Function pointer as the parameter

I followed the NAG example for optimation. The main function is:

void nag_opt_nlp(int n, int nclin, int ncnlin, double a[], int tda, double bl[], double bu[],
void (*objfun)(int n, double x[], double *objf, double g[], Nag_comm * comm),
void(*confun)(int n, int ncnlin, int needc[], double x[], double conf[], double conjac[], Nag_Comm *comm),
double x[], double *objf, double g[],
Nag_E04_Opt *options, Nag_Comm *comm, NagError *fail)

In the manual example, the call of the objective function 'objfun' is directly objfun, yet my compiler returns an error of:

error of parameter 8: can't convert void(int,double [],double *,double [], Nag_comm*) to void(_stdcall *)(int*, double*, double*,double*,Nag_comm*)

I really have no idea how to tackle this. Anyone can help? Many thanks!

Dunno - your error message and code are inconsistent.

> void (*objfun)(int n, double x[], double *objf, double g[], Nag_comm * comm)
First parameter is an int in the function pointer declaration in the prototype of nag_opt_nlp

> can't convert void(int,double [],double *,double [], Nag_comm*)
What you appeared to try and pass as a parameter matches that.

> void(_stdcall *)(int*, double*, double*,double*,Nag_comm*)
What it claimed it wanted doesn't match.
The first parameter is int*, not int

Sorry! Just a typeout error. It is int.

error C2664: cannot convert parameter 8 from 'void (int, double [], double *, double [], struct comm_struct *)' to
'void (_stdcall *)(long, double *,double*,double *, struct comm_struct *)'

> Sorry! Just a typeout error. It is int.
Well don't make typo's then!
Copy/paste what you can actually see.

Well there's the answer then - one param is int, the other is long.

Make them consistent.