Re[2]: [0.21] Refcounting problem with Wx::Grid::RegisterDataType

On Tue, 4 Jan 2005 14:50:53 -0500 Cheetah <fastcat@xxxxxxxxx> wrote:

> On Thu, 30 Dec 2004 20:43:49 -0500, Cheetah <fastcat@xxxxxxxxx> wrote:
> > After doing some more detailed digging and experimenting, it seems
> > that only the renderer needs to be forcibly preserved.  Also,
> > wxWidgets itself seems to do some refcounting of the editors and
> > renderers, but that all seems to be in order, or at least the same
> > between the two, and likewise in the wxPerl sourcecode.
> 
> I think I've shone some more light on the problem.  The code for
> SetDefaultRenderer/Editor calls IncRef to prevent the object from
> being deleted when the perl object goes out of scope.  However,
> RegisterDataType does not, nor does the underlying wxWidgets code. 
> So, I think something like the following should help:
> 
> --- ../ascii-debug/Wx-0.21/ext/grid/XS/Grid.xs  2004-11-23
> 17:10:54.000000000 -0500
> +++ Wx-0.21/ext/grid/XS/Grid.xs 2005-01-04 14:35:57.566713900 -0500
> @@ -621,6 +621,10 @@
>      wxString typeName
>      wxGridCellRenderer* renderer
>      wxGridCellEditor* editor
> +  CODE:
> +    renderer->IncRef();
> +    editor->IncRef();
> +    THIS->RegisterDataType( typeName, renderer, editor );
>  
>  void
>  wxGrid::SaveEditControlValue()
> 
> I'm waiting for compiles to finish to test this.  My rudimentary test
> to see if I had the right idea was to change my custom grid/table
> classes to temporarily do everything as strings instead of longs, and
> then use the SetDefaultEditor/Renderer methods, which indeed made my
> crashes go away.

  I added this to my local copy. I am just waiting for your OK
to commit it.

Thanks!
Mattia



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