Latest Contributions by JamesCrandall

Sorry, forgot to show you where the point is appearing. See attached. I see what you mean! In that case, let's take Alexander's advice and use the LabelPoint of the pArea.  Change this: pPoint = pArea.Centroid To this: pPoint = pArea.LabelPoint ... View more

I am not sure why you are seeing centroids outside of any selected polygons --- it really isn't the centroid of the polygon then, right?  Not sure what you have going on there.  I did some limited testing of the code below and it places graphic points at the centroid locations of each of the selected polygons, or at least what appears to be the centroid.  None are placed outside of any selected polygon.             Dim pGraphics As IGraphicsContainer             pGraphics = pMap             Dim pMarkerElem As IMarkerElement             pMarkerElem = New MarkerElement             Dim pElement As IElement             pElement = pMarkerElem             Dim pFCursor As IFeatureCursor             Dim pSelectionSet As ISelectionSet             Dim pFSelection As IFeatureSelection             pFSelection = pMap.Layer(0)             pSelectionSet = pFSelection.SelectionSet             ''set the pfeaturecursor             pFCursor = Nothing             ''Get a cursor from the selected features             pSelectionSet.Search(Nothing, False, pFCursor)             Dim pPoly As IPolygon             Dim pArea As IArea             Dim pPoint As IPoint             Dim pFeat As IFeature             pFeat = pFCursor.NextFeature             Do Until pFeat Is Nothing                 pPoly = pFeat.ShapeCopy                 pArea = pPoly                 pPoint = pArea.Centroid                 pElement = New MarkerElement                 pElement.Geometry = pPoint                 pGraphics.AddElement(pElement, 0)                 pFeat = pFCursor.NextFeature             Loop             pDoc.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, Nothing, Nothing)             pDoc.ActiveView.Refresh() ... View more

Hi, I'm C# programmer and have some knowledge about working with ArcGIS Desktop 10. But I'm new at ArcObjects in C#. Can somebody give me an example, how I can add a new layer to existing MXD map in C# from XY table? Examples which I found before didn't work. Can I do this from dataset or we need to generate some extra files like TXT or XLS? Thank you When you say "dataset", do you mean x/y values in an ADO.NET DataSet/DataTable? ... View more

The feature class is a personal geodatabase featureclass, I'm not dealing with SDE featureclasses so unfortunately your second post doesn't apply, but thanks for looking into this. But from your original post you say that this occurs with SDE FeatureClasses... [INDENT]"...I've noticed users finding this occurring with SDE databases but not with PGDBs - has anyone experienced this?"[/INDENT] I wonder if the issue is that because you have a large number of layers in the TOC that something isn't slipping by you that you think is something else (like an SDE FC or something and is the one that is causing problems).  In which case you might want to check/verify the type prior to checking it's path.  The help has an example: Public Function GetPathForALayer(ByVal layer As ESRI.ArcGIS.Carto.ILayer) As System.String If layer Is Nothing OrElse Not (TypeOf layer Is ESRI.ArcGIS.Geodatabase.IDataset) Then   Return Nothing End If Dim dataset As ESRI.ArcGIS.Geodatabase.IDataset = CType(layer, ESRI.ArcGIS.Geodatabase.IDataset) ' Explicit Cast Return (dataset.Workspace.PathName & "\" & dataset.Name) End Function http://help.arcgis.com/en/sdk/10.0/arcobjects_net/componenthelp/index.html#/Get_Path_for_a_Layer_Snippet/004900000092000000/ ... View more

There's lots of resorces on the ArcGIS Resources pages dedicated to ArcGIS Engine application development.  Looks like .NET (VB, C#, etc..), C++ and Java are the choices in programming languages: http://resources.arcgis.com/content/arcgis-engine/10.0/about ... View more

Also, am I getting eastings and northings or latitude and longitude here? Thanks again for your generous help. You are probably not going to like hearing this, but its not quite that simple.  You are getting the x/y of the point's spatial reference (I have no way of knowing what that is, it is your point layer).  To make sure you are getting the Lat/Lon, you will have to make sure the point has a geographic coordinate system assigned and in order to do this I think you will have to project it from something. ...In essence, you will need to know where you are coming from in order to get it to project to something. Luckily the old forums are full of examples.  You might start here: http://forums.esri.com/Thread.asp?c=93&f=993&t=227713&mc=1#msgid691091 Found with these search terms: IPoint.X ... View more

If your Command/Tool does not have any registration code and you are manually "Add From File" via the Customize dialog, then try to add the type library (.tbl) file instead of the .dll file. http://help.arcgis.com/en/sdk/10.0/arcobjects_net/conceptualhelp/index.html#//00010000040v000000 ... View more

Also, after looking at some older posts I noticed for VBA that pDoc should be set to "ThisDocument" instead of how the OP has it: Set pDoc = Application.Document Should this be: Set pDoc = ThisDocument Sorry it's been a long time since I've used VBA and just trying to help out as best I can! ... View more

