Re: how can I show an image in the main window's drawing area?

[Michal Porzuczek <mporzuczek gmail com>]

> after clicked on the file_chooser_dialog's ok button, How can I manipulate the widget in the main window to 
> show the selected RGB file while in the callback function?

I'm not sure if this is what you need, but what you should do is
create an expose_event signal for the drawing area where you should
tell the program to draw the RGB image then in the callback after you
press ok in the file_chooser_dialog call gtk_widget_queue_draw_area
which will call the expose_event.

Try looking at the scribble example in the GTK Tutorial, it helped me out.

Michal