glib/glib.go
func (v *Object) GetProperty(name string) (interface{}, error) {
	cstr := C.CString(name)
	defer C.free(unsafe.Pointer(cstr))

	t, err := v.GetPropertyType(name)
	if err != nil {
		return nil, err
	}

	p, err := ValueInit(t)
	if err != nil {
		return nil, errors.New("unable to allocate value")
	}
	C.g_object_get_property(v.GObject, (*C.gchar)(cstr), p.native())
	return p.GoValue()
}
func (v *Object) GetProperty(name string) (interface{}, error) {
	cstr := C.CString(name)
	defer C.free(unsafe.Pointer(cstr))

	t, err := v.GetPropertyType(name)
	if err != nil {
		return nil, err
	}

	p, err := ValueInit(t)
	if err != nil {
		return nil, errors.New("unable to allocate value")
	}
	C.g_object_get_property(v.GObject, (*C.gchar)(cstr), p.native())
	return p.GoValue()
}
// GetProperty is a wrapper around g_object_get_property().