Appendix A explains how to install the software.The book focuses on explaining good idiomatic Qt 3 programming techniques rather than simply rehashing or summarizing Qt's extensive online documentation. And because we are involved in the development of Qt 4, we have tried to ensure that most of what we teach here will still be valid and sensible for Qt 4.It is assumed that you have a basic knowledge of C++. The code examples use a subset of C++, avoiding many C++ features that are rarely needed when programming Qt. In the few places where a more advanced C++ construct is unavoidable, it is explained as it is used.Qt made its reputation as a multiplatform toolkit, but because of its intuitive and powerful API, many organizations use Qt for single-platform development. Adobe Photoshop Album is just one example of a mass-market Windows application written in Qt. Many sophisticated software systems in vertical markets, such as 3D animation tools, digital film processing, electronic design automation (for chip design), oil and gas exploration, financial services, and medical imaging, are built with Qt. If you are making a living with a successful Windows product written in Qt, you can easily create new markets in the Mac OS X and Linux worlds simply by recompiling.Qt is available under various licenses. If you want to build commercial applications, you must buy a commercial license; if you want to build open source programs, you can use a non-commercial Qt edition. (The editions of Qt on the CD are non-commercial.) Qt is the foundation on which the K Desktop Environment (KDE) and the many open source applications that go with it are built.In addition to Qt's hundreds of classes, there are add-ons that extend Qt's scope and power. Some of these products, like the Qt/Motif integration module and Qt Script for Applications (QSA), are supplied by Trolltech, while others are provided by companies and by the open source community. See http://vig.prenhall.com/catalog/academic/product/0,4096,0131240722,00l.
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