Latest Contributions by MikeHunter

You are making it way too hard on yourself. Let's simplify the code a little:     def onMouseDownMap(self, x, y, button, shift):                 # set up environment         arcpy.env.workspace = "C:/temp/python/test.gdb"         Parcels = "C:/temp/python/test.gdb/Parcels"         mxd = arcpy.mapping.MapDocument("current")         df = mxd.activeDataFrame         # build point geometry, run your getSearchDistanceInches function            pointGeom = arcpy.PointGeometry(arcpy.Point(x, y), mxd.activeDataFrame.spatialReference)         searchdistance = getSearchDistanceInches(df.scale, 3)         # make an arcpy.mapping layer obj and do the selection by location         plyr = arcpy.mapping.Layer(Parcels)         arcpy.SelectLayerByLocation_management(plyr, "INTERSECT", pointGeom, "%d INCHES" % searchdistance, "NEW_SELECTION")         # all done, now add our layer to the map         arcpy.mapping.AddLayer(df, plyr, "BOTTOM")         arcpy.RefreshActiveView() There are 2 kinds of feature layers used in arcpy code. The type made by MakeFeatureLayer_management is a geoprocessing layer and does not work with some parts arcpy.mapping, like AddLayer. The other kind is an arcpy.mapping layer object, which can be a feature layer or a number of other kinds of layers.  If it is feature layer, then it will work with at least some of the geoprocessing tools like SelectLayerByLocation that expect a feature layer. If this seems confusing, don't feel bad. It confuses me too. Here's some more confusing stuff: You can create an arcpy.mapping.Layer object from a saved .lyr file, like you were doing. Now, the documentation doesn't tell you this, but you can also make a layer object from a feature class on a disk, from another layer in the toc, or even from a geoprocessing layer made with MakeFeatureLayer_management.  So all the work you were doing to make a .lyr file was unnecessary.  Just make an arcpy.mapping layer straight from the feature class, select against that layer, and add it to the map. You were raising an error in your code so that's why it seemed nothing was happening. The addin environment is really tough to debug in, since you don't get to see the traceback and usually don't even know an error has occurred.  So I get my code running first by executing it in the Python window. Then, when everything is running correctly, I stick the code into a method or function in the addin. good luck, Mike ... View more

The first argument for arcpy.mapping.AddLayer has to be a DataFrame instance, but you are passing it a string, the name of the dataframe.  You've already hooked to the DataFrame instance in your code, so just change this line: arcpy.mapping.AddLayer(df_Target, new_shplyr, "TOP") to this: arcpy.mapping.AddLayer(dataFrame, new_shplyr, "TOP") I think that will fix you up. good luck Mike ... View more

I'm not really clear on what you are trying to do, but you seem to want a list of the values in the Sum_Count field.  All you have to do is replace your code: rows = arcpy.SearchCursor(featureClass) row = rows.next() while row:         print row.Sum_Count         row = rows.next() with: rows = arcpy.SearchCursor(featureClass) value_lst = [row.Sum_Count for row in rows] Now you'll have a list of the values in the Sum_Count field, and you can do what you want with them later in the code. The error you were getting was raised when you tried to reference the row object after the last next() call, which always returns None when the end-of-file is encountered.  Use a value from the value_lst instead, and that error will go away. good luck, Mike ... View more

To allow overwriting of the featureclass, add this to the top of the script: arcpy.env.overwriteOutput = True And your layer is getting added to the mxd file on the disk, not to the current version that's displayed. Maybe I'm misunderstanding what you want, but if you want the layer added to the current display, then you'll have reference the current mxd: mxd = arcpy.mapping.MapDocument('Current') To keep all the other layers out of a map, do this: arcpy.gp.AddOutputsToMap = False This may or may not help, but hopefully it will get you started in the right direction. Mike ... View more