dialogs/__init__.py
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 24 Aug 2018 13:41:43 +0300
changeset 2297 96ca6b056c55
parent 1853 47a3f39bead0
child 2330 8c18b1a3e2bf
child 2347 6dca42cd2b2b
permissions -rw-r--r--
Proper fix for error 'object has no attribute 'getSlave' in EtherCAT extension

traceback:
File "/home/developer/WorkData/PLC/beremiz/beremiz/IDEFrame.py", line 1433, in OnPouSelectedChanged
window.RefreshView()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 837, in RefreshView
self.RefreshProcessVariables()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 886, in RefreshProcessVariables
slaves = self.Controler.GetSlaves(**self.CurrentNodesFilter)
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/EthercatMaster.py", line 341, in GetSlaves
for slave in self.Config.getConfig().getSlave():
<type 'exceptions.AttributeError'>:_'lxml.etree._Element'_object_has_no_attribute_'getSlave'

Steps to reproduce problem:

- Add new EtherCAT master
- Add new EthercatNode to the master
- double click on


Revert commit "Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension"
[a3ac46366b86a0b237dac93be6b2281ac70b98a8].

The problem was that XML elements (proxy object) in some cases were created using custom XML
classes constructors and lxml.etree.Element() call and live python
patching. This causes that lxml backend doesn't know that custom python class
should be used for these XML elements.
Proxy object can be move/deleted and recreated by lxml
backend at any point in time or this can be done in python by copy/deepcopy operations.
If this happens, then newly created
proxy elements are using default class lxml.etree._Element. And all
custom functionality is lost.

All created XML elements should be always created through corresponding
parser and class lookup callback done by lxml backend.
It's described in more details in lxml documentation:
https://lxml.de/element_classes.html
#!/usr/bin/env python
# -*- coding: utf-8 -*-

# This file is part of Beremiz, a Integrated Development Environment for
# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
#
# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
#
# See COPYING file for copyrights details.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.


# Package initialization

from __future__ import absolute_import

from dialogs.ConnectionDialog import ConnectionDialog
from dialogs.ActionBlockDialog import ActionBlockDialog
from dialogs.FBDBlockDialog import FBDBlockDialog
from dialogs.FBDVariableDialog import FBDVariableDialog
from dialogs.LDElementDialog import LDElementDialog
from dialogs.LDPowerRailDialog import LDPowerRailDialog
from dialogs.SFCStepDialog import SFCStepDialog
from dialogs.SFCStepNameDialog import SFCStepNameDialog
from dialogs.SFCTransitionDialog import SFCTransitionDialog
from dialogs.SFCDivergenceDialog import SFCDivergenceDialog
from dialogs.ForceVariableDialog import ForceVariableDialog
from dialogs.ArrayTypeDialog import ArrayTypeDialog
from dialogs.DurationEditorDialog import DurationEditorDialog
from dialogs.SearchInProjectDialog import SearchInProjectDialog
from dialogs.BrowseLocationsDialog import BrowseLocationsDialog
from dialogs.ProjectDialog import ProjectDialog
from dialogs.PouDialog import PouDialog
from dialogs.PouTransitionDialog import PouTransitionDialog
from dialogs.PouActionDialog import PouActionDialog
from dialogs.FindInPouDialog import FindInPouDialog
from dialogs.BrowseValuesLibraryDialog import BrowseValuesLibraryDialog
from dialogs.DiscoveryDialog import DiscoveryDialog