socket.c

#include <gtk/gtk.h>
#include <gtk/gtkx.h>

static void destroy_cb(GtkWidget *widget, gpointer data)
{
    gtk_main_quit();
}

static void plug_added_cb(GtkWidget *widget, gpointer data)
{
    g_print("A plug has been added\n");
}

void load_css()
{
    GtkCssProvider *provider;
    GdkDisplay *display;
    GdkScreen *screen;
    provider = gtk_css_provider_new ();
    display = gdk_display_get_default ();
    screen = gdk_display_get_default_screen (display);
    gtk_style_context_add_provider_for_screen (screen, GTK_STYLE_PROVIDER (provider), GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
    const gchar* filename = "socket.css";
    GError *error = 0;
    gtk_css_provider_load_from_file(provider, g_file_new_for_path(filename), &error);
    g_object_unref (provider);
}

int main(int argc, char *argv[])
{
    gtk_init(&argc, &argv);

    GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_default_size(GTK_WINDOW(window), 200, 200);
    g_signal_connect(window, "destroy", G_CALLBACK(destroy_cb), NULL);

    GtkWidget *socket = gtk_socket_new();
    g_signal_connect(socket, "plug-added", G_CALLBACK(plug_added_cb), NULL);
    gtk_container_add(GTK_CONTAINER(window), socket);

    gtk_widget_show_all(window);
    unsigned int socket_id = gtk_socket_get_id (GTK_SOCKET(socket));
    g_print("%u\n",socket_id);

    load_css();
    gtk_main();

    return 0;
}