Mac - Memory Error with TextBoxes

[Kenneth Bongort]

Ok, thanks! Do you have any suggestions as to how I might update my  
TextBoxes at timed intervals, without updating them directly from a  
separate thread?

- Ken

On Mar 2, 2008, at 6:04 AM, Stefan Csomor wrote:

> Hi
>
> you cannot directly update a gui object on OS X form a secondary  
> thread
> without expecting problems down the road... I've only expanded the
> wxTextCtrl:: WriteText method to internally make a remote call from a
> secondary thread, all other methods should only be called from the  
> main
> thread.
>
> Best,
>
> Stefan
>
>
> On 3/1/08 9:13 PM, "Kenneth Bongort" <kjb79 at cornell.edu> wrote:
>
>> Sorry it took so long in coming, but here's a pared-down script. The
>> stack trace I get when I run it is pasted below.
>>
>> Thanks!
>> Ken
>>
>>
>>
>> On Feb 26, 2008, at 4:06 PM, Robin Dunn wrote:
>>
>>> Kenneth Bongort wrote:
>>>> Hello Everyone,
>>>> I'm using wxPython to create a GUI, but I'm running into an error
>>>> that seems to stem from updating TextBoxes. My program rapidly
>>>> updates several TextBoxes, and this error always occurs after some
>>>> period of time. I suspect it's a problem in wxWidgets for the Mac.
>>>> Does anyone know about this issue? I pasted a stack trace below.
>>>
>>> Can you reproduce the problem in a small runnable sample app?
>>>
>>> -- 
>>> Robin Dunn
>>> Software Craftsman
>>> http://wxPython.org  Java give you jitters?  Relax with wxPython!
>>>
>>>
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>>
>> Program received signal EXC_BAD_ACCESS, Could not access memory.
>> Reason: KERN_PROTECTION_FAILURE at address: 0x00000016
>> 0x90041214 in THIThemeTextInfoPublic::GetTruncation ()
>> (gdb) bt
>> #0  0x90041214 in THIThemeTextInfoPublic::GetTruncation ()
>> #1  0x900419c8 in TCoreTextEngine::GetTextInfoOutputParameters ()
>> #2  0x90046fbc in TCoreTextEngine::DrawThemeTextBox ()
>> #3  0x900467c4 in DataEngine::DrawTextBox ()
>> #4  0x90046574 in HIThemeDrawTextBox ()
>> #5  0x901fdc70 in HIMenuBarView::DrawTextTitle ()
>> #6  0x900456fc in HIMenuBarView::DrawSelf ()
>> #7  0x90044e5c in HIView::DrawCacheOrSelf ()
>> #8  0x90044c7c in HIView::SendDraw ()
>> #9  0x9004493c in HIView::RecursiveDrawComposited ()
>> #10 0x90044a3c in HIView::RecursiveDrawComposited ()
>> #11 0x90043be4 in HIView::DrawComposited ()
>> #12 0x90043104 in WindowData::PrepareForVisibility ()
>> #13 0x900427f0 in _ShowHideWindows ()
>> #14 0x900426cc in ShowHide ()
>> #15 0x90042630 in MBarDraw ()
>> #16 0x9002df68 in ShowBar ()
>> #17 0x9004ed68 in SetMenuBarObscured ()
>> #18 0x9004e7a8 in HIApplication::HandleActivated ()
>> #19 0x9004c85c in HIApplication::EventObserver ()
>> #20 0x90020528 in _NotifyEventLoopObservers ()
>> #21 0x9004c478 in AcquireEventFromQueue ()
>> #22 0x9004a160 in ReceiveNextEventCommon ()
>> #23 0x018c3b40 in wxApp::MacDoOneEvent ()
>> #24 0x018d9048 in wxEventLoop::Dispatch ()
