No function parameter informatio​n when calling Borland C++ DLL

Question

I have a DLL that I've created in Borland C++ 5.5 with the following code:
extern "C"
    void __declspec(dllexport) __stdcall myfun(int * a){*a = - *a; }
Now when I add this DLL using the C/C++ adapter to my sequence and call myfun(), I get the following message: "This function does not have parameter information in the DLL or uses types not recognized by TestStand."
I have also tried creating a similar DLL in MS VC++ but it worked fine. Unfortunately, I have to use Borland C++ because of some legacy code. I don't really know too much about the specifics of how MS VC++ creates DLLs vs Borland but I'd like to figure out how to create a DLL in Borland so that I don't get the error message anymore.

Answer 1

TestStand gets prototype info from visual studio dlls from the decorated name in the export table. extern "C" however generates an export without the C++ decorated name prototype information. So I'd recommend removing the 'extern "C"' and see if it works. If Borland generates visual C++ compatible decorated names then it should work.
Additionally, or if that does not work. You can create a type library in your dll that teststand can use to get the prototype information, however that would be more work and I'm not sure exactly how to do that with Borland C++.
-Doug