Gtk - GTK+ Hello World

GTK+ Hello World

The following code presents a graphical GTK+ hello-world program in the C programming language. This program has a window with the title "Hello, world!" and a label with similar text.

#include int main (int argc, char *argv) { GtkWidget *window; GtkWidget *label; gtk_init(&argc, &argv); /* Create the main, top level window */ window = gtk_window_new(GTK_WINDOW_TOPLEVEL); /* Give it the title */ gtk_window_set_title(GTK_WINDOW(window), "Hello, world!"); /* ** Map the destroy signal of the window to gtk_main_quit; ** When the window is about to be destroyed, we get a notification and ** stop the main GTK+ loop by returning 0 */ g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL); /* ** Assign the variable "label" to a new GTK label, ** with the text "Hello, world!" */ label = gtk_label_new("Hello, world!"); /* Plot the label onto the main window */ gtk_container_add(GTK_CONTAINER(window), label); /* Make sure that everything, window and label, are visible */ gtk_widget_show_all(window); /* ** Start the main loop, and do nothing (block) until ** the application is closed */ gtk_main; return 0; }

Using GCC and pkg-config in a Unix shell, this code can be compiled with the following command (assume above source has file name "helloworld.c"):

$ gcc -Wall helloworld.c -o helloworld $(pkg-config --cflags --libs gtk+-3.0)