[VPI] read and write values of register arrays ?

Hi all !

I am wondering how to access (write and read) a register array passed
as parameter to my vpi function.
Here is the resume (dummy) code that I have.

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/* file cosimu.v */

reg [7:0] my_reg_array [0:3][0:3];

initial
$c_random_fill(my_reg_array);


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/* file vpi_func.c */

/* Write value to reg array */
int c_random_fill(char *userdata)
{

/* get handles ... */
vpiHandle
systfref, // handle on current function
args_iter, // handle to iterate on arguments
argh, // handles on arguments
var_name; // handles on variable names

/* structures for input arguments */
struct t_vpi_value argval;

/* Obtain a handle to the argument list */
systfref = vpi_handle(vpiSysTfCall, NULL);

/* get first handle of function args */
args_iter = vpi_iterate(vpiArgument, systfref);

argh = vpi_scan(args_iter);

/* getting iterator on Verilog data to fill */
argval.format = vpiRegArray;

/* How can I continue here to iterate on the register values of
my_reg_array ? */

vpi_printf("\n Thank you ! \n);

return 0;
}