Latest Contributions by NeilClemmons

It is not possible for a feature to have an ObjectId of -1. ... View more

GetFeature() takes the ObjectId of the feature you want it to return. ... View more

I have Visual Studio 2010 Professional Edition installed and have just loaded the ArcGIS 9.3.1 SDK and do not see any ArcGIS templates.  Do I need to be running Visual Studio 2008 to work with ArcGIS 9.3.1? You can use any version of Visual Studio to program against any version of ArcGIS as long as that version of Visual Studio supports the version of the .NET Framework required by the version of ArcGIS that you're using..  However, the ESRI SDKs are only supported for specific versions of Visual Studio (which versions of Visual Studio depends on which version of the SDK, refer to the developer help).  This means if you are using an unsupported version of Visual Studio then you cannot install the ESRI SDK.  All the SDK is is a collection of templates and addins for Visual Studio.  For me personally, I don't ever use any of those so not having the SDK installed is no big deal. Also, you need to make sure that you're targeting the version of the .NET Framework that is supported by the version of ArcGIS you're programming against.  For 9.3.1, that would be .NET Framework 3.5. ... View more

No, ArcGlobe does not have an Editor extension like ArcMap.  Of course, you can use the IWorkspaceEdit interface to edit any data you have access to. ... View more

Here's a VBA script that will set the background color to red.  You can modify it as needed. Sub SetBackgroundColor()     Dim mxDoc As IMxDocument     Set mxDoc = ThisDocument     Dim map As IMap     Set map = mxDoc.FocusMap     Dim layout As IPageLayout     Set layout = mxDoc.PageLayout     Dim gc As IGraphicsContainer     Set gc = layout     gc.Reset         Dim element As IElement     Set element = gc.Next     Do While Not element Is Nothing         If TypeOf element Is IMapFrame Then             Dim mapFrame As IMapFrame             Set mapFrame = element             If mapFrame.map Is map Then                 Dim background As IBackground                 Set background = mapFrame.background                 Dim symbolBackground As ISymbolBackground                 Set symbolBackground = background                 Dim fillSymbol As IFillSymbol                 Set fillSymbol = symbolBackground.fillSymbol                 Dim color As IRgbColor                 Set color = New RgbColor                 color.Red = 255                 color.Green = 0                 color.Blue = 0                 fillSymbol.color = color                 symbolBackground.fillSymbol = fillSymbol                 mapFrame.background = background                 mxDoc.UpdateContents                 mxDoc.ActiveView.Refresh             End If         End If                 Set element = gc.Next     Loop End Sub ... View more

I have two feature layers. The first one is just a polygon and the other one consists of a series of polygons which are enclosed by the first one. Thus, some polygons of the second feature layer touch on the boundaries of the first feauture layer. So you're saying you have features in one layer that are inside of a feature on another layer?  The definition of "touch" is that the geometries only share a boundary.  If one geometry is inside another then they cannot touch because their interiors intersect. ... View more

Do both geometries have the same spatial reference?  If not, then you should project one geometry into the spatial reference of the other before calling Intersect. ... View more

Yes.  You set the spatial filter's geometry to whatever geometry will select the features you want.  If you want to select features on one layer using the geometries of multiple features from another layer then you need to create a geometry that is the union of those feature geometries.  This can be done using ITopologicalOperator.  The most efficient method would be to use the ConstructUnion method, which requires an IEnumGeometry object.  You can get this from IEnumGeometryBind. ... View more

You set up the Spatial Filter object so that it will select the features that you want to remove.  You pass this Spatial Filter into IFeatureSelection::SelectFeatures().  You also set the Combination Method parameter to Subtract. ... View more

You use the interface when checking types with TypeOf.  Keep in mind that a symbol can be many different types.  If you look at the help for ISymbol then you'll see a list of all the coclasses that implement that interface.  In theory, it could be any of them but you can rule some of them out simply because it's a symbol being used by a line layer.  That's why I suggested only testing for the ILineSymbol types.  If you look at the help for ILineSymbol then you'll see the list of coclasses that you should be checking for. ... View more

You do it the same way you're checking for the renderer type in your code, by using TypeOf.  The symbol for a polyline layer will be of type ILineSymbol.  There are several coclasses that implement ILineSymbol  - MarkerLineSymbol and SimpleLineSymbol are only two of them so you'll need to check for all of the others as well. Dim lineSymbol As ILineSymbol = simpleRenderer.Symbol If TypeOf lineSymbol Is IMarkerLineSymbol Then   ' marker line symbol ElseIf TypeOf lineSymbol Is ISimpleLineSymbol Then   ' simple line symbol End If ... View more

Thanks Neil, To be honest I think the help on the subject is really poor, so I often have a hard time figuring out if my strings are correct in the first place. Cheers That's the problem I've had when trying to use it.  One thing you might try is to use IFeatureSelection to select the points you want.  Call SelectFeatures once to select all features then call it again to subtract the points inside the polygon.  It will be slower than using a single query but it should work. ... View more

Do the search geometry and the featureclass have the same spatial reference?  If not, you'll need to project the search geometry into the same spatial reference as the featureclass you're searching.  Alternately, you can set the OutputSpatialReference property on the spatial filter object.  Trying to set the description string can be confusing and there have been bugs found in the past, so you may ultimately have to log an incident with ESRI to get to the bottom of it. ... View more

Get a reference to the renderer from IGeoFeatureLayer::Renderer.  QI to the correct renderer type (IUniqueValueRenderer, IClassBreaksRenderer).  Then all you have to do is create the color objects you want and set the symbol properties on the renderer.  The way you access the symbols depends on what type of renderer it is.  That information is all in the developer help. ... View more