Latest Contributions by DuncanHornby

Michelle, Can you upload your toolbox that you have linked your python script to so we can check the parameters. Also give us an example of the sql expression you are adding and maybe a sample of your data (in the format that it is stored as)? Duncan ... View more

Aleydis, I use PyScripter as my Python development environment. I find running a script from the Python command line window in ArcMap slower than running it from the IDE environment.  Also if you have a multicore processor maybe you could try and utilise them all? There is a great blog article showing a simple example here. Duncan ... View more

Ivan, This code gets to the width and height of a graphic: Public Sub test()         ' Get the map and the graphics container for it     Dim pMap As IMap     Dim pMXDocument As IMxDocument     Set pMXDocument = ThisDocument     Set pMap = pMXDocument.FocusMap     Dim pGraphicsContainer As IGraphicsContainer     Set pGraphicsContainer = pMap         ' Get the first element     Dim pElement As IElement     pGraphicsContainer.Reset     Set pElement = pGraphicsContainer.Next         ' Get the name property and display     Dim pElementProperties As IElementProperties     Set pElementProperties = pElement     MsgBox pElementProperties.Name         ' Get the width and height and display     Dim pEnvelope As IEnvelope     Set pEnvelope = New Envelope     Dim pDisplay As IDisplay     Set pDisplay = pMXDocument.ActiveView.ScreenDisplay     pElement.QueryBounds pDisplay, pEnvelope     MsgBox CStr(pEnvelope.Width), vbInformation, "width"     MsgBox CStr(pEnvelope.Height), vbInformation, "height" End Sub Another Interface is IBoundsProperties. This code worked well for a circle but I noticed that when I drew a polyline graphic it's width was different to what the dialog was reporting, not sure why. Duncan ... View more

Are you saying the ArcToolbox contains no tools, so the whole window is blank?  I used to get this problem in 9.3 and found that the only way to make them come back is to add the system tools. In ArcGIS 10 you would open ArcToolbox, right click anywhere in it and select add toolbox. In the look in drop down select toolboxes then go into system toolboxes and select everything. Duncan ... View more

Joe, Try using the Collect value tool. In your model attach the point_ge.shp output of the iterator to a collect value tool. In model builder go to to menu option insert > model only tools > collect values.  This as the name suggests collects the values generated by the iterator which can then feed into the append tool. Duncan ... View more

Are you saying when you use the append tool by itself then all the attributes are passed over rather than getting set to zero? May be it's just coincident that you have selected a bunch of shape files that have the same fields and it works? ... View more

Is your polyline data in meter units (for example UTM) but your DataFrame is in lat/long, or vice versa? ... View more

Ann, I downloaded you data and ran the buffer tool using your parameters on all the point layers and they all ran without problem. This suggests to me there is someting weird going on with your output location. Try creating a blank geodatabase and create the buffers in that, so don't use the C:\ESRIPress\GIST1\MyExercises\Chapter9\Tutorial9.gdb Also start with a fresh session of arcmap with just that one point layer loaded to avoid any spatial reference issues. Duncan ... View more

I agree. The code gallery is horrible and just does no work. I find the whole categorising of Products, user community, functions and solution products totally baffling. For example say I want to find a tool that someone may have posted up that works out stream order, which section do I look under? It's a hydrological question I want answered but then it's a network tracing problem, which is sort of a geo-processing problem, but I don't run to run it in Python... How am I to second guess what group the tool has been placed under? In Arcscripts you have 1 entry point you could filter by language and voila it finds stuff. In my opinion this is a classic example of new is not always better, ESRI should reinstate ArcScripts. ... View more

Etienne, The IProximityOperator Interface has a method called ReturnNearestPoint.  You would get a handle on your 2 lines and use this method in both directions to build an ILine geometry from the 2 points? Duncan ... View more

Tim, I don't program in c# so when I looked at your code I noticed something that I would not do. So this could be a red herring and may be what you are doing is simply slicker than how I program? Anyway the line that I thought unusual was: while ((feature = cursor.NextFeature()) != null) I don't know if this is a preference thing but I would have done (in VB): pFeature = pCursor.NextFeature do while not pFeature is nothing counter = counter +1 pFeature = pCursor.NextFeature loop So the retrieving of the feature that you are testing is done in the loop and not on the line that is evaluating if it is nothing. Duncan ... View more

Tony, Exporting the model to a script does show the field mapping parameter. But I agree it's not clear how you would construct that string in a programmatic way. Looking at the Help file it talks about a fieldmappings object being a collection of fieldmap objects but nothing seems to show that long string that the tool builds. Maybe a simpler alternative is to use a Make FeatureLayer tool to turn on/off fields and then the Copy Features tool? Duncan ... View more

Tony, A very simple way to work out how to set up your field map is: Start Arcmap and load your table and layer In Arcmap join your table to your layer Start a new blank model Drop a FeatureClassToFeatureClass tool on your model Open this tool and complete it setting all the options (this includes your field mapping) Export the model to a Python script from the Model > Export menu option Open that script and discover the syntax of the tool which is using your data! Duncan ... View more

I think you need to reset the second feature cursor with each loop of your first feature cursor.  You code should look like: Dim pFCursor As IFeatureCursor Set pFCursor = pFeatureClass.Search(Nothing, True) Dim pFCursor2 As IFeatureCursor Dim pFeature As IFeature Dim pFeature2 As IFeature Dim pPointA As IPoint Dim pPointB As IPoint Set pFeature = pFCursor.NextFeature Do Until pFeature Is Nothing     Set pPointA = pFeature.Shape     MsgBox pFeature.Value(intPosFID) & "F1"     Set pFCursor2 = pFeatureClass.Search(Nothing, True)     Set pFeature2 = pFCursor2.NextFeature     Do Until pFeature2 Is Nothing         Set pPointB = pFeature2.Shape         MsgBox pFeature2.Value(intPosFID) & "F2"         Set pFeature2 = pFCursor2.NextFeature     Loop     Set pFeature = pFCursor.NextFeature Loop Duncan p.s. Please place your code samples inside the code tags (the # symbol on the toolbar) ... View more

Josh, In 9.3 the sequence would be to listen out for the onCreateFeature event in the IEditorEvents Interface. This gives you a handle on the the feature you just drew and through this you can gain access to the attributes of the feature which you update. If you are using Domains on fields then you'll want to  access and read those values into your combobox on your form, check out the IDomain Interface. If you are using 10 it maybe different as Templates now exist, not sure how they complicate things. Duncan ... View more