topic Re: How to Add layers with Python in Python Questions

How to Add layers with Python

Angel_ReynaldoCardenas_Huerta — Sun, 19 Aug 2012 16:08:23 GMT

how I do this in python

this is in VBA

Public Sub AddLayer() 'adiciona el layer al map
GetT
'Open Feature Class
Set pWorkFact = New AccessWorkspaceFactory
If sPathBase = "" Then
Exit Sub
Else
Set pFWorkspace = pWorkFact.OpenFromFile(sPathBase, 0)
End If
Set pFeatureClass = pFWorkspace.OpenFeatureClass(sql)
'Create new layer
Set pFeatureLayer = New FeatureLayer
Set pFeatureLayer.FeatureClass = pFeatureClass

pFeatureLayer.Name = FRBROW.ComboBox1.Value & " - " & FRBROW.ComboBox2.Value
'Add layer to map
Set pDoc = ThisDocument
Set pMap = pDoc.FocusMap
Set pActiveView = pMap
pMap.AddLayer pFeatureLayer
pActiveView.Refresh
End Sub

Re: How to Add layers with Python

GraemeBrowning — Sun, 19 Aug 2012 20:43:45 GMT

A good starting point for this is the AddLayer documentation along with the RefreshActiveView documentation.

If you start with those examples, and don't get all the way to a solution, then post your "code so far" to elicit help to finish it off.

- Graeme

Re: How to Add layers with Python

MarcinGasior — Mon, 20 Aug 2012 08:30:25 GMT

Here's an example how to add Feature Class to MXD in Python:
http://forums.arcgis.com/threads/60368-Add-Feature-Class-to-MXD?p=208463&viewfull=1#post208463

Re: How to Add layers with Python

Angel_ReynaldoCardenas_Huerta — Tue, 21 Aug 2012 22:39:16 GMT

thank you very much for your answers Graeme and Marcin , achieve load the feature class to ArcMap, but I had a problem, and it will not let me upload it again because I created entities, which can not be repeated, the code I use is

arcpy.makefeaturelayer_management ("path or featureclass", "alias")

there is another way to do this without my block to add again the same featureclass?

the other inconsistency I had is that I arcgis10 hangs, and the program runs only a short time within ArcMap

a query, how I would spend my VBA code to. NET and then load it as dll or tlb?

thanks in advance

Angel Cardenas

Re: How to Add layers with Python

GraemeBrowning — Tue, 21 Aug 2012 22:54:23 GMT

Don't be afraid to thank us by upvoting our contributions 😉

Without seeing your code and any errors it generates it is hard to be sure what your block may be.

However, I would think that you only need to do MakeFeatureLayer on a particular Feature Class once and then to use SelectLayerByAttributes and SelectLayerByLocation with the selection type set to "CLEAR_SELECTION" in between each issuance to do repeated selections on the same Feature Class via its Feature Layer.

- Graeme

Re: How to Add layers with Python

Angel_ReynaldoCardenas_Huerta — Tue, 21 Aug 2012 23:06:15 GMT

thanks for your prompt reply Graeme, blocking is that I can not add more featureclass again, either by script or by ArcCatalog, the erro is, existing entity ("featureclass alias name")

There is another way to add without my block to add the same again?

thanks in advance

Angel Cardenas