Qt is truly one of the best cross-platform frameworks for building applications. As such, it has a large number of core classes to manage data, as well as wrappers around platform services such as threading, the filesystem, network I/O, and of course, graphics.
In this chapter, we discuss some of Qt's core classes that you will find especially handy while writing your applications. In this discussion, we will focus on the bits of Qt that are especially helpful when constructing the business logic for your application. We will begin with a discussion on a handful of useful data classes. After that, we will look at Qt's support for multithreading, a key tool in keeping applications feeling responsive. Next, we will look at accessing files as well as HTTP I/O, an important component in many applications. We will close with a look at Qt's XML parser...