Re: GdkEventKey --> utf-8 ?

[Joerg Anders <jan informatik tu-chemnitz de>]

On Thu, 10 Sep 2009, Tor Lillqvist wrote:

> Please post a minimal but complete sample program that
> exhibits the in your opinion buggy behaviour.

--------------------------------------------

gboolean key_press_handler(GtkWidget *widget,  GdkEventKey *event, gpointer  data)  {
	char utf8string[10];
	int ll;
	guint32 unichar;

	printf("keyval = %d (0x%x)\n", event->keyval, event->keyval);
	unichar = gdk_keyval_to_unicode(event->keyval);
	printf("unichar = %d (0x%x)\n", unichar, unichar);
	ll = g_unichar_to_utf8(unichar, utf8string);
	utf8string[ll] = '\0';
	printf("utf8 = %s\n", utf8string); fflush(stdout);
	return FALSE;
}

int main(int argc, char *argv[]) {
	GtkWidget *the_window;
	gtk_init (&argc, &argv);
	the_window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
	g_signal_connect (the_window, "key-press-event", G_CALLBACK (key_press_handler), NULL);
	gtk_widget_show_all(the_window);
	gtk_main();
	return 0;
}

-------------------------------------------

The result is:

keyval = 111 (0x6f)
unichar = 111 (0x6f)
utf8 = o


But note: If he uses a GtkEntry widget:

------------------------------------------------------------

static void OnEnter(GtkEntry *entry, gpointer user_data)  {
	const char *the_text, *cptr;
	the_text = gtk_entry_get_text(GTK_ENTRY(entry));
	printf("TEXT = %s\n", the_text);
	for (cptr = the_text; *cptr; cptr++) {
		printf("\t%d(0x%x)\n", *cptr, *cptr);
	}
	fflush(stdout);
}

int main(int argc, char *argv[]) {
	GtkWidget *the_window;
	GtkWidget *the_entry;
	gtk_init (&argc, &argv);
	the_window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
	the_entry = gtk_entry_new();
	g_signal_connect (the_entry, "activate", G_CALLBACK (OnEnter), NULL);
	gtk_container_add (GTK_CONTAINER (the_window), the_entry);
	gtk_widget_show_all(the_window);
	gtk_main();
	return 0;
}

------------------------------------------------------------

The result is correct:

TEXT = ö
     -61(0xffffffc3)
     -74(0xffffffb6)

This shows: The X11 configuration isn't totally wrong.
the question is: What does the GtkEntry widget, what the
gdk_keyval_to_unicode() function is unable to do?


I should mention he uses an

  Option          "XkbLayout"     "es"

in /etc/X11/xorg.conf

I asked him how he inserts the German Umlauts because they are not
present on a Spanish keyboard:

http://en.wikipedia.org/wiki/Keyboard_layout#Spanish_.28Spain.29.2C_aka_Spanish_.28International_sort.29

His answer:

 + The key on the left of ç. (in red - has a blu { ) So:
 + I press and hold Shift, then press that key, unpress and type o.
 + Note: if you want an Ö you must hold shift key pressed until you
 + press o.
 + Look this is the way to do this, and works in all applications. The
 + same for ê, for example.
 +
 + For an á I have to press that key (without shift) and then a.
 +

Perhaps this includes the solution. Any Spanish users/developers on
this list ?

--
J.Anders, GERMANY, TU Chemnitz, Fakultaet fuer Informatik