Latest Contributions by JosephArmbruster

Hey everyone, It's been ages since i've had to resort to the forums, but the time has come...  This is issue is occurring with: 10.3.0.4322 AND 10.5.1.7333 Problem: When a layer is added to the TOC, just as you see in the snippet below, feature selections will no longer be respected (or at least detected) by geoprocessing tools. Description: The symptom of the problem is that obtaining the feature selection count of a geoprocessing layer in a python toolbox is inconsistent.  I've pinned it down to some issue with the way Arc (or ArcPy) is handling layers by Name.  Here are some snippets: # make this an absolute path to some feature class in a geodatabase, you only need a minimum of two features to reproduce the issue, i'm using polygons. path = #path to your polygon feature class with at least two features in it. mxd = arcpy.mapping.MapDocument('CURRENT') new_layer_name = os.path.basename(path) arcpy.MakeFeatureLayer_management(path, new_layer_name) new_layer = arcpy.mapping.Layer(new_layer_name) arcpy.mapping.AddLayer(mxd.activeDataFrame, new_layer_name, 'BOTTOM') del new_layer del mxd Use the code above in a geoprocessing tool to add a layer to the map. Now, use the code below in a separate geoprocessing tool, to report the number of features selected in the map. desc = arcpy.Describe(input_feature_class) if desc.FIDSet:  messages.addMessage('selection made')  # you'll never get here with the layer above!! else:  messages.addMessage('no selection made')  # you'll always get here even with a selection 😞 # count will always be the entire feature class count, since no selection was registered # to the layer.... feature_count = int(arcpy.GetCount_management(input_feature_class).getOutput(0) Notes: - If you use the code above to add the feature class to the map.  Remove it from the toc (right click, remove) and add it using arc catalog (drag-drop), the feature selection will STILL not work.  Hence why I suggest it has something to do with the internal name resolution. - If you start a new ArcMap instance, add the layer by drag-dropping it from Arc Catalog, the selection WILL work.  If you remove this layer and add it using the code above, all subsequent selections will NOT be respected. I look forward to hearing from ESRI support. Let me know if you have any questions, Joseph Armbruster 0Lat Inc, Orlando Florida. [email protected] ... View more