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combine arcpy.GetMessages with arcpy.AddWarning in cust modules in a Python Toobox

Question asked by washakie on Mar 12, 2013
Latest reply on Mar 12, 2013 by washakie
Hello, I've created a Python Toolbox that imports a function from a custom module to do most the work. So, in my toolbox.pyt file I have:

def execute(self, parameters, messages):     """The source code of the tool."""     import sys     sys.path.append(CUSTOM_PATH)     import pEnki.ENKI_prepinput as ep      ep.prep_input(parameters)

It seems to work, but I am having some problems with messages. In my prep_input function I have the following as one example:

# # Process: Polygon to Raster  for shp, field in selects:      arcpy.AddMessage("trying to create {0} raster".format(field))     try:         res = arcpy.PolygonToRaster_conversion(shp, "FID",                                                 "{0}_{1}.tif".format(RegionName, field),                                                 "CELL_CENTER", "NONE", "1000")         arcpy.AddMessage('Created: {0} raster'.format(field) )     except:         arcpy.AddWarning( arcpy.GetMessages(2) ) 

But this just returns an empty string in the Warning. I've tried some other variants of the above... but so far can't figure out exactly how to pass the message from arcpy.GetMessages(2) (e.g. the reason for the exception) to the arcpy.AddWarning.

Some documentation on how this should be done/achieved would be appreciated.