icon-theme:get-default how to use? <Help>

[zedth2]

When I try to run icon-theme:get-default I get an error message.

scheme@(guile-user)> (icon-theme:get-default)

(process:9201): Gtk-CRITICAL **: 08:00:44.346: gtk_icon_theme_get_for_screen: assertion 'GDK_IS_SCREEN (screen)' failed
ice-9/boot-9.scm:1685:16: In procedure raise-exception:
In procedure %object-arg->scm: cannot convert a NULL pointer to an object of type "GtkIconTheme"

Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.

I'm not really sure the what GDK_IS_SCREEN is. I'm also not really sure how to pass a pointer in Guile. I tried using the (use-modules (system foreign)) to pass a pointer that didn't really work either. Pass an already built GtkIconTheme resulted in the following.

scheme@(guile-user)> (define m (gi:make <GtkIconTheme>))
scheme@(guile-user)> (icon-theme:get-default m)
ice-9/boot-9.scm:1685:16: In procedure raise-exception:
No applicable method for #<<generic> icon-theme:get-default (1)> in call (icon-theme:get-default #<<GtkIconTheme> 7f7e6fdb5030>)

Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
scheme@(guile-user) [1]> 

Which just makes me think I'm just not doing it right.

Someone please let me know the right way to use that function. I haven't dug into the C code which I might do now to see if I can't figure it out. Unfortunately I greping hasn't shown me where the function is defined so I'm assuming there's a lot of abstraction going on so I'm guessing this is gonna take me a while.

[LordYuuma]

I'm pretty sure you need to call Gtk's init function before you can access the screen (since Gio and Gtk both provide init, make sure to prefix it with e.g gtk: so that it is bound to gtk:init!). You might even need to run icon-theme:get-default in an application's activation hook after having created a window, though I'm not too sure about that one.

[zedth2]

Yeah I think I missed that.