Hi
This is a repost of a bug from the geant4 forum:
http://hypernews.slac.stanford.edu/HyperNews/geant4/get/userinterface/109.html
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Hello I did a quick search on google and I did not find any postings about this so here it goes...

After seeing Makoto's presentation early this month, I was please to see /control/loop and /control/foreach commands implemented. However I run the following example and I found some unwanted behaviour:

  LINE1: /control/foreach Runtest.mac materialUSR "G4_POLYETHYLENE TNT WetSand5ppc isoN14 Graphite"
  LINE2: /control/foreach Runtest.mac materialUSR "G4_POLYETHYLENE TNT WetSand5ppc isoN14 Graphite " <- NOTE: 'extra spc

Notice the difference btw L1 and L2 is the space at the end of the listing. Notice Runtest.mac is defined as:

  /APIsetup/target/setTargetMat   {materialUSR}
  REMARK: This command is handle by my own DetectorConstruction Messenger class.

When I run L1, I get the following error when running the fifth element of my list (At this point I have four output files: polyEt.root tnt.root wsand5.root n14.root):

  parameter value is not listed in the candidate List.
  ***** Illegal parameter (0) </APIsetup/target/setTargetMat {materialUSR}> *****

Based on experience, I took a guess and I assumed there is a problem with the tokenizer implemented for the UI cmd "/control/foreach". Hence I added an extra space at the end of the listing. It partially solved the problem EXCEPT now I output 6 files instead of the expected 5.

Output files: 
  polyEt.root tnt.root wsand5.root n14.root graphite.root graphite_0001.root

Adding the extra space makes the last item in the list run twice. It would be great to have it fix. i did not trace the source code and I am totally assuming it is not dependent on my platform:

  uname -a
  Linux [xxxxHIDDENxxxxxx] 3.11.10-100.fc18.x86_64 #1 SMP Mon Dec 2 20:28:38 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Regards, Chris 


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Ok so I was able to figure out (sort of) the bug that exist in the /control/foreach command. Here you can see it in my simple example. Run the folloiwng lines:

  /control/alias CM "1"
  /control/foreach ./g4macros/kookoo.mac CM "p pi- mu-"

The macro file kookoo.mac has the following line in it:

  /control/echo {CM}

The output I get is:

  p
  pi-
  mu-"

Here in the output you can see the last element has an extra character referring to the char >>"<<. This causes the command to crash when executing the last element in the list. Please fix this bug!!!! Otherwise the /control/foreach command is not that useful.

Cheers!!!!

C Mos