Re: wxNotebook and DeleteAllPages()

I'm in the same thread, and not calling from EVT_PAINT.  I tried 
wx.CallAfter, but it returned the same errors.

On Tuesday, April 25, 2017 at 8:45:24 PM UTC-6, Robin Dunn wrote:
>
> PyMapper Developer wrote:
>
> Hello all, 
>     I'm updating older code that was running on python 2.7 and wxpython 
> 2.8.12 to now run on python 3.6 and wxPhoenix.  I have run into the 
> following error messages:
>
> <class 'wx._core.PaintEvent'> returned a result with an error set
>
> wx._core.wxAssertionError: C++ assertion "(int)m_pages.Count() == 
> (int)::SendMessageW((((HWND)GetHWND())), (0x1300 + 4), 0, 0L)" failed at 
> ..\..\src\msw\notebook.cpp(343) in wxNotebook::GetPageCount():
>
> This occurs when I have an active wxNotebook (with any number of pages) 
> where I try to create a new page, after having called the DeleteAllPages() 
> method.  Did the behavior of wxNotebook change somewhere between 2.8.12 and 
> 4.0, or is this a bug in the wxNotebook?
>
>
> It's hard to say for sure but it's possible that there are some internal 
> values (in wx or the native libs) that are in an inconsistent state 
> immediately after a DeleteAllPages and the notebook isn't ready for new 
> pages again until it has cleaned those up. If that's the case then it may 
> help to not add any new pages until after the pending events have been 
> processed. Using wx.CallAfter can help you with that.
>
> The fact that the error is detected while the in the wx.PainEvent code is 
> a red flag for me too... It is possible that the context that you are 
> calling DeleteAllPages in that is the trouble. Do you call it from the 
> EVT_PAINT handler? From another thread?
>
> -- 
> Robin Dunn
> Software Craftsman 
> http://wxPython.org
>

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