how to use get_geometry correctlly

Hi, all,

I inherit Gtk::Button, and wonna change the position of my widget internally.
And I use following steps to achieve this, but segmentation fault.
Please correct me, thanks!

/* in my widget */
int x, y, tmp=0;
get_window()->get_geometry( x, y, tmp, tmp, tmp );// get current position, but segmentation fault

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