Download e-book for kindle: Application Development with Qt Creator by Ray Rischpater

By Ray Rischpater

ISBN-10: 1783282312

ISBN-13: 9781783282319

Qt author is the best open-source, cross-platform built-in improvement setting (IDE) for development GUI purposes that run on home windows, Mac OS X, Linux, Android, and plenty of embedded structures. It tremendously simplifies cross-platform program improvement, concentrating on computer desktops, embedded structures, and cellular platforms. in order to construct and debug functions with Qt author very quickly, then this booklet is for you.

This e-book offers an intensive creation to utilizing Qt writer to make cross-platform purposes for you to learn in exactly a number of hours. It covers every little thing you must recognize to construct purposes with Qt writer. This publication additionally discusses the features of Qt author that make it a valued software program improvement atmosphere for college kids and execs alike.

The e-book begins by means of exhibiting you ways to get, set up, and use Qt author, starting with the fundamentals of ways to edit, collect, debug, and run purposes. alongside the way in which, you are going to learn how to use Qt to write down cross-platform GUI purposes for Mac OS X, home windows, Linux, and Android in C++ and Qt Quick.

This ebook covers the way to craft GUIs with Qt dressmaker, localize purposes utilizing Qt Linguist, and profile program functionality with Qt Creator's instruments and valgrind. you are going to achieve worthwhile perception in developing functions utilizing Qt in C++ and Qt quickly, Qt's declarative GUI authoring platform and research every little thing you want to understand to take advantage of Qt writer successfully as a software program developer.

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Additional info for Application Development with Qt Creator

Example text

23 ] Building Applications with Qt Creator If (in the previous screenshot) from line 7 we step over line 8 (pressing F10) and then press F11, we'll end up inside our factorial function, as you see in the next screenshot. I've clipped the screenshot so you only see the relevant panes of the debugger that have changed, and resized the window a bit, so you can see the whole call stack. The debugger about to enter a function [ 34 ] Chapter 2 At this point, if we step one more line (F10) again, we'll see the value for n change in the right-hand column, and the arrow advance to point at line 9 (again, as numbered in the screenshot).

Under the hood, Qt provides extensions to C++ syntax for declaring signals and slots. A simple example will help make this clear. The classic example you find in the Qt documentation is an excellent one, and we'll use it again it here, with some extension's. Imagine you have the need for a counter, that is, a container that holds an integer. In C++, you might write: class Counter { public: Counter() { m_value = 0; } int value() const { return m_value; } void setValue(int value); private: int m_value; }; The Counter class has a single private member, m_value, bearing its value.

For example, if I'm stopped at the beginning of the factorial function, as you see in the The debugger about to enter a function screenshot, with n set to 6, I can right-click on the variables pane, choose Insert New Expression Evaluator, and type in a formula n*(n-1) in the dialog that appears, and a new line appears in the pane showing the expression and the value 30. While this is a pretty contrived example, I can view pointer values and pointer dereferences as well. I can also conditionally break execution when a variable changes; this is called a conditional breakpoint or a data breakpoint.

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Application Development with Qt Creator by Ray Rischpater

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