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.huot...@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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