Originally posted by: Rahimeh

Hello everyone,
I have a strange problem with ILOG Concert in C++;
When I set

ofstream myLog(_strOutFile.c_str());
        m_env.setOut(myLog);
        m_env.setWarning(myLog);
        m_env.setError(myLog);

The output still appears on standard output, i.e. screen.
AT some point I was able to re-direct the output by doing

m_cplex.setOut(myLog);
        m_cplex.setWarning(myLog);
        m_cplex.setError(myLog);

for cplex object but it is also no longer possible.

Any comment?
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

Does none of your output get redirected or is only part of it redirected?
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#DecisionOptimization

Originally posted by: Rahimeh

no part of output is re-directed.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

Hm, this code works well for me:

#include <iostream>
#include <fstream>
#include <ilcplex/ilocplex.h>
 
int
main(int argc, char **argv)
{
   try {
      for (int i = 1; i < argc; ++i) {
         IloEnv env;
         IloModel model(env);
         IloCplex cplex(model);
 
         std::ofstream log("/dev/null");
         cplex.setOut(log);
         cplex.setWarning(log);
         cplex.setError(log);
 
         cplex.importModel(model, argv[i]);
         cplex.solve();
 
         std::cout << "Optimal solution: " << cplex.getObjValue() << std::endl;
 
         env.end();
      }
   } catch (std::exception& e) {
      std::cerr << "std::exception: " << e.what() << std::endl;
   } catch (IloException& e) {
      std::cerr << "IloException: " << e << std::endl;
   }
 
   return 0;
}

It solves all models given on the command line without any output from CPLEX.
Does your code look the same? What CPLEX version do you use?
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#DecisionOptimization

Originally posted by: SystemAdmin

The same for me.
I when I change the environment stream it does not work but when I change the cplex stream it SOMETIMES works and sometimes says gives an error that in debug mode goes to some where in system files that says stream size is problematic.
This snippet is the same as at least what I do and does not work on my machine.
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#DecisionOptimization

Originally posted by: SystemAdmin

IloEnv and IloCplex both have their own pointers/references to output streams.
If you instantiate IloCplex in one of the following ways

IloCplex cplex(env);
IloCplex cplex(model);

then the stream pointers in 'cplex' are initialized from the stream pointers in 'env' or the environment on which 'model' was built.
However, subsequent changes to the streams in these environments do not affect the streams stored for 'cplex'.
This means you must either redirect the streams in the environments before you instantiate IloCplex or change the streams of the IloCplex instance explicitly.

The errors concerning stream size are probably not related to CPLEX. What streams do you use when you encounter these errors?
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#DecisionOptimization

Originally posted by: SystemAdmin

this idea of setting the stream for the environment before instantiating the cplex object seems working BUT still there are cases where setting stream for cplex in the course of algorithm fails. seems something to do with the size of stream.

stream is a simply a text file for me.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: Rahimeh

Thanks for the comment, it worked.
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#DecisionOptimization