topic Re: IFeatureCursor.NextFeature Leaks Memory (ArcGIS 9.2, VBA) in ArcObjects SDK Questions

IFeatureCursor.NextFeature Leaks Memory (ArcGIS 9.2, VBA)

ManuelF_ — Fri, 18 Jun 2010 06:56:46 GMT

I have this function that gets called many times in a loop:

Private Function FindParcelOfObject(feat As IFeature) As IFeature
    Static fcursor As IFeatureCursor
    Set gSF.Geometry = feat.Shape 'gSF is ISpatialFilter declared at module level
    gSF.SpatialRel = esriSpatialRelWithin
    Set fcursor = gParcels.Search(gSF, True) 'gParcels is IFeatureClass declared at module level
    Set FindParcelOfObject = fcursor.NextFeature 'memory leak
    Set fcursor = Nothing
End Function

The line with NextFeature increases memory usage by about 6K each time it gets called. As the function is called many times, it exhausts memory very quickly. Is there something I do wrong here? Thank you.

Re: IFeatureCursor.NextFeature Leaks Memory (ArcGIS 9.2, VBA)

DuncanHornby — Fri, 18 Jun 2010 08:17:24 GMT

"jmr1973",

Rather than have your SpatialFilter (gSF) declared globally at module level try creating it and destroying it within the procedure itself?

Duncan

Re: IFeatureCursor.NextFeature Leaks Memory (ArcGIS 9.2, VBA)

ManuelF_ — Fri, 18 Jun 2010 09:40:50 GMT

"jmr1973",

Rather than have your SpatialFilter (gSF) declared globally at module level try creating it and destroying it within the procedure itself?

Duncan

Hi Duncan,

Unfortunately, this does not solve my problem. NextFeature is still grabbing a piece of memory with each execution.

Regards,

Re: IFeatureCursor.NextFeature Leaks Memory (ArcGIS 9.2, VBA)

AlexanderGray — Fri, 18 Jun 2010 19:32:31 GMT

Have you tried setting the feature to nothing after you are done with it?

Re: IFeatureCursor.NextFeature Leaks Memory (ArcGIS 9.2, VBA)

DuncanHornby — Fri, 18 Jun 2010 21:15:19 GMT

The only other thing I can tell from your code is the use of the Static keyword for declaring your featurecursor. I've never used Static (mainly out of ignorance in what it does!) I would have used Dim and have never come across the issues you are having, so try swapping that?

Duncan

Re: IFeatureCursor.NextFeature Leaks Memory (ArcGIS 9.2, VBA)

ManuelF_ — Sat, 19 Jun 2010 08:33:42 GMT

The only other thing I can tell from your code is the use of the Static keyword for declaring your featurecursor. I've never used Static (mainly out of ignorance in what it does!) I would have used Dim and have never come across the issues you are having, so try swapping that?

Duncan

Static is there mainly so I don't have to declare a variable at module level as I already have too much of them. Since this function gets called about 10000 times i thought it would be more efficient to declare it like that than use Dim which would allocate memory each time it gets called. Anyway, I tried using Dim, same thing happens.

Re: IFeatureCursor.NextFeature Leaks Memory (ArcGIS 9.2, VBA)

ManuelF_ — Sat, 19 Jun 2010 08:38:56 GMT

Have you tried setting the feature to nothing after you are done with it?

Alexander, I'll have to get back to you Monday as I don't have access to ArcGIS at home... thanks

Re: IFeatureCursor.NextFeature Leaks Memory (ArcGIS 9.2, VBA)

ManuelF_ — Mon, 21 Jun 2010 05:40:12 GMT

Hi Alexander,

I set feature to Nothing and it still does not return memory to system... 😞 Any other ideas?

Re: IFeatureCursor.NextFeature Leaks Memory (ArcGIS 9.2, VBA)

JanDuske — Wed, 30 Jun 2010 08:17:14 GMT

Try to call
gParcels.Search(gSF, False) (not-recycling cursor) instead. The ESRI documentation says that it's forbidden to keep a reference to a row retrieved from a recycling cursor (can't say where I've read this, but I did...). The recycling cursor might even be responsible for the memory leak, since it does not release all its ressources as the non-recycling cursor does.

Re: IFeatureCursor.NextFeature Leaks Memory (ArcGIS 9.2, VBA)

AnilDhiman — Wed, 08 Sep 2010 11:04:07 GMT

Did you ever find solution to this,, I am also facing the such errors.