"retrieving macro values after running process with Process.run()"

Hello,

i dont know how to retrieve macro values (at the end of the process) after running a process from java code.

Process preprocess = RapidMiner.readProcessFile(new File("/somepreprocessarrangement.rmp"));
IOContainer ioc = preprocess.run();

now from here i was not successful.

i tried to get macro values from here:
preprocess.getMacroHandler()

and from the ProcessContext

without success.

some help would be nice.

thanks,

ud