[gtkmm] saving images in Drawing Area

["Vishal Modak" <whizvish80 rediffmail com>]

hi

i am trying to save an image which i loaded using Gdk::PixBuf in 
gtkmm-2.0..i dont really know how to save it..The 
Gdk::Pixbuf..does provide a save function...but i dont really have 
idea as to how to use it..

I loaded the image using create_from_file function
Glib::RefPtr<gdk::Pixbuf> 
pbuf=Gdk::Pixbuf::create_from_file("logo.gif");
pixbuf->render_to_drawable(...............)

Another question is...when i make changes to the drawing 
area..where are the changes stored..in the memory or to the 
pixbuf..?

If they are saved in memory how do i saved updated image...?

If they are being saved in the pixbuf..then what is the way to 
save this pixbuf..?

Is any function which can allow me to save existing image data in 
drawing area widget ..to a file..?

please write to me any information u know

regards
vishal