code: func PageSetupNewFromFile(fileName string) (*PageSetup, error) {
  	cstr := C.CString(fileName)
  	defer C.free(unsafe.Pointer(cstr))
  	var err *C.GError = nil
  	c := C.gtk_page_setup_new_from_file((*C.gchar)(cstr), &err)
  	if c == nil {
  		defer C.g_error_free(err)
  		return nil, errors.New(C.GoString((*C.char)(err.message)))
  	}
  	obj := glib.Take(unsafe.Pointer(c))
  	return &PageSetup{obj}, nil
  
  }
docs: // PageSetupNewFromFile() is a wrapper around gtk_page_setup_new_from_file().