beremiz

Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension

2018-08-10, Andrey Skvortsov
a3ac46366b86
Dirty 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():
:_'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


this is looks like dirty hack to fix strange problem with initial[0]
changing its type after returning from _init_ method to lxml.etree._Element
As a result all methods generated by class factory are lost.

For example, in function initMethod initial[0].__class__ points to
xmlclass.xmlclass.Config. After map(self.append, initial)
self.Config.__class__ is 'xmlclass.xmlclass.Config' as well.
But after returning from initMethod (_init) in CreateElement
self.Config.__class__ has changed to lxml.etree._Element.


I've noticed similar behavior if copy/deepcopy is used for any child
of etree.ElementBase. See simple example below.
[-------------------------------------------------------------]
#!/usr/bin/python

from __future__ import print_function
from lxml import etree
import copy

class DefaultElementClass(etree.ElementBase):
def getLocalTag(self):
return etree.QName(self.tag).localname


def printInformation(x):
print(x, x.__class__, "getLocalTag" in dir(x))


a = DefaultElementClass()
printInformation(a)

#
printInformation(copy.copy(a))
printInformation(copy.deepcopy(a))
[-------------------------------------------------------------]
#!/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.
from __future__ import absolute_import
import wx
import wx.gizmos
class CustomEditableListBox(wx.gizmos.EditableListBox):
def __init__(self, *args, **kwargs):
wx.gizmos.EditableListBox.__init__(self, *args, **kwargs)
listbox = self.GetListCtrl()
listbox.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)
listbox.Bind(wx.EVT_LIST_BEGIN_LABEL_EDIT, self.OnLabelBeginEdit)
listbox.Bind(wx.EVT_LIST_END_LABEL_EDIT, self.OnLabelEndEdit)
for button, tooltip, call_function in [
(self.GetEditButton(), _("Edit item"), "_OnEditButton"),
(self.GetNewButton(), _("New item"), "_OnNewButton"),
(self.GetDelButton(), _("Delete item"), "_OnDelButton"),
(self.GetUpButton(), _("Move up"), "_OnUpButton"),
(self.GetDownButton(), _("Move down"), "_OnDownButton")]:
button.SetToolTipString(tooltip)
button.Bind(wx.EVT_BUTTON, self.GetButtonPressedFunction(call_function))
self.Editing = False
def EnsureCurrentItemVisible(self):
listctrl = self.GetListCtrl()
listctrl.EnsureVisible(listctrl.GetFocusedItem())
def OnLabelBeginEdit(self, event):
self.Editing = True
func = getattr(self, "_OnLabelBeginEdit", None)
if func is not None:
func(event)
else:
event.Skip()
def OnLabelEndEdit(self, event):
self.Editing = False
func = getattr(self, "_OnLabelEndEdit", None)
if func is not None:
func(event)
else:
event.Skip()
def GetButtonPressedFunction(self, call_function):
def OnButtonPressed(event):
if wx.Platform != '__WXMSW__' or not self.Editing:
func = getattr(self, call_function, None)
if func is not None:
func(event)
wx.CallAfter(self.EnsureCurrentItemVisible)
else:
wx.CallAfter(self.EnsureCurrentItemVisible)
event.Skip()
return OnButtonPressed
def OnKeyDown(self, event):
button = None
keycode = event.GetKeyCode()
if keycode in (wx.WXK_ADD, wx.WXK_NUMPAD_ADD):
button = self.GetNewButton()
elif keycode in (wx.WXK_DELETE, wx.WXK_NUMPAD_DELETE):
button = self.GetDelButton()
elif keycode == wx.WXK_UP and event.ShiftDown():
button = self.GetUpButton()
elif keycode == wx.WXK_DOWN and event.ShiftDown():
button = self.GetDownButton()
elif keycode == wx.WXK_SPACE:
button = self.GetEditButton()
if button is not None and button.IsEnabled():
button.ProcessEvent(wx.CommandEvent(wx.EVT_BUTTON.typeId, button.GetId()))
else:
event.Skip()