<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="de">

  <info>

    <title type="link">Hallo, Welt! (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>Mario Blättermann</mal:name>

      <mal:email>mario.blaettermann@gmail.com</mal:email>

      <mal:years>2011, 2013</mal:years>

    </mal:credit>

  </info>

  <title>Hello world</title>

  <note>

    
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>

  </note>

  
Writing a hello world GTK+ dialog in C can be done as seen in the code sample below:

    #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;

}

  
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 window 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:

  <media type="image" mime="image/png" src="media/hello-world.png"/>

</page>