[mapserver-users] System.AccessViolationException on mapscriptPINVOKE.delete_symbolObj

[Umberto Nicoletti]

John,
please open an issue on https://github.com/mapserver/mapserver/issues
It will help greatly if you could attach a small test case so that we can
reproduce the issue and track the cause.

Thanks,
Umberto



On Wed, Dec 5, 2012 at 12:34 AM, Huotari, John B (RCIS) <
John.Huotari at rcis.com> wrote:

>  I’m using C Sharp MapScript to access MapServer (MS4W 3.0.6).  I’m
> creating a new mapObj from an almost empty MAPFILE and then dynamically add
> layers to the map and then calling draw to generate an image.  I’m also
> dynamically adding symbolObjs to the map’s symbolset for the layers to
> reference.  This all works great the vast majority of the time, but on rare
> occasions, sometime after the map has been generated, I receive the
> following AccessViolationException when garbage collection is attempting to
> clean up the MapServer objects.****
>
> ** **
>
> System.AccessViolationException was unhandled****
>
>   Message=Attempted to read or write protected memory. This is often an
> indication that other memory is corrupt.****
>
>   Source=mapscript_csharp****
>
>   StackTrace:****
>
>        at OSGeo.MapServer.mapscriptPINVOKE.delete_symbolObj(HandleRef
> jarg1)****
>
>        at OSGeo.MapServer.symbolObj.Dispose()****
>
>        at OSGeo.MapServer.symbolObj.Finalize()****
>
>   InnerException:****
>
> ** **
>
> ** **
>
> I’ve tried disposing of the map itself, its symbolset, as well as each
> symbolObj item in that symbolset by calling Dispose on each, but doing so
> neither causes the error to happen immediately upon calling Dispose
> (instead it still only happens when garbage collection runs) nor does it do
> anything to resolve the issue.  I don’t see any reference to symbolObj in
> the map layers (looks like it just holds a symbol name and/or index) nor
> anywhere else that stands out as a logical place to look, so I don’t see
> anything else to dispose.  Does anyone have any idea of where I could look
> for any symbolObjs which have been allocated so I can dispose of them so
> that garbage collection does not choke when attempting to dispose of them
> for me?  Am I barking up the wrong tree and should be looking somewhere
> else entirely rather than focusing on symbolObj?****
>
> ** **
>
> Thanks for any guidance that can be provided,****
>
> John****
>
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>
>
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