WebUtil_c_Api problem

Question

I´m trying to execute the following C function:
extern "C" __declspec( dllexport ) int add(int* value1, int* value2);
So I have make the folling package:
PACKAGE BODY calculator IS
     add_func webutil_c_api.FunctionHandle;
     add_func_parameters webutil_c_api.ParameterList;
     add_param1 webutil_c_api.ParameterHandle;
     add_param2 webutil_c_api.ParameterHandle;
     add_return PLS_INTEGER;     
     FUNCTION i_dll_add(add_func IN webutil_c_api.FunctionHandle, value1 IN OUT NOCOPY PLS_INTEGER,
               value2 IN OUT NOCOPY PLS_INTEGER)
               RETURN PLS_INTEGER;
     PRAGMA INTERFACE (c, i_dll_add, 11265);
     FUNCTION dll_add (value1 IN OUT NOCOPY PLS_INTEGER, value2 IN OUT NOCOPY PLS_INTEGER)
          RETURN PLS_INTEGER IS
          BEGIN
               RETURN i_dll_add(add_func, value1, value2);
END dll_add;
          add_func := webutil_c_api.register_function('Calculator_ws.dll', 'add');
          add_func_parameters := webutil_c_api.create_parameter_list;           
          add_param1 := webutil_c_api.add_parameter(add_func_parameters, webutil_c_api.C_INT_PTR, webutil_c_api.PARAM_INOUT, 0);
          add_param2 := webutil_c_api.add_parameter(add_func_parameters, webutil_c_api.C_INT_PTR, webutil_c_api.PARAM_INOUT, 1);
          add_return := webutil_c_api.Invoke_Int('Calculator_ws.dll', 'add', add_func_parameters);           
          webutil_c_api.Destroy_Parameter_List(add_func_parameters);
          webutil_c_api.Deregister_Function(add_func);           
END calculator;
But when I execute the FUNCTION it doesn't work. Does anyone which could be the problem?
Thank you.

Answer 1

Look again at your code - It seems to me this has been converted from some ORA_FFI code am I correct??
If you are calling the dll_add function then this is in turn calling i_dll_add, and that is calling to a DLL loaded on the server side (that's the pragma interface bit) and not touching WebUtil or the client side at all.
So rip out the i_dll_add spec and body and move all the webutil code calls into dll_add where they will actually be called.