Python called from batch file --> geoprocessing logs

Hi all,

I am calling a number of Python scripts from a batch file like below (simplified)
and would like to benefit from the geoprocessing logging capabilities so that all messages written by arcpy.AddMessage() in the python scripts can be viewed later on from the ArcCatalog Geoprocessing > Results window.

I have added the following statements in the beginning of my Python scripts
arcpy.SetLogHistory(True)
arcpy.gp.logHistory = True

but that doesn't seem to have any effect.
Is the only way to save the geocompressing logging if you execute the scripts actually from a tool within the ArcCatalog environment?

Thanks for any suggestions,
Joep