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Download PDF by Ray Rischpater: Application Development with Qt Creator

By Ray Rischpater

ISBN-10: 1783282312

ISBN-13: 9781783282319

Qt writer is the major open-source, cross-platform built-in improvement atmosphere (IDE) for development GUI purposes that run on home windows, Mac OS X, Linux, Android, and plenty of embedded structures. It significantly simplifies cross-platform software improvement, focusing on machine pcs, embedded systems, and cellular structures. that will construct and debug purposes with Qt author very quickly, then this e-book is for you.

This publication presents an intensive advent to utilizing Qt writer to make cross-platform functions that you should learn in precisely a number of hours. It covers every little thing you must comprehend to construct functions with Qt author. This e-book additionally discusses the features of Qt writer that make it a valued software program improvement atmosphere for college kids and pros alike.

The e-book starts off via displaying you ways to get, set up, and use Qt author, starting with the fundamentals of the way to edit, bring together, debug, and run functions. alongside the way in which, you are going to discover ways to use Qt to put in writing cross-platform GUI purposes for Mac OS X, home windows, Linux, and Android in C++ and Qt Quick.

This publication covers the way to craft GUIs with Qt fashion designer, localize functions utilizing Qt Linguist, and profile software functionality with Qt Creator's instruments and valgrind. you'll achieve worthy perception in developing functions utilizing Qt in C++ and Qt quickly, Qt's declarative GUI authoring platform and study every little thing you must be aware of to exploit Qt writer successfully as a software program developer.

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Additional info for Application Development with Qt Creator

Example text

This code uses qDebug instead of the C standard library to perform its console output. The qDebug() function actually has a stream-savvy implementation too. I could have written the qDebug line as qDebug() << "6! is" << MathFunctions::factorial(6); and the code would have generated the same output. Now, build and run the application in debug mode; you should see a console window with the text 6! is 720. Try building and running the library in release mode; wait, why is the debugging output from qDebug still there?

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. Clients can invoke the value to obtain the counter's value, or set its value by invoking setValue with a new value. [ 46 ] Chapter 3 In Qt, using signals and slots, we write the class this way: #include class Counter : public QObject { Q_OBJECT public: Counter() { m_value = 0; } int value() const { return m_value; } public slots: void setValue(int value); void increment(); void decrement(); signals: void valueChanged(int newValue); private: int m_value; }; This Counter class inherits from QObject, the base class for all Qt objects.

The INSTALLS variable indicates where the resulting build product should be installed. Here, it's set in a scope. Scopes let you specify conditional options in qmake; the condition for the scope is a variable or expression, which may be true or false, and the code that follows is executed if the variable is true. path variable to /opt/ usr/lib if the unix variant is maemo, otherwise set it to /usr/lib for other unix variants, and in either case, set the INSTALLS variable to target". pro file; for a good discussion of qmake scopes you can use to control conditional compilation, see http://bit.

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Application Development with Qt Creator by Ray Rischpater

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