精通跨平台应用开发：Qt 4.2基础教程

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"《基础Qt开发》是一本由Johan Thelin编著的权威指南，针对C++程序员，特别是那些希望利用Trolltech的Qt开发跨平台应用的专业人士。作为KDE桌面环境的标准工具包，Qt在Windows、Mac OS、Linux和FreeBSD等操作系统上都有着广泛的应用，包括Adobe Photoshop Elements、Google Earth、Perforce Visual Client和Skype等知名软件。本书基于Qt 4.2版本，旨在深入讲解如何利用这个优秀的工具集来构建图形应用程序，这些应用能够无缝地移植到各种主流平台上。作者不仅指导读者编写代码，还会帮助解决在使用过程中可能遇到的常见问题，确保学习者能够理解和掌握Qt的核心概念和技术。书中涵盖了丰富的内容，包括但不限于Qt的基础架构、GUI编程、事件处理、信号与槽机制、MVC模式的应用、以及网络编程和数据库集成等。通过一系列实例和练习，读者将学会如何创建模块化的应用程序，理解如何利用Qt的模块化设计和C++语言特性实现高效开发。版权信息方面，《基础Qt开发》享有Johan Thelin的著作权，所有复制或传播行为需得到版权所有者及出版商的书面许可。此外，书中提及的Qt、Qt Logo、Qtopia、Qtopia Logo、Trolltech以及Trolltech Logo都是Trolltech及其子公司在美国和其他国家注册的商标。本书由Jason Gilmore担任主编辑，Witold Wysota提供技术审阅，还集结了一支由Steve Anglin、Ewan Buckingham、Gary Cornell、Jonathan Gennick、Jason Gilmore和Jonathan Hassell等组成的编辑团队，共同确保内容的质量和深度。《基础Qt开发》是一本实用的教程，适合想要步入Qt开发领域的初学者和有一定经验的开发者，它提供了一个系统的学习路径，使读者能够熟练掌握Qt开发并打造多平台的高质量应用程序。"

Acknowledgments

There are so many people I want to thank—everybody involved in the project has been help-

ful, positive, and supportive. It has been a great time working with all of you.

First, many thanks go to Witold Wysota, who has provided me with feedback, technical

input, and kind words. Without his support I could not have completed this project. I would

also like to thank Jason Gilmore from Apress for his excellent feedback and writing tips.

Thanks to him, the text is far more enjoyable to read.

Jasmin Blanchette of Trolltech helped me by producing screenshots from the Mac. The

excellent support team at Trolltech also clarified unclear issues and fixed bugs. Everyone at

Trolltech has been very positive and supportive.

I want to thank all the people at Apress: Matt Wade, who gave me the chance to do this;

Elizabeth Seymour, Grace Wong, and Tracy Brown Collins for managing the project. An extra

thanks to Tracy who pushed me the last mile to get the project done on time.

Without the help of Nancy Sixsmith’s language skills, the text would not have been as easy

to read. Thanks to her attention to detail and excellent writing abilities, the text reads as well

as it does today.

There are so many people involved in this project that I have not worked with so closely.

I’m still very grateful to their efforts and appreciate their skills. Many thanks go to Kelly

Winquist, Dina Quan, Brenda Miller, April Milne, and Paulette McGee.

xxi

The Qt Way of C++

Qtis a cross-platform, graphical, application development toolkit that enables you to com-

pile and run your applications on Windows, Mac OS X, Linux, and different brands of Unix.

A large part of Qt is devoted to providing a platform-neutral interface to everything, ranging

from representing characters in memory to creating a multithreaded graphical application.

■Note Even though Qt was originally developed to help C++ programmers, bindings are available for a

number of languages. Trolltech provides official bindings for C++, Java, and JavaScript. Third parties provide

bindings for many languages, including Python, Ruby, PHP, and the .NET platform.

This chapter starts by taking an ordinary C++ class and integrating it with Qt to make it

more reusable and easier to use. In the process, you have a look at the build system used to

compile and link Qt applications as well as installing and setting up Qt on your platform.

The chapter then discusses how Qt can enable you to build components that can be inter-

connected in very flexible ways. This is what makes Qt such a powerful tool—it makes it easy

to build components that can be reused, exchanged, and interconnected. Finally, you learn

about the collection and helper classes offered by Qt.

Installing a Qt Development Environment

Before you can start developing Qt applications, you need to download and set up Qt. You will

use the open source edition of Qt because it is freely available for all. If you have a commercial

license for Qt, you have received installations instructions with it.

