Gtk::DrawingArea

[TheLonelyStar <nabble lonely-star org>]

Hello dear community,

I have trouble with Gtk::DrawingArea. Since the class seem to have no more
than the gobj() member function, I tried the following (copying from
examples I found in the net):

bool on_exposure(GdkEventExpose* event)
{
	Gtk::DrawingArea* tmp=(Gtk::DrawingArea*)refXml->get_widget("DrawingArea");
	GtkDrawingArea* da=tmp->gobj();
	gdk_draw_arc (da->window,
				  da->style->fg_gc[GTK_WIDGET_STATE (da)],
				  TRUE,
				  0, 0, da->allocation.width, da->allocation.height,
				  0, 64 * 360);
	return true;
}

Now, when I try to compile, I get:

g++ $(pkg-config --libs --cflags gtkmm-2.4) $(pkg-config --libs --cflags
libglademm-2.4) main.cc
main.cc: In function 'bool do_draw(GdkEventExpose*)':
main.cc:30: error: invalid use of undefined type 'struct _GtkDrawingArea'
/usr/include/gtkmm-2.4/gtkmm/drawingarea.h:34: error: forward declaration of
'struct _GtkDrawingArea'
main.cc:31: error: invalid use of undefined type 'struct _GtkDrawingArea'
/usr/include/gtkmm-2.4/gtkmm/drawingarea.h:34: error: forward declaration of
'struct _GtkDrawingArea'
main.cc:33: error: invalid use of undefined type 'struct _GtkDrawingArea'
/usr/include/gtkmm-2.4/gtkmm/drawingarea.h:34: error: forward declaration of
'struct _GtkDrawingArea'
main.cc:33: error: invalid use of undefined type 'struct _GtkDrawingArea'
/usr/include/gtkmm-2.4/gtkmm/drawingarea.h:34: error: forward declaration of
'struct _GtkDrawingArea'

What is wrong? Is this the correct way to use DrawingArea in gtkmm???

Thanks!
Nathan
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