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tests/python/c_code@c_ext/cfile.xml
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Tue, 26 Jun 2018 17:34:15 +0300
changeset 2229 3c94bac4526e
parent 1463 de311ffe3961
permissions -rw-r--r--
Fix 'DoGetTextExtent - invalid DC' error

most likely this error happens only on certain wx backends.
GTK3+ on GNU/Linux is apparently one of them.
The problem is described in wxWidgets issue tracker.
http://trac.wxwidgets.org/ticket/12486

[-------------------------------------------------------------------------------------------------------------------]
platform:
Linux-4.16.0-2-rt-amd64-x86_64-with-debian-buster-sid

python-version:
2.7.15

traceback:
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 1605, in DispatchDebugValuesProc
self.CallWeakcallables("__tick__", "NewDataAvailable", debug_ticks)
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 1585, in CallWeakcallables
function(*cargs)
File "/home/developer/WorkData/PLC/beremiz/beremiz/editors/Viewer.py", line 1217, in NewDataAvailable
refresh_rect.Union(element.GetRedrawRect())
File "/home/developer/WorkData/PLC/beremiz/beremiz/graphics/GraphicCommons.py", line 1609, in GetRedrawRect
self.ValueSize = self.Parent.GetMiniTextExtent(self.ComputedValue)
File "/home/developer/WorkData/PLC/beremiz/beremiz/editors/Viewer.py", line 932, in GetMiniTextExtent
return self.MiniTextDC.GetTextExtent(text)
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk3/wx/_gdi.py", line 4127, in GetTextExtent
return _gdi_.DC_GetTextExtent(*args, **kwargs)
<class 'wx._core.PyAssertionError'>: C++ assertion "m_graphicContext" failed at ../src/common/dcgraph.cpp(1160) in DoGetTextExtent(): wxGCDC(cg)::DoGetTextExtent - invalid DC

wx-platform:
__WXGTK__

wx-version:
3.0.2.0

[-------------------------------------------------------------------------------------------------------------------]

traceback:
File "/home/developer/WorkData/PLC/beremiz/beremiz/controls/LogViewer.py", line 740, in OnMessageToolTipTimer
self.MessageToolTip.SetFont(self.Font)
File "/home/developer/WorkData/PLC/beremiz/beremiz/controls/CustomToolTip.py", line 75, in SetFont
self.RefreshTip()
File "/home/developer/WorkData/PLC/beremiz/beremiz/controls/CustomToolTip.py", line 158, in RefreshTip
self.SetClientSize(self.GetToolTipSize())
File "/home/developer/WorkData/PLC/beremiz/beremiz/controls/CustomToolTip.py", line 145, in GetToolTipSize
w, h = dc.GetTextExtent(line)
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk3/wx/_gdi.py", line 4127, in GetTextExtent
return _gdi_.DC_GetTextExtent(*args, **kwargs)
<class 'wx._core.PyAssertionError'>: C++ assertion "m_graphicContext" failed at ../src/common/dcgraph.cpp(1160) in DoGetTextExtent(): wxGCDC(cg)::DoGetTextExtent - invalid DC

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<?xml version='1.0' encoding='utf-8'?>
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<CFile xmlns:xhtml="http://www.w3.org/1999/xhtml">
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  <includes>
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    <xhtml:p><![CDATA[
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]]></xhtml:p>
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  </includes>
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  <variables>
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    <variable name="TestInput" type="SINT" initial="0"/>
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    <variable name="TestOutput" type="SINT"/>
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  </variables>
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  <globals>
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    <xhtml:p><![CDATA[
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volatile long Lock=0;
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volatile char PtoC=1,CtoP=2;
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extern long AtomicCompareExchange(long*,long, long);








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extern char *PLC_ID;








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int Simple_C_Call(int val){













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  return val+1;








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}








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int Python_to_C_Call(char toC, char *fromC){








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  /* Code called by python should never touch to 













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     variables modified by PLC thread directly













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     AtomicCompareExchange comes from 













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     beremiz' runtime implementation */













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  int res = 0;








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  if(!AtomicCompareExchange((long*)&Lock, 0, 1)){








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    PtoC=toC;













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    *fromC=CtoP;








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    AtomicCompareExchange((long*)&Lock, 1, 0);








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    res=1;













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  }













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  printf("C code called by Python: toC %d fromC %d\n",toC,*fromC);








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  printf("PLC_ID id %s\n",PLC_ID);








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  return res;













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}













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int PLC_C_Call(char fromPLC, char *toPLC){








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  /* PLC also have to be realy carefull not to 













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     conflict with asynchronous python access */








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  if(!AtomicCompareExchange((long*)&Lock, 0, 1)){








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      CtoP = fromPLC;













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      *toPLC = PtoC;








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      AtomicCompareExchange((long*)&Lock, 1, 0);








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      return 1;













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  }













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  return 0;








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}








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]]></xhtml:p>








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    54


  </globals>













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    55


  <initFunction>








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Edouard Tisserant


parents: 
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diff
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    56


    <xhtml:p><![CDATA[













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Edouard Tisserant


parents: 
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]]></xhtml:p>








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    58


  </initFunction>













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    59


  <cleanUpFunction>








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611fded24ce4
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Edouard Tisserant


parents: 
1125

diff
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    60


    <xhtml:p><![CDATA[













611fded24ce4
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Edouard Tisserant


parents: 
1125

diff
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]]></xhtml:p>








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  </cleanUpFunction>













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    63


  <retrieveFunction>








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parents: 
1125

diff
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    64


    <xhtml:p><![CDATA[













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]]></xhtml:p>








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  </retrieveFunction>













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    67


  <publishFunction>








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611fded24ce4
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Edouard Tisserant


parents: 
1125

diff
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    68


    <xhtml:p><![CDATA[








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if(!AtomicCompareExchange((long*)&Lock, 0, 1)){








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    70


    TestInput = CtoP + PtoC + TestOutput;








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    AtomicCompareExchange((long*)&Lock, 1, 0);








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    72


}








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    73


]]></xhtml:p>








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  </publishFunction>








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    75


</CFile>













beremiz