<?xml version="1.0" encoding="utf-8"?>
<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" xmlns:xi="http://www.w3.org/2001/XInclude" type="guide" style="task" id="hello-world" xml:lang="pt-BR">
<info>
<!-- The text title is used on the help.gnome.org -->
<title type="link">Hello World (C)</title>
<link type="guide" xref="c#examples"/>
<revision version="0.1" date="2013-06-17" status="review"/>
<credit type="author copyright">
<name>Susanna Huhtanen</name>
<email its:translate="no">ihmis.suski@gmail.com</email>
<years>2012</years>
</credit>
<credit type="editor">
<name>Tiffany Antopolski</name>
<email its:translate="no">tiffany.antopolski@gmail.com</email>
</credit>
<credit type="editor">
<name>Bastian Ilsø</name>
<email its:translate="no">bastianilso@gnome.org</email>
</credit>
<desc>Creating a small "Hello, World" application using GTK+.</desc>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Rafael Ferreira</mal:name>
<mal:email>rafael.f.f1@gmail.com</mal:email>
<mal:years>2013</mal:years>
</mal:credit>
</info>
<title>Hello world</title>
<note>
<p>For a detailed walk-through of creating a GTK+ dialog in C, see
<link href="https://developer.gnome.org/gtk3/stable/gtk-getting-started.html">Getting Started with GTK+</link></p>
</note>
<p>Writing a hello world GTK+ dialog in C can be done as seen in the code sample below:</p>
<code mime="text/x-csrc" style="numbered">
#include <gtk/gtk.h>
static void
activate (GtkApplication* app,
gpointer user_data)
{
GtkWidget *window;
GtkWidget *label;
window = gtk_application_window_new (app);
label = gtk_label_new ("Hello GNOME!");
gtk_container_add (GTK_CONTAINER (window), label);
gtk_window_set_title (GTK_WINDOW (window), "Welcome to GNOME");
gtk_window_set_default_size (GTK_WINDOW (window), 200, 100);
gtk_widget_show_all (window);
}
int
main (int argc,
char **argv)
{
GtkApplication *app;
int status;
app = gtk_application_new (NULL, G_APPLICATION_FLAGS_NONE);
g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
status = g_application_run (G_APPLICATION (app), argc, argv);
g_object_unref (app);
return status;
}
</code>
<p>GtkApplication initializes GTK+. It also connects the <gui>x</gui> button
that's automatically generated along with the window to the "destroy" signal.
We can start building our first window.
We do this by creating a variable called <var>window</var> and assigning it
a gtk_application_window_new. The window title can be any string you want it
to be. To be on the safe side, it's best to stick to UTF-8 encoding.
The code above will create a dialog window similar to what can be seen below:</p>
<media type="image" mime="image/png" src="media/hello-world.png"/>
</page>