy access to C objects from other programming languages The ability to easily access C objects from other languages facilitates the large variety of bindings available for other programming languages, even though it is implemented in C This is so difficult because each programming language provides a different approach to data types, whether the differences appear on the surface or the internals of each language For example, in C, you have data types including char, long, and integer.

4 5 6

Other languages, such as Perl, do not have similar data types, since the type of each object is decided by how it is used GObject gets around these limitations, the drawback being that deriving new objects is a convoluted process GObject also implements a fully featured object-oriented interface in C, which will be covered in detail throughout this section and the rest of this book This system is the base for the GTK+ widget hierarchical structure as well as for many of the objects implemented in GTK+ s supporting libraries GObject s object-oriented interface is implemented in part by a generic, dynamic type system called GType GType allows programmers to implement many different dynamic data types through singly-inherited class structure A singly-inherited class is an object hierarchy where each child class can only be derived directly from a single parent class.

We have chosen the value of the token such that it is effectively unguessable. The token value is the output of a cryptographically strong MAC computation, which means that the attacker would need billions of attempts to guess the correct value with any reasonable probability (the specific numbers depend on the MAC function and the quality of the key material). Note that each guess has to be carried out from within the user s browser, (i.e., the malicious page would have to implement a loop in JavaScript that iterates over the guessed values of the token, which would likely reduce the attack rate to a few tens per second far slower than the rate usually assumed for offline attacks against cryptographic algorithms).

There s a new kind of URL in table 16.3 that we haven t yet discussed. The URL in route 4 isn t designed to be seen by the user it s linked via form posts. After the action has processed, it immediately redirects and the URL is never seen on the address bar. In cases like this, it s still important for the URL to be consistent with the other routes defined in the application. So, how do we add a route

This will be discussed in more detail in 2, after you are introduced to GTK+ widgets Along with the ability to create extensible data types, GObject provides programmers with many nonclassed (or fundamental) data types A nonclassed data type is a root class from which others are derived It is important to note that the root class is not derived from any other classes itself Table 1-1 provides a list of the most important nonclassed data types The GType macro, C variable descriptor, and a description is shown for each, along with its range if applicable Table 1-1 Standard GObject Nonclassed Data Types.

Finally, it s time to start implementing the routes that we ve designed. We ll tackle the static routes first, which are the first two listed in table 16.3. Route 1 in our schema is handled by our route defaults, so we can leave that one exactly as is. The first route that we ll implement is number 2, which is a purely static route. Let s look at it in listing 16.4.

The spin button widget allows the user to select an integer or floating-point number by incrementing or decrementing with the up or down arrows. The user can still type in a value with the keyboard, and it will be displayed as the nearest acceptable value if it is out of range. Figure 4-6 shows two spin buttons in action that display an integer and a floating-point number.