[TRNSYS-users] Problem with static object in user-dll

[Henk Stijnen]

Hi all,

I've created a user component and the corresponding C++ dll. At the start of the simulation an object TSA is to be created. This object is to be used in the simulation steps, and to be deleted at the end of the simulation.

Roughly I did it as follows:

//    ADD DECLARATIONS AND DEFINITIONS FOR THE USER-VARIABLES HERE
     static TSA *tsa;    // TSA DECLARED STATIC

//    SET THE VERSION INFORMATION FOR TRNSYS
      if (info[6]== -2)
    {
               info[11]=16;
     // add additional initialisation code here, if any

           tsa = new TSA();         // TSA CREATED IN THE VERY BEGIN
           return 1;
    }

//    DO ALL THE VERY LAST CALL OF THE SIMULATION MANIPULATIONS HERE
      if (info[7]== -1)  {
         if(tsa) {
            delete tsa;       // TSA TO BE DELETED AT THE VERY LAST CALL
            tsa = NULL;
         }
         return 1;
      }

//    DO ALL OF THE INITIAL TIMESTEP MANIPULATIONS HERE - THERE ARE NO ITERATIONS AT THE INTIAL TIME
      if (time < (getSimulationStartTime() + getSimulationTimeStep()/2.0))
       {
       // AT THIS POINT TSA STILL EXISTS
          tsa->SetOntw(kValue, Area, DesFlowRatePrim, DesTinPrim, DesDeltaPPrim, DesFlowRateSec, DesTinSec, DesDeltaPSec);
          tsa->Bereken();
//          tempOutPrim
                        xout2 = tsa->TuPri;
                        xout[2]=xout2;
            etc....
         return 1;
      }

//-----------------------------------------------------------------------------------------------------------------------
//    *** ITS AN ITERATIVE CALL TO THIS COMPONENT ***
       // AT THIS POINT TSA IS LOST !?!?!?!
       tsa->SetOntw(kValue, Area, DesFlowRatePrim, DesTinPrim, DesDeltaPPrim, DesFlowRateSec, DesTinSec, DesDeltaPSec);
       tsa->Bereken();
//    SET THE OUTPUTS FROM THIS MODEL IN SEQUENTIAL ORDER AND GET OUT
//                      tempOutPrim
                        xout2 = tsa->TuPri;
                                   xout[2]=xout2;
                   etc......

//-----------------------------------------------------------------------------------------------------------------------
//    EVERYTHING IS DONE - RETURN FROM THIS SUBROUTINE AND MOVE ON
      return 1;
      }


As you see TSA is declared static and initialized. At the initial timestep TSA still exists, but in the first iterative call TSA appears to be lost!

Any idea what to do?

Thanks for help or suggestions.

Regards
Henk
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