RosettaCodeData/Task/Call-a-foreign-language-fun.../Ol/call-a-foreign-language-fun...

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; The sample usage of GTK3+ library
(import (otus ffi)
(lib glib-2)
(lib gtk-3))
(define print_hello (vm:pin (cons
(list GtkWidget* gpointer)
(lambda (widget userdata)
(print "hello")
TRUE
))))
(define activate (vm:pin (cons
(list GtkApplication* gpointer)
(lambda (app userdata)
(define window (gtk_application_window_new app))
(print "window: " window)
(gtk_window_set_title window "Window")
(gtk_window_set_default_size window 200 200)
(define button_box (gtk_button_box_new GTK_ORIENTATION_HORIZONTAL))
(gtk_container_add window button_box)
(define button (gtk_button_new_with_label "Hello World"))
(g_signal_connect button "clicked" (G_CALLBACK print_hello) NULL)
(gtk_container_add button_box button)
(gtk_widget_show_all window)
))))
(define app (gtk_application_new (c-string "org.gtk.example") G_APPLICATION_FLAGS_NONE))
(g_signal_connect app (c-string "activate") (G_CALLBACK activate) NULL)
(g_application_run app 0 #false)