topic Re: Count features intersecting buffered geometry - memory leak in ArcObjects SDK Questions

Count features intersecting buffered geometry - memory leak

AndyMarchant — Mon, 01 Dec 2014 18:57:54 GMT

Hi All,

I'm calling the function below several thousand times, but it just seems to increase memory usage until it falls over. I've tried Marshal.ReleaseComObject and ComReleaser without any luck. It seems to be related to the buffered geometry as if I give the non buffered geometry (SiteGeometry) to pSpatialFilter it seems fine.

Any ideas how i release the memory used by this function?

thanks,

Andy

Public Function doSearch(ByVal SiteGeometry As IGeometry, ByVal SearchLayer As IFeatureClass, ByVal Buffer As Integer, ByVal shapeField As String) As Integer

Dim topoOP As ITopologicalOperator2

Dim pSpatialFilter As ISpatialFilter = New SpatialFilter

topoOP = SiteGeometry

topoOP.Simplify()

Dim pGeometryBuff As IGeometry = topoOP.Buffer(Buffer)

With pSpatialFilter

.Geometry = pGeometryBuff

.GeometryField = shapeField

.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects

End With

Dim theRowcount As Integer = SearchLayer.FeatureCount(pSpatialFilter)

topoOP = Nothing

pSpatialFilter = Nothing

pGeometryBuff = Nothing

pBC = Nothing

Return theRowcount

End Function

Re: Count features intersecting buffered geometry - memory leak

DuncanHornby — Sun, 07 Dec 2014 00:52:21 GMT

Your code looks OK to me. Don't know if this will help but maybe you can pass in siteGeometry and SearchLayer as "ByRef" rather than "ByVal"?

Re: Count features intersecting buffered geometry - memory leak

RiverTaig1 — Sun, 07 Dec 2014 02:13:19 GMT

I would try using the SelectionSet method and getting the count off of that. Don't forget to call FinalReleaseComObject on selSet.

IWorkspace ws = ((IDataset)SearchLayer).Workspace;

ISelectionSet selSet = SearchLayer.Select(pSpatialFilter, esriSelectionType.esriSelectionTypeIDSet, esriSelectionOption.esriSelectionOptionNormal, ws);

int rowCount = selSet.Count;

Marshal.FinalReleaseComObject(selSet);

Good luck.

Re: Count features intersecting buffered geometry - memory leak

AndyMarchant — Mon, 08 Dec 2014 09:02:30 GMT

thanks for your suggestions - i eventually managed to reduce the memory leak to an acceptable trickle using comReleaser. Final code is below:

Public Function doSearch(ByVal SiteGeometry As IGeometry, ByVal SearchLayer As IFeatureClass, ByVal Buffer As Integer, ByVal shapeField As String, ByVal thewhere As String) As Boolean

Using comReleaser As ComReleaser = New ComReleaser()

Dim topoOperator As ITopologicalOperator = CType(SiteGeometry, ITopologicalOperator)

comReleaser.ManageLifetime(topoOperator)

Dim buffer2 As IGeometry

If Buffer = 0 Then

buffer2 = SiteGeometry

Else

buffer2 = topoOperator.Buffer(Buffer)

End If

comReleaser.ManageLifetime(buffer2)

Dim spatialFilter As ISpatialFilter = New SpatialFilterClass()

comReleaser.ManageLifetime(spatialFilter)

spatialFilter.Geometry = buffer2

spatialFilter.GeometryField = shapeField

spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects

spatialFilter.WhereClause = thewhere

' Execute the query.

Dim featureCursor As IFeatureCursor = SearchLayer.Search(spatialFilter, True)

comReleaser.ManageLifetime(featureCursor)

Dim feature As IFeature = featureCursor.NextFeature()

comReleaser.ManageLifetime(feature)

If feature Is Nothing Then

Return False

Else

Return True

End If

End Using

End Function