>> #25 0x01980e84 in wxEventLoopManual::Run ()
>> #26 0x0195a2c8 in wxAppBase::MainLoop ()
>> #27 0x00a61a2c in wxPyApp::MainLoop (this=0x85e750) at src/ 
>> helpers.cpp:
>> 156
>> #28 0x00aae204 in _wrap_PyApp_MainLoop (args=0x8eba10) at src/mac/
>> _core_wrap.cpp:30914
>> #29 0x003ed0e4 in PyObject_Call (func=0x8eba10, arg=0x8eba10, kw=0x0)
>> at /Volumes/Data/Users/ronald/Projects/python/wrk/r251/Objects/
>> abstract.c:1860
>> #30 0x004925c8 in PyEval_EvalFrameEx (f=0x1720cce0,
>> throwflag=55197296) at /Volumes/Data/Users/ronald/Projects/python/ 
>> wrk/
>> r251/Python/ceval.c:3844
>> #31 0x00493e10 in PyEval_EvalCodeEx (co=0x955ec0, globals=0x8eba10,
>> locals=0x90041210, args=0x34a3ddc, argcount=1, kws=0x0, kwcount=0,
>> defs=0x0, defcount=0, closure=0x0) at /Volumes/Data/Users/ronald/
>> Projects/python/wrk/r251/Python/ceval.c:2831
>> #32 0x004171f8 in function_call (func=0xfd8c30, arg=0x34a3dd0,  
>> kw=0x0)
>> at /Volumes/Data/Users/ronald/Projects/python/wrk/r251/Objects/
>> funcobject.c:517
>> #33 0x003ed0e4 in PyObject_Call (func=0x8eba10, arg=0x8eba10, kw=0x0)
>> at /Volumes/Data/Users/ronald/Projects/python/wrk/r251/Objects/
>> abstract.c:1860
>> #34 0x003f7d6c in instancemethod_call (func=0x8eba10, arg=0x34a3dd0,
>> kw=0x0) at /Volumes/Data/Users/ronald/Projects/python/wrk/r251/ 
>> Objects/
>> classobject.c:2497
>> #35 0x003ed0e4 in PyObject_Call (func=0x8eba10, arg=0x8eba10, kw=0x0)
>> at /Volumes/Data/Users/ronald/Projects/python/wrk/r251/Objects/
>> abstract.c:1860
>> #36 0x00491f94 in PyEval_EvalFrameEx (f=0x1720ca60,
>> throwflag=55197136) at /Volumes/Data/Users/ronald/Projects/python/ 
>> wrk/
>> r251/Python/ceval.c:3775
>> #37 0x00491e74 in PyEval_EvalFrameEx (f=0x80af40,  
>> throwflag=388024928)
>> at /Volumes/Data/Users/ronald/Projects/python/wrk/r251/Python/ 
>> ceval.c:
>> 3650
>> #38 0x00493e10 in PyEval_EvalCodeEx (co=0xa0770, globals=0x8eba10,
>> locals=0x90041210, args=0x0, argcount=0, kws=0x0, kwcount=0,  
>> defs=0x0,
>> defcount=0, closure=0x0) at /Volumes/Data/Users/ronald/Projects/ 
>> python/
>> wrk/r251/Python/ceval.c:2831
>> #39 0x00493fb0 in PyEval_EvalCode (co=0x8eba10, globals=0x8eba10,
>> locals=0x0) at /Volumes/Data/Users/ronald/Projects/python/wrk/r251/
>> Python/ceval.c:494
>> #40 0x004b9cbc in PyRun_FileExFlags (fp=0xa01d1dac,
>> filename=0xbffff751 "logui/ErrorDemo.py", start=657264,
>> globals=0x6dd20, locals=0x6dd20, closeit=1, flags=0xbffff488) at /
>> Volumes/Data/Users/ronald/Projects/python/wrk/r251/Python/ 
>> pythonrun.c:
>> 1271
>> #41 0x004b9f00 in PyRun_SimpleFileExFlags (fp=0xa01d1dac,
>> filename=0xbffff751 "logui/ErrorDemo.py", closeit=1,  
>> flags=0xbffff488)
>> at /Volumes/Data/Users/ronald/Projects/python/wrk/r251/Python/
>> pythonrun.c:877
>> #42 0x004c98bc in Py_Main (argc=2, argv=0xbffff61c) at /Volumes/Data/
>> Users/ronald/Projects/python/wrk/r251/Modules/main.c:523
>> #43 0x000019bc in ?? ()
>>
>>
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