The installation procedure differs slightly depending on the platform that you are plan-

ning to use for development. Because Mac OS X and Linux are both based on Unix, the

installation process is identical for the two (and all Unix platforms). Windows, on the other

hand, is different and is covered separately. You can start all three platforms by downloading

the edition suitable for your platform from www.trolltech.com/products/qt/downloads.

Installing on Unix Platforms

All platforms except Windows can be said to be Unix platforms. However, Mac OS X differs

from the rest because it does not use the X Window System, more commonly known as X11,

CHAPTER 1

for handling graphics. So Mac OS X needs a different Qt edition; the necessary file (qt-mac-

opensource-src-version.tar.gz) can be downloaded from Trolltech. The X11-based Unix

platforms use the qt-x11-opensource-src-version.tar.gz file from Trolltech.

■Note Qt depends on other components such as compilers, linkers, and development libraries. The

requirements differ depending on how Qt is configured, so you should study the reference documentation

if you run into problems.

When the file has been downloaded, the procedure goes like this: unpack, configure, and

compile. Let’s go through these steps one by one. The easiest way is to work from the com-

mand prompt.

To unpack the file, download it, place it in a directory, and go there in your command

shell. Then type something like this (put x11 or mac in place of edition and use the version

that you have downloaded):

tar xvfz qt-edition-opensource-src-version.tar.gz

This code extracts the file archive to a folder named qt-edition-opensource-src-version.

Use the cd command to enter that directory:

cd qt-edition-opensource-src-version

Before building Qt, you need to configure it using the configure script and its options.

Run the script like this:

./configure options

There are lots of options to choose from. The best place to start is to use -help, which

shows you a list of the available options. Most options can usually be left as the default, but

the -prefix option is good to use. You can direct the installation to go to a specific location by

specifying a path just after the option. For instance, to install Qt in a directory called inst/qt4

in your home directory, use the following configure command:

./configure –prefix ~/inst/qt4

The Mac OS X platform has two other options that are important to note. First, adding the

-universal option creates universal binaries using Qt. If you plan to use a PowerPC-based

computer for your development, you have to add the -sdk option.

The configure script also makes you accept the open source license (unless you have a

commercial license) before checking that all the dependencies are in place and starting to cre-

ate configuration files in the source tree. When the script is done, you can build Qt using the

following command:

make

This process will take a relatively long time to complete, but after it finishes you can

install Qt by using the next line:

make install

CHAPTER 1 ■ THE QT WAY OF C++4

■Note The installation command might need root access if you try to install Qt outside your home

directory.

When Qt has been installed, you need to add Qt to your PATH environment variable. If you

are using a compiler that does not support rpath, you have to update the LD_LIBRARY_PATH

environment variable as well.

If you used the $HOME/inst/qt4 prefix when running configure, you need to add the

path $HOME/inst/qt4/bin to PATH. If you are using a bash shell, change the variable using an

assignment:

export PATH=$HOME/inst/qt4/bin:$PATH

If you want this command to run every time you start a command shell, you can add it to

your .profile file just before a line that reads export PATH. This exports the new PATH environ-

ment variable to the command-line session.

■Note The methods for setting up environment variables differ from shell to shell. If you are not using

bash, please refer to the reference documentation on how to set the PATH variable for your system.

If you have several Qt versions installed at once, make sure that the version that you

intend to use appears first in the PATH environment variable because the qmake binary used

knows where Qt has been installed.

If you have to change the LD_LIBRARY_PATH environment variable, add the

$HOME/inst/qt4/lib directory to the variable. On Mac OS X and Linux (which use the Gnu

Compiler Collection [GCC]), this step is not needed.

Installing on Windows

If you plan to use the Windows platform for your Qt development, download a file called qt-

win-opensource-version-mingw.exe from Trolltech. This file is an installer that will set up Qt

and a mingw environment.

■Note mingw, which is short for Minimalist GNU for Windows, is a distribution of common GNU tools for

Windows. These tools, including GCC and make, are used by the open source edition of Qt for compiling and

linking.

The installer works as a guide, asking you where to install Qt. Make sure to pick a direc-

tory path free from spaces because that can cause you problems later. After you install Qt, you

see a Start menu folder called Qt by Trolltech (OpenSource). This folder contains entries for

the Qt tools and documentation as well as a Qt command prompt. It is important that you

CHAPTER 1 ■ THE QT WAY OF C++ 5

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精通跨平台应用开发：Qt 4.2基础教程

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