I have an application to Track Vehicles on the Map. We Draw Shapes with the mouse on the Map to divide the city into zones. The vehicles are created as push pins in a specific DataSet.
When we Query a Shape, the results are returned Ok. But after peforming the QueryShape several hundred times, MapPoint Crashs.

I am attaching some code for review. If this code is called from a for loop statement the error will appear almost within 3-4 minutes:

Public Function MapGenerateVehicleInAZoneList(lngZoneNumber As Long) As Boolean

Dim TZoneFeature As ZONE_FEATURE
Dim blnOk As Boolean
Dim strFunctionName As String

strFunctionName = vbNewLine & "MapGenerateVehicleInAZoneList"

On Error GoTo Err_MapGenerateVehicleInAZoneList

blnOk = False

If ZDReadZoneRecordFromArray(lngZoneNumber, TZoneFeature) = True Then

blnOk = MapGenerateVehiclesWithinAFeatureList(TZoneFeature .oShape)

End If

Exit_MapGenerateVehicleInAZoneList:
MapGenerateVehicleInAZoneList = blnOk
Exit Function

Err_MapGenerateVehicleInAZoneList:
MsgBox Err.Description & strFunctionName
Resume Exit_MapGenerateVehicleInAZoneList

End Function



Public Function MapGenerateVehiclesWithinAFeatureList(oShape As MapPointCtl.Shape) As Boolean

Dim TTempVehicleRecord As VEHICALE_RECORD
Dim intNumVehiclesFound As Integer
Dim intRecordNumber As Integer
Dim blnOk As Boolean
Dim objRecords As MapPointCtl.Recordset
Dim strFunctionName As String

strFunctionName = vbNewLine & "MapGenerateVehiclesWithinAFeatureList"

On Error GoTo Err_MapGenerateVehiclesWithinAFeatureList

blnOk = False
intNumVehiclesFound = 0
ReDim TVehicleListReported(1)

'THIS LINE CAUSES THE PROBLEM. AFTER FIXED NUMBER OF CALLS
Set objRecords = frmMain.Map1.ActiveMap.DataSets(STR_VEHICLES_PLOT_ DATA_SET).QueryShape(oShape)

If objRecords.BOF = False Then

objRecords.MoveFirst

' Add results of search to results list box control
Do While Not objRecords.EOF
If objRecords.Pushpin.Name <> "0" Then
If CRGetVehicleRecordNumber(objRecords.Pushpin.Name, intRecordNumber, False) = True Then
Call CRReadRecord(intRecordNumber, TTempVehicleRecord)
intNumVehiclesFound = intNumVehiclesFound + 1
ReDim Preserve TVehicleListReported(intNumVehiclesFound)
TVehicleListReported(intNumVehiclesFound).strVehic leNumber = CStr(objRecords.Pushpin.Name)
TVehicleListReported(intNumVehiclesFound).strLastT imeUpdated = RTrim$(TTempVehicleRecord.strLastTimeUpdated)
End If
End If
objRecords.MoveNext
Loop
End If


Call CMNUpdateNumOfVehiclesReported(intNumVehiclesFound )
blnOk = True

Exit_MapGenerateVehiclesWithinAFeatureList:
MapGenerateVehiclesWithinAFeatureList = blnOk
Exit Function

Err_MapGenerateVehiclesWithinAFeatureList:
MsgBox Err.Description & strFunctionName
Resume Exit_MapGenerateVehiclesWithinAFeatureList



End Function


Please advise

Hi
i'm not much expert about mappoint but it' seems as you fill the memory.
Pheraps you must set to nothing objRecords or unload from the memory the records you don't use again.

bye

Achille

Originally Posted by Anonymous

Hi
i'm not much expert about mappoint but it' seems as you fill the memory.
Pheraps you must set to nothing objRecords or unload from the memory the records you don't use again.

bye

Achille

Thanks for the advise. I have tried that, but it didn't help at all.
Just a quick question, why would the use of Nothing help, when the objRecords ( RecordSet ) is declared locally to a function call?

Thanks