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 subprocess
import wx
import wx.html
HtmlFrameOpened = []
def OpenHtmlFrame(self, title, file, size):
if title not in HtmlFrameOpened:
HtmlFrameOpened.append(title)
window = HtmlFrame(self, HtmlFrameOpened)
window.SetTitle(title)
window.SetHtmlPage(file)
window.SetClientSize(size)
window.Show()
[ID_HTMLFRAME, ID_HTMLFRAMEHTMLCONTENT] = [wx.NewId() for _init_ctrls in range(2)]
EVT_HTML_URL_CLICK = wx.NewId()
class HtmlWindowUrlClick(wx.PyEvent):
def __init__(self, linkinfo):
wx.PyEvent.__init__(self)
self.SetEventType(EVT_HTML_URL_CLICK)
self.linkinfo = (linkinfo.GetHref(), linkinfo.GetTarget())
class UrlClickHtmlWindow(wx.html.HtmlWindow):
""" HTML window that generates and OnLinkClicked event.
Use this to avoid having to override HTMLWindow
"""
def OnLinkClicked(self, linkinfo):
wx.PostEvent(self, HtmlWindowUrlClick(linkinfo))
def Bind(self, event, handler, source=None, id=wx.ID_ANY, id2=wx.ID_ANY):
if event == HtmlWindowUrlClick:
self.Connect(-1, -1, EVT_HTML_URL_CLICK, handler)
else:
wx.html.HtmlWindow.Bind(self, event, handler, source=source, id=id, id2=id2)
class HtmlFrame(wx.Frame):
def _init_ctrls(self, prnt):
self.SetIcon(prnt.icon)
self.Bind(wx.EVT_CLOSE, self.OnCloseFrame)
self.HtmlContent = UrlClickHtmlWindow(id=ID_HTMLFRAMEHTMLCONTENT,
name='HtmlContent', parent=self, pos=wx.Point(0, 0),
size=wx.Size(-1, -1), style=wx.html.HW_SCROLLBAR_AUTO | wx.html.HW_NO_SELECTION)
self.HtmlContent.Bind(HtmlWindowUrlClick, self.OnLinkClick)
def __init__(self, parent, opened):
wx.Frame.__init__(self, id=ID_HTMLFRAME, name='HtmlFrame',
parent=parent, pos=wx.Point(320, 231),
size=wx.Size(853, 616),
style=wx.DEFAULT_FRAME_STYLE, title='')
self._init_ctrls(parent)
self.HtmlFrameOpened = opened
def SetHtmlCode(self, htmlcode):
self.HtmlContent.SetPage(htmlcode)
def SetHtmlPage(self, htmlpage):
self.HtmlContent.LoadPage(htmlpage)
def OnCloseFrame(self, event):
self.HtmlFrameOpened.remove(self.GetTitle())
event.Skip()
def OnLinkClick(self, event):
url = event.linkinfo[0]
try:
if wx.Platform == '__WXMSW__':
import webbrowser
webbrowser.open(url)
elif subprocess.call("firefox %s" % url, shell=True) != 0:
wx.MessageBox("""Firefox browser not found.\nPlease point your browser at :\n%s""" % url)
except ImportError:
wx.MessageBox('Please point your browser at: %s' % url)