Latest Contributions by MarkCederholm

When I attempt to use arcpy.da to add junction features to a geometric network, I get the error "error return without exception set."  Here's the code in question: def Migrate_GasLamp_DA():     sSourceClass = sSourceGDB + "/gaslight"     sTargetClass = "GasLamp"     SourceFieldList = ["SHAPE@", "PLACEMENT_CODE"]     TargetFieldList = ["SHAPE@", "ENABLED", "CREATIONUSER", \                        "DATECREATED", "DATEMODIFIED", "LASTUSER"]     dtCreate = datetime.now().replace(hour=0, minute=0, second=0, microsecond=0)     edit = da.Editor(sTargetGDB)     edit.startEditing(False, False)     edit.startOperation()     c = da.InsertCursor(sTargetClass, TargetFieldList)     iTotal = 0     i = 0     with da.SearchCursor(sSourceClass, SourceFieldList) as cursor:         for row in cursor:             iTotal += 1             i += 1             if i == 1000:                 edit.stopOperation()                 edit.startOperation()                 i = 0             geom = row[0]             sPC = row[1]             tok = UserDateFromPC(sPC)             sUser = tok[0]             dtPC = tok[1]             newrow = [geom, 1, "Data Migration", dtCreate, \                       dtPC, sUser]             c.insertRow(newrow)     del c     edit.stopOperation()     edit.stopEditing(True)     return iTotal The above code works fine if the target feature class does not participate in a geometric network.  When I use ArcObjects instead of arcpy.da, I have no troubles: def Migrate_GasLamp_AO():     GetESRIModule("esriGeoDatabase.olb")     GetESRIModule("esriDataSourcesGDB.olb")     import comtypes.gen.esriGeoDatabase as esriGeoDatabase     import comtypes.gen.esriDataSourcesGDB as esriDataSourcesGDB     pWSF = NewObj(esriDataSourcesGDB.FileGDBWorkspaceFactory, \                   esriGeoDatabase.IWorkspaceFactory)     pSourceWS = pWSF.OpenFromFile(sSourceGDB, 0)     pSourceFWS = CType(pSourceWS, esriGeoDatabase.IFeatureWorkspace)     pTargetWS = pWSF.OpenFromFile(sTargetGDB, 0)     pTargetFWS = CType(pTargetWS, esriGeoDatabase.IFeatureWorkspace)     pSourceFC = pSourceFWS.OpenFeatureClass("gaslight")     pTargetFC = pTargetFWS.OpenFeatureClass("GasLamp")     iPC = pSourceFC.FindField("PLACEMENT_CODE")     iEn = pTargetFC.FindField("ENABLED")     iCU = pTargetFC.FindField("CREATIONUSER")     iDC = pTargetFC.FindField("DATECREATED")     iDM = pTargetFC.FindField("DATEMODIFIED")     iLU = pTargetFC.FindField("LASTUSER")     dtCreate = datetime.now().replace(hour=0, minute=0, second=0, microsecond=0)     pFCursor = pSourceFC.Search(None, True)     iTotal = 0     i = 0     pEditWS = CType(pTargetWS, esriGeoDatabase.IWorkspaceEdit)     pEditWS.StartEditing(False)     pEditWS.StartEditOperation()     while True:         pSourceFeat = pFCursor.NextFeature()         if not pSourceFeat:             break         iTotal += 1         i += 1         if i == 1000:             pEditWS.StopEditOperation()             pEditWS.StartEditOperation()             i = 0         sPC = pSourceFeat.Value(iPC)         tok = UserDateFromPC(sPC)         sUser = tok[0]         dtPC = tok[1]         pTargetFeat = pTargetFC.CreateFeature()         pTargetFeat.Shape = pSourceFeat.Shape         pTargetFeat.Value[iEn] = 1         pTargetFeat.Value[iCU] = "Data Migration"         pTargetFeat.Value[iDC] = dtCreate         pTargetFeat.Value[iDM] = dtPC         pTargetFeat.Value[iLU] = sUser         pTargetFeat.Store()     pEditWS.StopEditOperation()     pEditWS.StopEditing(True)     return iTotal Is there a limitation to arcpy.da that I can't find in the documentation? ... View more

I'd like to see more SQL functionality in the file geodatabase API, including more SQL functions (e.g. DISTINCT), joins, aliases, etc. ... View more

I would not normally start an edit session programmatically while listening for an onCreateFeature event, but this problem was brought to my attention and I was able to duplicate it.  If I have a Python add-in consisting of an extension which listens for the onCreateFeature event, and a button which calls the Editor (through comtypes) to start an edit session, an Access Violation error will result when the button attempts to start the edit session.  If the extension is deactivated, the error doesn't occur. If I start the edit session from a separate Python instance while the extension is active, the error doesn't occur either.  This leads me to believe that whatever mechanism is used to listen for Editor events is causing some sort of contention in the Python engine when simultaneously manipulating the Editor object.  What do you think? ... View more

I wanted to create a marker symbol that centers a label beneath the point.  I eventually came up with the following, which works, but I'd like to know if there's a better approach that I'm not seeing, especially one that's pure XAML.  Thanks! <Window.Resources> <src:CanvasLeftMidpointOffsetter x:Key="LeftOffsetter" /> <esri:MarkerSymbol x:Key="CenterLabelSymbol">    <esri:MarkerSymbol.ControlTemplate>     <ControlTemplate>      <Canvas>      <Ellipse Canvas.Top="-6" Canvas.Left="-6" Width="12" Height="12" Fill="Black"        HorizontalAlignment="Center" VerticalAlignment="Center" />      <TextBlock Canvas.Top="14"        HorizontalAlignment="Center" VerticalAlignment="Top" TextAlignment="Center"        Text="{Binding Attributes[VALUE]}" FontFamily="Arial" FontSize="12">        <Canvas.Left>         <Binding Converter="{StaticResource LeftOffsetter}"           RelativeSource="{x:Static RelativeSource.Self}" Path="ActualWidth" />        </Canvas.Left>      </TextBlock>     </Canvas>    </ControlTemplate> </esri:MarkerSymbol.ControlTemplate> </esri:MarkerSymbol> </Window.Resources> public class CanvasLeftMidpointOffsetter : IValueConverter {    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)    {       // Convert (double) ActualWidth to (double) Canvas.Left       double dActualWidth = (double)value;       return -dActualWidth / 2;    }    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)    {       // Meaningless       return 0;    } } ... View more

I have a local dynamic layer referenced to a file geodatabase.  One of the point feature classes is also accessed by a local feature service.  When I update the feature class through the feature service, it completely stops rendering in the dynamic layer.  But then, if I open the feature class in ArcMap while the WPF app is still running, it immediately starts rendering again! Has anyone else encountered this, and found a solution? UPDATE:  When I use the feature service to drive a separate dynamic layer, that layer refreshes properly when features are updated.  It's not the sort of workaround I'm looking for, but it's a start. ... View more

I created a local, referenced map package that includes a mosaic dataset layer.  It displays at all scales when I open the package in ArcMap, but in Runtime it stops rendering when I zoom in past about 1:60,000: this makes it pretty useless for my application.  I created another map package showing just the mosaic dataset and it behaves the same way.  I also see the same behavior when I add the dataset as a dynamic layer. Any idea why this is happening? ... View more