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[TRNSYS-users] numerical solution in new type with C++



Dear fellow TRNSYS users,
I have the following problem. I'm trying to write a new type for TRNSYS in C++, which involves the numerical solution of differential equations. Usually, SetNumericalDerivative is used to set the numerical derivatives and then GetNumericalSolution is used to obtain the solution of the differential equation. However, when trying to compile my code the compiler gives the following error: "error C3861: "getNumericalSolution": Bezeichner wurde nicht gefunden." That is, it can't find the identifier getNumericalSolution. I also tried to instead use the older form and write dtdt[i] = x, instead of SetNumericalDerivative(i,x), but here I got the error message "error C2109: Index erfordert ein Array oder einen Zeigertyp" (that is index requires an array or a pointer). I use the project CPP-Mvs2003, which is included in TRNSYS/Compilers, so it has access to TRNSYS.h and TRNDll.lib, and I also successfully used my setup to generate another custom type, albeit without any numerical solution. So my question is: how can I solve numerical equations with a type written in C++? How do I set the derivatives and how do I access the solutions? Do GetNumericalSolution/SetNumericalDerivative not work with C++ (I didn't find them in TRNSYS.h) and if so, what do I use instead?
Thanks in advance for any pointers!
Cheers,
Iris