pub unsafe extern "C" fn gdk_property_get( window: *mut GdkWindow, property: GdkAtom, type_: GdkAtom, offset: c_ulong, length: c_ulong, pdelete: c_int, actual_property_type: *mut GdkAtom, actual_format: *mut c_int, actual_length: *mut c_int, data: *mut *mut u8) -> gboolean