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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