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Qt makes handling plugins easy. It is possible to extend Qt to handle custom database drivers, image formats, and even window decoration styles by inheriting and implementing an interface class. You can also extend your own applications with plugins, either by letting Qt handle the plugin interface or through a low-level interface. If you need to interface plugins made for other applications or defined according to a standard, you can use the QLibrary class for a low-level access to DLLs. This class makes it possible to interface almost any code. It is easier to let Qt handle the plugins through the QPluginLoader class in combination with the Q_DECLARE_INTERFACE, Q_EXPORT_PLUGIN, and Q_INTERFACES macros and the QObject class. When creating new plugin interfaces, it is important to build interfaces that last. Try to make the interfaces as generic as possible and try to make them act as factories. Being able to put several plugins in one can greatly simplify deployment. If you plan to use plugins in your application, you can use the same interface for the plugins as for your internal functionalities. Simply turn the base functionality that you want to be a part of the application into a statically linked plugin. In this way you have only one interface to worry about from your application s viewpoint and you can still put functionality in your executable file.

10.5.4. URL Attributes (href and src)

# Populate the ``id`` with the value of the ``id`` routing variable def id_present(self, id): return 'The id is %s' % id

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hen writing software, you often get to a point where a large chunk of work has to be performed. If the writing is in a graphical application, the graphical user interface can sometimes freeze. Fortunately, it can be avoided when you use threading. Each application usually runs as a process. In most modern operating systems, several applications can run at once, meaning that several tasks are being performed in parallel. The processes are separated and are not concerned with each other. Inside each process there can be one or more threads running. These threads share resources and memory and need to be aware of each other. They can also collaborate on tasks, splitting heavy works among them. This also helps multiprocessor systems work efficiently because a single application can be split over several processors. Going back to the original problem the user interface freezing threads can help. By performing the large chunk of work that previously froze the application in a separate thread, the main thread can focus on updating and responding to events emanating from the user interface. The distribution of threads and processes between processors, and the switching between processes and threads, are handled by the underlying operating system, so threading is a very platform-dependent topic. Qt provides common classes for threads and processes as well as tools for making them cooperate and share data. However, the order of execution, as well as pace and prioritization, differ between platforms, so you must take extra care when implementing threading in your application.

You ve already seen routing variables being used in this way in the page controller from the SimpleSite Tip tutorial in 8, and you ll recall from 3 that you can also retrieve the controller name and action in the same way. All the routing variables that are passed to the action are also automatically added as attributes to the template context global c.

Attributes such as href and src take URLs as arguments. Depending on the tag they are associated with, the URL may be interpreted, de-referenced, or loaded at the time the browser interprets the tag (e.g., <img src=...> tags), or loaded only when the user performs an action (e.g., <a href=...> tags). If the value of the URL attribute is computed dynamically and may be influenced by a attacker, the attacker can make the URL refer to a resource that we did not intend. This could result in all kinds of problems (e.g., page spoofing), but may in particular result in injection of malicious script.

Let s first have a look at Qt s classes for threading and see how to get started with threads using Qt. It is important to understand that as soon as an application starts, it actually runs as a thread, called the main thread. This means that the call to the QApplication::exec method is made from the main thread, and the QApplication object lives in that thread. The main thread is sometimes referred to as the graphical user interface (GUI) thread because all widgets and other user interface objects must be handled by this thread. The main thread typically consists of an event loop and a set of objects created in that thread. By subclassing the Qt QThread class, you can create new threads with their own event loops and objects. The QThread class represents a thread that performs the work implemented in the run method. By implementing a custom run method for your thread, you have created a thread separate from the main thread that can perform its task.

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