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tests/canopen_master/plc.xml
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 10 Aug 2018 17:45:33 +0300
changeset 2278 a3ac46366b86
parent 436 c926a8037adc
child 2346 ac16bad593cf
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:xsi="http://www.w3.org/2001/XMLSchema-instance"
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         xmlns="http://www.plcopen.org/xml/tc6.xsd"
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         xmlns:xhtml="http://www.w3.org/1999/xhtml"
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         xsi:schemaLocation="http://www.plcopen.org/xml/tc6.xsd">
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  <fileHeader companyName="beremiz"
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              productName="beremiz"
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              productVersion="1"
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              creationDateTime="2008-06-24T18:44:00"/>
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  <contentHeader name="canopen_master"
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                 modificationDateTime="2009-10-07T18:45:11"
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                 language="en-US">
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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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    <pous>
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      <pou name="test_main" pouType="program">
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        <interface>
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          <localVars>
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            <variable name="PLC_OUT" address="%QW0.0.2.8193.0">
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              <type>
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                <INT/>
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              </type>
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            </variable>
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            <variable name="PLC_IN" address="%IW0.0.2.8192.0">
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              <type>
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                <INT/>
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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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          <FBD>
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            <outVariable localId="1" height="29" width="80">
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              <position x="362" y="140"/>
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              <connectionPointIn>
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                <relPosition x="0" y="14"/>
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                <connection refLocalId="4" formalParameter="OUT">
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                  <position x="362" y="154"/>
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                  <position x="330" y="154"/>
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                  <position x="330" y="153"/>
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                  <position x="299" y="153"/>
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                </connection>
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              </connectionPointIn>
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              <expression>PLC_OUT</expression>
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            </outVariable>
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            <inVariable localId="2" height="29" width="20">
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              <position x="100" y="115"/>
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              <connectionPointOut>
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                <relPosition x="20" y="14"/>
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              </connectionPointOut>
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              <expression>1</expression>
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            </inVariable>
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            <block localId="4" width="75" height="60" typeName="ADD">
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              <position x="224" y="123"/>
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              <inputVariables>
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                <variable formalParameter="IN1">
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                  <connectionPointIn>
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                    <relPosition x="0" y="30"/>
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                    <connection refLocalId="2">
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                      <position x="224" y="153"/>
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                      <position x="183" y="153"/>
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                      <position x="183" y="129"/>
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                      <position x="120" y="129"/>
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                    </connection>
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                  </connectionPointIn>
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                </variable>
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                <variable formalParameter="IN2">
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                  <connectionPointIn>
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                    <relPosition x="0" y="50"/>
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                    <connection refLocalId="5">
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                      <position x="224" y="173"/>
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                      <position x="199" y="173"/>
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                      <position x="199" y="201"/>
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                      <position x="174" y="201"/>
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                    </connection>
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                  </connectionPointIn>
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                </variable>
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              </inputVariables>
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              <inOutVariables/>
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              <outputVariables>
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                <variable formalParameter="OUT">
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                  <connectionPointOut>
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                    <relPosition x="75" y="30"/>
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                  </connectionPointOut>
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                </variable>
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              </outputVariables>
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            </block>
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            <inVariable localId="5" height="29" width="70">
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              <position x="104" y="187"/>
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              <connectionPointOut>
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                <relPosition x="70" y="14"/>
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              </connectionPointOut>
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              <expression>PLC_IN</expression>
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            </inVariable>
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          </FBD>
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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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      <configuration name="conf">
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        <resource name="res">
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          <task name="tache" interval="t#50ms" priority="0">
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            <pouInstance name="toto" typeName="test_main"/>
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          </task>
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        </resource>
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      </configuration>
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    </configurations>
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  </instances>
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</project>
beremiz