Редактирование: GTK FAQ Introduction

<h1>Introduction to GTK+</h1>

== About this tutorial ==

This is an introductory GTK+ programming tutorial. The tutorial is targeted for the C programming language. 
It has been created and tested on Linux. The GTK+ programming tutorial is suited for novice and intermediate programmers. 

== GTK+ ==

<img src="../images/gtk.png" style="float: left; margin-right:10px"> 

The <b>GTK+</b> is a library for creating graphical user interfaces. The library is created in C programming language. The GTK+ library is also called the GIMP Toolkit. Originally, the library was created while developing the GIMP image manipulation program. Since then, the GTK+ became one of the most popular toolkits under Linux and BSD Unix. Today, most of the GUI software in the open source world is created in Qt or in GTK+.
The GTK+ is an object oriented application programming interface. The object oriented system is created with the Glib object system, which is a base for the GTK+ library. The <b>GObject</b> also enables to create language bindings for various other programming languages. Language bindings exist for C++, Python, Perl, Java, C# and other programming languages. 

The GTK+ itself depends on the following libraries. 

* Glib
* Pango
* ATK
* GDK
* GdkPixbuf
* Cairo

The <b>Glib</b> is a general purpose utility library. It provides various data types, string utilities, enables error reporting, message logging, working with threads and other useful programming features. 
The <b>Pango</b> is a library which enables internationalization. 
The <b>ATK</b> is the accessibility toolkit. This toolkit provides tools which help physically challenged people work with computers. The <b>Cairo</b> is a library for creating 2D vector graphics.
It has been included in GTK+ since version 2.8.

Gnome and XFce desktop environments have been created using the GTK+ library. SWT and wxWidgets are well known  programming frameworks, that use GTK+. Prominent software applications that use GTK+ include Firefox or Inkscape.

== Compiling GTK+ applications ==

To compile GTK+ applications, we have a handy tool called <b>pkg-config</b>.
The pgk-config returns metadata about installed libraries. Simply put, if we want to use a specific library, it will provide us necessary dependent libraries and include files, that we need. The pkg-config program retrieves information about packages from special metadata files. 

<source lang="cpp">
 gcc -o simple simple.c `pkg-config --libs --cflags gtk+-2.0`

</source>

Here we show, how we can compile a simple program. The source code consists of one file, simple.c. 

<source lang="cpp">
$ pkg-config --cflags gtk+-2.0
-I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 
-I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 
-I/usr/lib/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/libpng12  
</source>

This list shows all necessary include files for GTK+ programming. 

<source lang="cpp">
$ pkg-config --libs gtk+-2.0
-lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgdk_pixbuf-2.0 -lm -lpangocairo-1.0 
-lfontconfig -lXext -lXrender -lXinerama -lXi -lXrandr 
-lXcursor -lXfixes -lpango-1.0 -lcairo -lX11 -lgobject-2.0 
-lgmodule-2.0 -ldl -lglib-2.0 
</source>

And this list shows the necessary libraries. 

== Sources ==

* [http://www.gtk.org gtk.org]
* [http://www.gtkforums.com gtkforums.com]
* GTK+ / Gnome application development

[[Категория:GTK+]]