On 01/31/11 16:39, James Morris wrote: > On 31 January 2011 13:32, Jannis Pohlmann <jan...@xfce.org> wrote: > >>> Can anyone point me in the direction of code examples where the >>> construction of the g object requires a parameter so I can see how to >>> do it please? - I can't make sense of the documentation. >> I usually do this by adding a construct or construct-only property to >> the object class and creating a my_object_new() function that takes a >> parameter for this property that I can then pass to g_object_new(). >> >> Here's a simple example from Xfce's XDG menu library garcon: GarconMenu >> is the object and it needs a menu file (a GFile object) to be >> constructed properly. So what we did is to to install a construct-only >> property like this: >> >> http://git.xfce.org/libs/garcon/tree/garcon/garcon-menu.c#n246 > It looks straight forward at first glance but soon becomes apparent > it's not at all :/ > > I want to pass a const char** null terminated list of C strings - > which is obviously not a G_TYPE_FILE! > I thought maybe I could use G_TYPE_ARRAY but that results in: > > GLib-GObject-CRITICAL **: g_param_spec_object: assertion `g_type_is_a > (object_type, G_TYPE_OBJECT)' failed > > So I've no idea what to do there. It's as clear as mud; I'm a GObject newb. > > >> and write a _new() function that takes a GFile for this property and >> passes it to g_object_new(): >> >> http://git.xfce.org/libs/garcon/tree/garcon/garcon-menu.c#n459 >> >> This property will not be available in the init function (e.g. >> garcon_menu_init) but if you want to do something with it before the >> object can be used by the outside world, you can do that by overriding >> the GObject constructed function like you do with finalize or >> get_property. In constructed, the construct and construct-only >> properties will be set and you can do something with them. >> > Anyway, thanks for making an effort to help. I think the only way > anyone could provide any further help here would be to show me an > example that works using a const char ** null terminated list of c > strings as a parameter to the constructor.
Use gpointer or a gboxed. Stefan > I will most likely avoid GObject all together and do it the old > fashioned C way as this only seems to be making it more complex than > necessary. > > Thanks, > James. > _______________________________________________ > gtk-app-devel-list mailing list > gtk-app-devel-list@gnome.org > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
