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NativeLib.xml
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 10 Aug 2018 17:45:33 +0300
changeset 2278 a3ac46366b86
parent 1050 56bef276055e
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))
[-------------------------------------------------------------]
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://www.plcopen.org/xml/tc6.xsd"
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         xsi:schemaLocation="http://www.plcopen.org/xml/tc6.xsd"
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         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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         xmlns:xhtml="http://www.w3.org/1999/xhtml">
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  <fileHeader companyName="Unknown"
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              productName="Unnamed"
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              productVersion="1"
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              creationDateTime="2013-01-29T14:01:00"/>
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  <contentHeader name="Unnamed"
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                 modificationDateTime="2013-02-26T15:59:13">
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    <coordinateInfo>
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      <fbd>
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        <scaling x="0" y="0"/>
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      </fbd>
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      <ld>
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        <scaling x="0" y="0"/>
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      </ld>
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      <sfc>
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        <scaling x="0" y="0"/>
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      </sfc>
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    </coordinateInfo>
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  </contentHeader>
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  <types>
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    <dataTypes>
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      <dataType name="LOGLEVEL">
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        <baseType>
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          <enum>
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            <values>
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              <value name="CRITICAL"/>
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              <value name="WARNING"/>
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              <value name="INFO"/>
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              <value name="DEBUG"/>
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            </values>
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          </enum>
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        </baseType>
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        <initialValue>
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          <simpleValue value="INFO"/>
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        </initialValue>
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      </dataType>
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    </dataTypes>
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    <pous>
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      <pou name="LOGGER" pouType="functionBlock">
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        <interface>
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          <inputVars>
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            <variable name="TRIG">
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              <type>
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                <BOOL/>
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              </type>
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            </variable>
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            <variable name="MSG">
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              <type>
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                <string/>
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              </type>
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            </variable>
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            <variable name="LEVEL">
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              <type>
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                <derived name="LOGLEVEL"/>
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              </type>
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              <initialValue>
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                <simpleValue value="INFO"/>
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              </initialValue>
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            </variable>
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          </inputVars>
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          <localVars>
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            <variable name="TRIG0">
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              <type>
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                <BOOL/>
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              </type>
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            </variable>
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          </localVars>
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        </interface>
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        <body>
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          <ST>
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<![CDATA[IF TRIG AND NOT TRIG0 THEN
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{{
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 LogMessage(GetFbVar(LEVEL),(char*)GetFbVar(MSG, .body),GetFbVar(MSG, .len));
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}}
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END_IF;
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TRIG0:=TRIG;
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]]>
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          </ST>
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        </body>
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      </pou>
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    </pous>
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  </types>
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  <instances>
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    <configurations/>
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  </instances>
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</project>
beremiz