Combos & NULL values and/or 'no value selected'

Greetings. I'm trying to find a sensible approach to dealing with NULL values, combos, and database values. It's of course a valid situation where a database field has a NULL value. It's also valid that someone wants to SET a database field to NULL, by "somehow" de-selecting a currently selected i

text bold doesn't work with chinese and japanese in Pango

Hi All: I am using pangoft2(pango_ft2_render_layout) to render text. I want to get the bold effect by using pango_font_description_set_weight(desc, PANGO_WEIGHT_BOLD) It works well when the text are letters or numbers,but it doesn't work with Chinese or Japanese. Does anyone know the reason? Ple