Also, you have specified the lat and lon variables as LONG data type.  Why?  This would produce a whole number, which I don't know of any Latitude/Longitude coordinate that is a whole number.  Is that what you want? ... View more

The pSelectionSet.Search(Nothing, False, pFCursor) is appearing in red. I am guessing it should be: pFCursor = Nothing pFCursor = pSelectionSet.Search(Nothing, False, pFCursor) No the way you have the pFCursor would not work --- the code I posted works just fine for me.  I really don't know why it would appear in red or do I even know what that means.  I am using Visual Studio 2008 with all of the proper SDK's installed, along with ArcGIS v10. ... View more

But now I am getting a run-time error: Run-time error:91 Object Variable or With Block Variable not set When I click on debug, it takes me to the following line in code: Set pFeat = pFCursor.NextFeature Thanks again. That's probably because you are not setting pFCursor anywhere (I don't think I provided that in my original post.  sorry I am picking snippets from my own implementation which is different).  See if this helps/completes the code.  Sub CreateCentroid() Dim pDoc As IMxDocument Dim pMap As IMap Set pDoc = Application.Document Set pMap = pDoc.FocusMap Dim pFCursor As IFeatureCursor Dim pSelectionSet As ISelectionSet Dim pFSelection As IFeatureSelection Set pFSelection = pMap.Layer(0) pSelectionSet = pFSelection.SelectionSet ''set the pfeaturecursor pFCursor = Nothing ''Get a cursor from the selected features pSelectionSet.Search(Nothing, False, pFCursor) Dim pPoly As IPolygon Dim pArea As IArea Dim pPoint As IPoint Dim lat As Long Dim lon As Long Dim pFeat As IFeature Set pFeat = pFCursor.NextFeature Do Until pFeat Is Nothing     Set pPoly = pFeat.ShapeCopy     Set pArea = pPoly     Set pPoint = pArea.Centroid     lat = pPoint.X     lon = pPoint.Y     Set pFeat = pFCursor.NextFeature Loop End Sub ... View more

First, are you declaring pDoc and pMap somewhere else? Dim pDoc As IMxDocument Dim pMap As IMap If not, you will need to put these at the top of your CreateCentroid Sub or make them Private variables in the entire class. It has been a long time since working with VBA, but I don't think this will work: pDoc = m_pApp.Document Try to replace it with: Dim pDoc As IMxDocument pDoc = Application.Document ... View more

I think I need ArcGIS Visual Studio Integration Framework! Is there any other way I can acheive this? i.e. build a custom tool based on a model? Just fyi, from: http://edndoc.esri.com/arcobjects/9.2/NET/73516929-d390-456c-84bc-c8f8a58b645a.htm "...The ArcGIS Visual Studio IDE Integration Framework is installed as part of the Software Developer Kit (SDK) for .NET for each ArcGIS product and is an optional feature during installation. This framework is available for Visual Studio 2005, Visual Basic 2005 Express, Visual C# 2005 Express, and Visual Web Developer 2005 Express editions." So, I am not certain if the VS IDE Framework is what you need.  I do believe that the reason why no ArcGIS Project templates show up is because you simply do not have the ArcGIS .NET SDK installed. ... View more

James, I am trying to create an Add-In following this link: http://help.arcgis.com/en/sdk/10.0/arcobjects_net/conceptualhelp/index.html#//0001000001ms000000 But I cannot find ArcGIS node under project type. What do I need to do in order to get that in Visual Studio? I apologise for these questions as I am a bit of a beginner in Arc. I will be adding this to ArcMap and hopefully, once it is up and running, my colleagues will be using it too. Thanks. I *think* this is because you do not have the ArcGIS .NET SDK ("Developer Kit") installed.  Can someone else confirm this? ... View more

Not sure if there is a forum specific to Python, but if you are going to write something similar to VBA, you'd probably want either create an Add-In or a COM implementation (I assume this is for extending ArcMap?) In any event, here is some code that would get the centroid (and lat/lon values of that centroid) of a selected polygon feature for the first layer in the TOC.  pDoc = m_pApp.Document pMap = pDoc.FocusMap ''get the selection from the layer Dim pFCursor As IFeatureCursor Dim pSelectionSet As ISelectionSet Dim pFSelection As IFeatureSelection pFSelection = pMap.Layer(0) Dim pPoly As IPolygon Dim pArea As IArea Dim pPoint As IPoint Dim lat As Decimal 'not sure exactly which number format you'd want to use Dim lon As Decimal Dim pFeat As IFeature = pFCursor.NextFeature Do Until pFeat Is Nothing     pPoly = pFeat.ShapeCopy     pArea = pPoly     pPoint = pArea.Centroid     lat = pPoint.X     lon = pPoint.Y     pFeat = pFCursor.NextFeature Loop this may be a kind of round-about way to get at things, but it does seem to work. ... View more