create a xpm file

[yoann toussaint <yoann toussaint free fr>]

hello,
I use function gdk_create_from_xpm to load a xpm to a pixmap, but I 
would like to save a pixmap to a xpm file.
how to do this ?
should I use a pixmap (server side) or a image (client side) ?

thanks for help,
yoann