call fmincon from vc6.0 where the objf and constraints vary from arguments

I use mcc to compiler fmincon to

myfmincon(int nargout, mwArray& x, mwArray& fval, mwArray& exitflag, const mwArray& myfun, const mwArray& xx0, const mwArray& A, const mwArray& B, const mwArray& Aeq, const mwArray& Beq, const mwArray& LB, const mwArray& UB, const mwArray& mycon);

Now i have myfun and mycon defined in vc6.0 and they have different expressions varying from the input,someone like following:

double myfun(double x[])               
{
    double f = 0;                      
    int N = 100;                           
    for(int i=0; i < N; i++)  
     f = f+x[i]*x[N-i];      
    return f;
}      
double mycon(double x[], double y[])
{
  ...
  return...
}

So, how i can use fmincon in this situation, someone have any ideas? Thanks very much!

Edit [30 Jul 2012, 14:24 BST - OK] Embedded info from answer

in the function fmincon, myfun and mycon are function handles, so how can i define variables in c++ to pass to fmincon(dll)?

[Oleg Komarov]

For reference on how to properly format your question, especially the code: http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

[lin he]

Thanks very much, i will read it carefully and format my questions later