images/Transfer.png
author |
Andrey Skvortsov <andrej.skvortzov@gmail.com> |
|
Fri, 10 Aug 2018 17:45:33 +0300 |
changeset 2278 |
a3ac46366b86 |
parent 533 |
25437efb7ae4
|
child 3568 |
494c90b895ad |
permissions |
-rw-r--r-- |
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():
<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
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))
[-------------------------------------------------------------]