Problem with Pango displaying Greek letters under Linux

On Wed, 1 Mar 2006, Nick Chorley wrote:

> I have a program with a GUI written in GTK+ (by me!)
and I'd really like to
> be able to display Greek letters, rather than write
things like "alpha".
> Note that this is *not* a programming question, because
the problem is not
> how to put Greek letters in labels (as I found out how
to do that). The
> program compiles fine, but when I run it, I get the
following error message:
>
> Pango-WARNING **: Invalid UTF-8 string passed to
pango_layout_set_text()
>
> and the Greek letters aren't displayed. I'm using
version 1.8.2 of Pango and
> what's puzzling me is that *the same code works fine
under FreeBSD 6.0, with
> the same version of Pango*. For information, I'm using
things like "\u03B1"
> as the strings for the labels in GTK+, e.g.
>
> GtkWidget *label =
gtk_label_new("\u03B2");

The interpretation of such a thing pretty much depends on
your
compiler, but most probably this doesn't generate what you
have
in mind, or at list not on your Linux.  Try using
g_unichar_to_utf8 instead.

behdad


> Any ideas as to why this doesn't work right under
Linux?
>
> Thanks!

--behdad
http://behdad.org/

"Commandment Three says Do Not Kill, Amendment Two
says Blood Will Spill"
	-- Dan Bern, "New American Language"
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On Wed, 1 Mar 2006, Nick Chorley wrote:

> Thanks for the reply, Behdad. What is the correct way
to do this? I can't
> work out what I need to pass for the first argument of
g_unichar_to_utf8().
> The GLib reference isn't very clear, it just tells me
that a gunichar is "a
> type which can hold any UCS-4 character code".
I've tried something like the
> following:
>
> gchar *greekString;
> g_unichar_to_utf8(03B1, greekString);,
>
> which won't compile. I found an example on the web
that has
>
> g_unichar_to_utf8(0x399, buffer);
>
> and while this compiles, the program seg faults when I
try to run it.

Something like:

char buf[7];
int len;

len = g_unichar_to_utf8 (0x03B1, buf);
buf[len] = '\0';

Or simply look up the UTF-8 representation of U+03B1 in
gucharmap
and use "\316\261".

behdad


> Thanks again for the reply!
>
> Nick
>
> On 3/1/06, Behdad Esfahbod <behdadcs.toronto.edu> wrote:
>
> > The interpretation of such a thing pretty much
depends on your
> > compiler, but most probably this doesn't generate
what you have
> > in mind, or at list not on your Linux.  Try using
> > g_unichar_to_utf8 instead.
> >
> > behdad
> >
> >
>

--behdad
http://behdad.org/

"Commandment Three says Do Not Kill, Amendment Two
says Blood Will Spill"
	-- Dan Bern, "New American Language"
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