C/C++ :: Converting Matlab Struct To Mex

I have a struct that I'm writing in C and need to use a mex function to use it in matlab. The struct was originally in matlab and need to have the variables:

force = feval(forcing, Euler, Euler.x(:,k));
q = squeeze(q(:,k,:)/>/>);
q0 = squeeze(Euler.q0(:,k,:)/>/>);
nx = Euler.nx(:,k);% normal vector
J = Euler.J(1,k);
rx = Euler.rx(1,k);
qh = reshape(qh(k:k+1,:)/>/>,[],1);
k = k;

The mex function I have come up with is:

#include "mex.h"
/* Extract local info for element k */
/* local struct */
typedef struct {
double force;
double q;

[Code] ....