tests/genericmake/plc.xml
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 24 Aug 2018 13:41:43 +0300
changeset 2297 96ca6b056c55
parent 2296 a2ab363f9e90
permissions -rw-r--r--
Proper 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


Revert commit "Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension"
[a3ac46366b86a0b237dac93be6b2281ac70b98a8].

The problem was that XML elements (proxy object) in some cases were created using custom XML
classes constructors and lxml.etree.Element() call and live python
patching. This causes that lxml backend doesn't know that custom python class
should be used for these XML elements.
Proxy object can be move/deleted and recreated by lxml
backend at any point in time or this can be done in python by copy/deepcopy operations.
If this happens, then newly created
proxy elements are using default class lxml.etree._Element. And all
custom functionality is lost.

All created XML elements should be always created through corresponding
parser and class lookup callback done by lxml backend.
It's described in more details in lxml documentation:
https://lxml.de/element_classes.html
<?xml version='1.0' encoding='utf-8'?>
<project xmlns:ns1="http://www.plcopen.org/xml/tc6_0201" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://www.plcopen.org/xml/tc6_0201">
  <fileHeader companyName="Unknown" productName="Unnamed" productVersion="1" creationDateTime="2014-01-19T11:14:47" contentDescription="This example shows how you can customize build process by using 'make'.&#10;"/>
  <contentHeader name="Makefile Example" modificationDateTime="2018-08-24T13:12:10">
    <coordinateInfo>
      <fbd>
        <scaling x="0" y="0"/>
      </fbd>
      <ld>
        <scaling x="0" y="0"/>
      </ld>
      <sfc>
        <scaling x="0" y="0"/>
      </sfc>
    </coordinateInfo>
  </contentHeader>
  <types>
    <dataTypes/>
    <pous>
      <pou name="program0" pouType="program">
        <interface>
          <localVars>
            <variable name="LocalVara">
              <type>
                <INT/>
              </type>
            </variable>
            <variable name="LocalVarb">
              <type>
                <INT/>
              </type>
            </variable>
          </localVars>
        </interface>
        <body>
          <FBD>
            <inVariable localId="1" executionOrderId="0" height="30" width="77" negated="false">
              <position x="52" y="424"/>
              <connectionPointOut>
                <relPosition x="77" y="15"/>
              </connectionPointOut>
              <expression>LocalVara</expression>
            </inVariable>
            <outVariable localId="2" executionOrderId="0" height="30" width="77" negated="false">
              <position x="167" y="424"/>
              <connectionPointIn>
                <relPosition x="0" y="15"/>
                <connection refLocalId="1">
                  <position x="167" y="439"/>
                  <position x="129" y="439"/>
                </connection>
              </connectionPointIn>
              <expression>LocalVarb</expression>
            </outVariable>
            <comment localId="3" height="385" width="760">
              <position x="32" y="23"/>
              <content>
                <xhtml:p><![CDATA[This example shows how you can customize build process by using 'make'.

Sometimes special steps need to be done to build entire project.
But it's not necessary to create another target in Beremiz every time you need to customize something in build process.  Just use for that 'Generic' target and describe all necessary steps in Makefile. 

For example, you can 
 - preprocess generated by Beremiz C source files, 
 - do some fancy source code transformation using any tools you want, 
 - use any compiler you want,
 - call static analyzers,
 - run integration tests on the project,
 - upload source code to external build server,
 - upload to the target and compile it there,
 - flash/transfer your compiled binary to the target,
 and much much more.
]]></xhtml:p>
              </content>
            </comment>
          </FBD>
        </body>
      </pou>
    </pous>
  </types>
  <instances>
    <configurations>
      <configuration name="config">
        <resource name="resource1">
          <task name="Tsk" priority="0" interval="T#100ms">
            <pouInstance name="Inst" typeName="program0"/>
          </task>
        </resource>
      </configuration>
    </configurations>
  </instances>
</project>