Latest Contributions by DuncanHornby

‎01-12-2011

bxe6736, Is this your real name? The only thing I spotted with your code snippet is the line: Dim GP As Geoprocessor = New Geoprocessor() I think should be: Dim GP As IGeoprocessor = New Geoprocessor() If this does not fix your problem it would help us if you uploaded the toolbox, does the model have parameters for example as you are supplying none? Duncan

‎01-09-2011

Dale, If I was calling an existing geoprocessing tool in VB then I would use the IGeoProcessor Interface. Search for this in the Help and then may be the forum to see how to set it up and supply the parameters to execute it. Have a look at this thread, the basic syntax is all there. Duncan

‎01-09-2011

Chris, First of all do you have the VBA developer help installed? If you are going to do any coding in VBA this is essential as you can search this or highlight an ArcObjects interface in the VBA editor and press F1 to find out all about it. You'll need the installation DVD to install it. Once you got that going just type IEditor you will see a method called StartEditing and all the others you need. Most Interfaces come with example code and you can see exactly how to start and stop editing in VBA. Duncan

‎12-16-2010

Neil, IHitTest... never knew about this Interface, ArcObjects just keeps on giving! 🙂 Duncan

‎12-15-2010

Orsela, The way I would have done this is use the ISegmentCollection and it's property Segment to loop over the collection of ISegments then use something like IProximityOperator to test if the point intersects the segment. Well that's how I would have done it... Duncan

‎12-15-2010

Harsha, What format is your underlying data stored as? If you've got MM then that should be stuck in a File Geodatabase and compressed. If any of your data is Shapefile make sure you have built spatial indices for them. If your data is multi-part explode it into single part and make sure you have a scale threshold set for layers. If you are opening the MXD at the level of the UK you only want to be displaying the coastline and probably key cities, motorways then the other datasets become visible at their appropriate scale. Duncan

‎12-11-2010

Kalid, This can be achieved by using the "field_CumulateValues.cal" script which is free to download from this website. In fact there are many useful scripts here. Duncan

‎12-09-2010

Joe, Finally! I'm always telling people to RTFM and I practise what I preach but it seems the 9.3 desktop help is not the same as the 9.3 online desktop help. I note it says on that page (despite it saying 9.3 Help) that it has been update for 9.3.1 and there bold as brass is that property Path... There are a load of other properties too I never knew the describe object could do, this is very frustrating. The sooner they give up on python and go back to VBA the better! 😉 Thanks for your help. Duncan

‎12-09-2010

Joe, Sorry to bang on about this but I looked at the Help page you identified, a page I have looked at before but I see NO mention of the property (thanks for correcting me) Path. There is the property CatalogPath which you use on a dataset object but this actually returns something slightly different (with a shapefile). So where did you find out about the property Path? Duncan

‎12-08-2010

Hi, Thats a good way of determining the workspace, but my question is where is the method Path documented in the Desktop help file? I find no mention of this method in the help file or object model! I get your point about placing this question in the other thread but I've always considered that to be about processing not annoying specifics of Python! Thanks for your help. Duncan

‎12-08-2010

Python Gurus, As you all know there is the annoying problem of SQL syntax between different storage formats, by this I mean for a Personal Geodatabase a field is enclosed in [] whilst a file geodatabase has fields enclosed in "". I've recently became aware of a useful method of the geoprocessor AddFieldDelimiters that automates the correct enclosure based upon a workspace requirements. The Object Model diagram shows that the syntax is gp.AddfieldDelimiters(fieldname,workspace). Now I often expose my scripts as tools within ArcToolbox so my input parameters are usually a FeatureLayer. My problem is that having looked at the Object Model I can't work out how one gets a handle on the Workspace of a FeatureLayer which I could then use to feed into the AddfieldDelimiters method for building the correct SQL syntax. I thought the Describe method would help with this but it seems it is not possible. What I want to avoid is the user having to select not only the FeatureLayer but then navigate to it's Workspace in the ArcToolbox interface. So my question is simply how does one get the workspace of a featurelayer using the geoprocessor in Python? I am using ArcGIS 9.3. Duncan

‎12-08-2010

Rory, Take a look at the desktop help file! It has hundreds of examples of how to script the geoprocessing tools in Python. Depending upon exactly what you want to do you may want to merge tables or append data to an existing table? Anyway search the help file for the Merge tool and at the bottom of the page there is always a short example of the tool being called using Python under the section Scripting syntax. Duncan

‎11-30-2010

Greg, Here is the VBA code for loading a table into the map document: Sub test2() ' Get document Dim pMXDocument As IMxDocument Set pMXDocument = ThisDocument ' Get Map Dim pMap As IMap Set pMap = pMXDocument.FocusMap ' Get table collection Dim pStandaloneTableCollection As IStandaloneTableCollection Set pStandaloneTableCollection = pMap ' Create workspacefactory (for opening up dBase files) Dim pWorkspaceFactory As IWorkspaceFactory Set pWorkspaceFactory = New ShapefileWorkspaceFactory Dim pFeatureWorkSpace As IFeatureWorkspace Set pFeatureWorkSpace = pWorkspaceFactory.OpenFromFile("C:\Temp", 0) ' Get dBase table Dim pTable As ITable Set pTable = pFeatureWorkSpace.OpenTable("testtable") ' note no .dbf ' Create StandaloneTable Dim pStandaloneTable As IStandaloneTable Set pStandaloneTable = New StandaloneTable Set pStandaloneTable.Table = pTable pStandaloneTable.Name = "My Table" ' Add table to Map pStandaloneTableCollection.AddStandaloneTable pStandaloneTable pMXDocument.UpdateContents End Sub Duncan

‎11-28-2010

Greg, Here is a simple bit of code in VBA to get you going. Sub test() ' Get document Dim pMXDocument As IMxDocument Set pMXDocument = ThisDocument ' Get Map Dim pMap As IMap Set pMap = pMXDocument.FocusMap ' Get table collection Dim pStandaloneTableCollection As IStandaloneTableCollection Set pStandaloneTableCollection = pMap ' Get a count of tables Dim n As Integer Let n = pStandaloneTableCollection.StandaloneTableCount ' Step through each table and print name Dim pStandaloneTable As IStandaloneTable Dim i As Integer For i = 0 To (n - 1) Set pStandaloneTable = pStandaloneTableCollection.StandaloneTable(i) Debug.Print pStandaloneTable.Name Next i End Sub Duncan

‎11-27-2010

Greg, To add or find a table in the map document you need to be using the IStandaloneTableCollection Interface. You can loop with this to compare names of tables in the collection. There is no "find the table with this name" function you must enumerate the collection. Duncan

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