Additional fix for rewrite ForceVariableDialog commit (9076249f)

fix following backtrace:

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk3/wx/_core.py", line 16765, in <lambda>
lambda event: event.callable(*event.args, **event.kw) )
File "/home/developer/WorkData/PLC/beremiz/beremiz/controls/DebugVariablePanel/DebugVariableViewer.py", line 232, in HandleButton
button.ProcessCallback()
File "/home/developer/WorkData/PLC/beremiz/beremiz/controls/DebugVariablePanel/GraphButton.py", line 156, in ProcessCallback
self.Callback()
File "/home/developer/WorkData/PLC/beremiz/beremiz/controls/DebugVariablePanel/DebugVariableViewer.py", line 350, in OnForceButton
self.ForceValue(self.ItemsDict.values()[0])
File "/home/developer/WorkData/PLC/beremiz/beremiz/controls/DebugVariablePanel/DebugVariableViewer.py", line 428, in ForceValue
dialog.GetValue())
File "/home/developer/WorkData/PLC/beremiz/beremiz/dialogs/ForceVariableDialog.py", line 232, in GetValue
return GetTypeValue[self.IEC_Type](wx.TextEntryDialog.GetValue(self))
TypeError: unbound method GetValue() must be called with TextEntryDialog instance as first argument (got ForceVariableDialog instance instead)

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/*

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Template C code used to produce target Ethercat C code.

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Copyright (C) 2011-2014: Laurent BESSARD, Edouard TISSERANT

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Distributed under the terms of the GNU Lesser General Public License as

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published by the Free Software Foundation; either version 2 of the License, or

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(at your option) any later version.

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See COPYING file for copyrights details.

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*/

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#include "iec_types_all.h"

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#define FREE 0

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#define ACQUIRED 1

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#define ANSWERED 2

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long SDOLock = FREE;

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extern long AtomicCompareExchange(long* atomicvar,long compared, long exchange);

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int AcquireSDOLock() {

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	return AtomicCompareExchange(&SDOLock, FREE, ACQUIRED) == FREE;

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}

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void SDOAnswered() {

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	AtomicCompareExchange(&SDOLock, ACQUIRED, ANSWERED);

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}

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int HasAnswer() {

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	return SDOLock == ANSWERED;

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}

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void ReleaseSDOLock() {

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	AtomicCompareExchange(&SDOLock, ANSWERED, FREE);

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}

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int __init_etherlab_ext()

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{

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    SDOLock = FREE;

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    return 0;

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}

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void __cleanup_etherlab_ext()

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{

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}

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void __retrieve_etherlab_ext()

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{

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}

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void __publish_etherlab_ext()

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{

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}