code: func DisplayOpen(displayName string) (*Display, error) {
  	cstr := C.CString(displayName)
  	defer C.free(unsafe.Pointer(cstr))
  	c := C.gdk_display_open((*C.gchar)(cstr))
  	if c == nil {
  		return nil, nilPtrErr
  	}
  
  	return &Display{glib.Take(unsafe.Pointer(c))}, nil
  }
docs: // DisplayOpen() is a wrapper around gdk_display_open().