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Keywords: ASCII
Forum: (Graphical) User Interfaces
Re: None How to create ASCII output? (Anil)
Re: None Re: How to create ASCII output? (John Allison)
Re: None Re: How to create ASCII output? (David Oxley)
Date: 16 Dec, 2007
From: John Allison <John Allison>

Right! OK!

These issues are more to do with C++ and object oriented programming than with Geant4.

Creating an analysis manager is a way of being object oriented. In any function you can (using A01 as an example)

  A01AnalysisManager* am = A01AnalysisManager::GetInstance();

So it's then up to you to write methods (functions) of the analysis manager or give access to data of the analysis manager that you want.

If you want to avoid the overheads of all this, C and C++ allows you to define a global object, say, myfile:

  #include <fstream>
  using namespace std;
  ofstream myfile("myfilename");

at the top before any functions, methods, etc., and use it

  myfile << whatever << endl;

anywhere. If you want to write to the same file with code that is in more than one C++ source file, put the above in one file, where the first output will come from, and

  #include <fstream>
  using namespace std;
  extern ofstream myfile;

in every other source file. This is allowed in C and C++, but it's generally thought to be bad practice to have global objects (you might get a confusion of names).

Another point is: one usually wants to postpone the decision about writing until the end of the event. I typically put stuff, e.g., energy deposited in each step, in containers in the analysis manager, then in EndOfEventAction write it all out if the event passes some selection criterion. If you really want to do this the proper way you should create hits (see examples/novice/N03 and following) and dump them to file in EndOfEventAction if you want, or even more professionaly, use Geant4 persistency classes. Hits have the advantage they can be viewed if you write a Draw method.

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1 None: Re: How to create ASCII output?   (David Oxley - 17 Dec, 2007)
(_ None: Re: How to create ASCII output?   (Anil - 02 Feb, 2008)
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