By Ray Rischpater

ISBN-10: 1783282312

ISBN-13: 9781783282319

Qt author is the top open-source, cross-platform built-in improvement surroundings (IDE) for development GUI purposes that run on home windows, Mac OS X, Linux, Android, and plenty of embedded platforms. It enormously simplifies cross-platform software improvement, focusing on machine pcs, embedded systems, and cellular platforms. with the intention to construct and debug functions with Qt author very quickly, then this booklet is for you.

This publication presents an intensive creation to utilizing Qt writer to make cross-platform functions so you might learn in exactly a number of hours. It covers every little thing you must comprehend to construct functions with Qt writer. This publication additionally discusses the points of Qt writer that make it a valued software program improvement atmosphere for college kids and execs alike.

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

This booklet covers the best way to craft GUIs with Qt fashion designer, localize purposes utilizing Qt Linguist, and profile software functionality with Qt Creator's instruments and valgrind. you'll achieve beneficial perception in developing purposes utilizing Qt in C++ and Qt fast, Qt's declarative GUI authoring platform and study every thing you must recognize to exploit Qt author successfully as a software program developer.

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Example text

Slots may take arguments, but do not return them; the communication between a signal and its slots is one way, initiating with the signal and terminating with the slot(s) connected to the signal. The counter offers a single signal. Like slots, signals are also declared using a Qt extension to C++, signals. In the example above, a Counter object emits the signal valueChanged with a single argument, which is the new value of the counter. A signal is a function signature, not a method; Qt's extensions to C++ use the type signature of signals and slots to ensure type safety between signal-slot connections, a key advantage signals and slots have over other decoupled messaging schemes.

Hitting Add Breakpoint… or Edit Breakpoint… brings up the Breakpoint Editor, a daunting dialog given the humble breakpoint itself. The following screenshot shows the Breakpoint Editor: The Breakpoint Editor window From the editor, you can fine-tune a breakpoint, setting: • The kind of breakpoint. Most breakpoints are by filename and line number—a specific line of the code—but you have several other choices, including: °° The entry point of a function by name °° When a memory address is reached for execution [ 36 ] Chapter 2 °° When a C++ exception is thrown or caught °° When a JavaScript exception occurs °° When your main function starts °° When a new process is forked °° When a system call occurs °° When data is accessed at a fixed location, or an address indicated by an expression involving a pointer variable at runtime • The location of the breakpoint (such as the source line number and filename, or the function), depending on your choice from the previous list.

Qt Creator built the application in debug mode, started the application, and let it run to the breakpoint on line 7. Setting breakpoints and stepping through your program A breakpoint, if you haven't encountered the idea before, is just that—a point at which execution breaks and you can examine the program's state. Once stopped at a breakpoint, you can step into a function, or step over a line, executing your program one line at a time to see how it's behaving. In the Debug view, clicking on the left of the number line lets you set or clear breakpoints.

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