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Every programming book I have read in my lifetime has begun with a Hello World example application. I do not want to be the one to break with tradition. Before we get to the example, you should know that all of the source code for every example is downloadable from this book s web site, found at www.gtkbook.com. You can compile each example with the method presented in a later section of this chapter or follow the instructions found in the base folder of the package. Listing 2-1 is the first and most simple GTK+ application in this book. It initializes GTK+, creates a window, displays it to the user, and waits for the program to be terminated. It is very basic, but it shows the essential code that every GTK+ application you create must have!
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CHAPTER 2 YOUR FIRST GTK+ APPLICATIONS
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Note The application in Listing 2-1 does not provide a way for you to terminate it. If you click the X in the
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corner of the window, the window will close, but the application will remain running. Therefore, you will have to press Ctrl+C in your terminal window to force the application to exit!
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Listing 2-1. Greeting the World (helloworld.c) #include <gtk/gtk.h> int main (int argc, char *argv[]) { GtkWidget *window; /* Initialize GTK+ and all of its supporting libraries. */ gtk_init (&argc, &argv); /* Create a new window, give it a title and display it to the user. */ window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Hello World"); gtk_widget_show (window); /* Hand control over to the main loop. */ gtk_main (); return 0; } The <gtk/gtk.h> file includes all of the widgets, variables, functions, and structures available in GTK+ as well as header files from other libraries that GTK+ depends on, such as <glib/glib.h> and <gdk/gdk.h>. In most of your applications, <gtk/gtk.h> will be the only GTK+ header file you will need to include for GTK+ development, although some more advanced applications may require further inclusions. Listing 2-1 is one of the simplest applications that you can create with GTK+. It produces a top-level GtkWindow widget with a default width and height of 200 pixels. There is no way of exiting the application except to kill it in the terminal where it was launched. You will learn how to use signals to exit the application when necessary in the next example. This example is rather simple, but it shows the bare essentials you will need for every GTK+ application you create. The first step in understanding the Hello World application is to look at the content of the main() function.
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Initializing GTK+
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Initializing the GTK+ libraries is extremely simple for most applications. By calling gtk_init(), all initialization work is automatically performed for you. It begins by setting up the GTK+ environment, including obtaining the GDK display and preparing the GLib main event loop and basic signal handling. If gtk_init() does more than
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CHAPTER 2 YOUR FIRST GTK+ APPLICATIONS
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you need, you may create your own, small initialization function that calls fewer of the functions, such as gdk_init() and g_main_loop_new(), although this is not necessary for most applications. One of the great benefits of using open source libraries is the ability to read the code yourself to see how things are done. You can easily view the GTK+ source code to figure out everything that is called by gtk_init() and choose what needs to be performed by your application. However, you should use gtk_init() for now until you learn more about how each of the libraries are used and how they interrelate. You will also notice that we passed the standard main() argument parameters argc and argv to gtk_init(). The GTK+ initialization function parses through all of the arguments and strips out any it recognizes. Any parameters it uses will be removed from the list, so you should do any argument parsing of your own after calling gtk_init(). This means that a standard list of parameters can be passed and parsed by all GTK+ applications without any extra work performed by you, the developer. It is important to call gtk_init() before any other function calls to the GTK+ libraries. Otherwise, your application will not function properly and will likely crash. The gtk_init() function will terminate your application if it is unable to initialize the GUI or has any other significant problems that cannot be resolved. If you would like your application to fall back on a text interface when GUI initialization fails, you need to use gtk_init_check(). gboolean gtk_init_check (int *argc, char ***argv); If the initialization fails, FALSE is returned. Otherwise, gtk_init_check() will return TRUE. You should only use this function if you have a textual interface to fall back on!
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