I'm sharing this code which is a demo of how to manipulate a
SystemVerilog Unpacked Array using DPI. This code will work with
IUS5.83.

-----file top.v--------
module top ();

`define ARRAY_LO 4
`define ARRAY_HI 13
int xyz[`ARRAY_HI: `ARRAY_LO]  

// define import function to pass reference to 
// open array of int's.  This makes the call generic for
// any array size.
import "DPI-C" context function void doArray(inout int abc[] );

initial
begin
 // stuff the packed structure with data
   for (int i = `ARRAY_LO; i<= `ARRAY_HI ; i++)
     xyz[i] = i + 32'h7777_5555 ;  // fill up the array

  doArray( xyz );  // call dpi function, pass array formal name
   
  // allow the above dpi call to modify array contents, now print it out
  for (int i = `ARRAY_LO; i<= `ARRAY_HI ; i++)
   $display("Vlog: %d %x",i, xyz[i] );

end

endmodule

---file mydpi.c----------
#include <stdio.h>
#include <svdpi.h>
 
// Created by Todd Mackett (tmackett@cadence.com) with some help from
// Abhishek Raheja

void doArray(const svOpenArrayHandle x ) {   // pass in open handle
  io_printf("Array Handle is %x \n", x);
  io_printf("Array Pointer is %x \n", svGetArrayPtr(x) );
  io_printf("Array Left %d, Array Right %d \n", svLeft(x,1), svRight(x, 1) );
  io_printf("Array Low %d, Array High %d \n", svLow(x,1), svHigh(x, 1) );
  //io_printf("Length %d \n", svLength(x,1) ); // not implemented 6.02v138 
  // io_printf("%d \n", svDimensions(x ));  // not implemented 6.02v138

  io_printf("Size of Array in bytes %d \n", svSizeOfArray(x)  );  // returns bytes

  // Print out 1Darray contents using Array Low to High indexes
  int i;
  for (i= svLow(x,1); i <= svHigh(x,1); i++) {
  io_printf("DPI: %d is: %x \n", i,  *(int*)svGetArrElemPtr1(x, i) );
  }

  int *p;
  p = (int*)svGetArrayPtr(x);

  // the Array Index is normalized from 0 (not Vlog array index)
  //   at this point
  for (i= 0; i <= (svHigh(x,1) - svLow(x,1)); i++) {
    p[i] = 0x22221111 + i;
    io_printf("DPI2: %d %x\n", i, p[i]);
     } 
}

-----file RUN_NC (script)----
rm *.so
rm *.log
rm *.h

# Create .h file for Exported tasks/functions only 
# (imported function do NOT need .h file):
ncverilog +sv top.v +ncdpiheader+dpi.h +elaborate +ncelabargs+-messages

# ncvlog -sv top.v -mess
# ncelab top -sv  -dpiheader dpi.h -mess

gcc -fPIC -shared -o mydpi.so  mydpi.c  -I/`ncroot`/tools/inca/include

ncverilog +sv top.v +sv_lib=mydpi.so  +ncsimargs+"-sv_root ./" +linedebug 

----file ncverilog.log-------
ncsim> run
Array Handle is 938d8c8 
Array Pointer is 93f6a00 
Array Left 13, Array Right 4 
Array Low 4, Array High 13 
Size of Array in bytes 40 
DPI: 4 is: 77775559 
DPI: 5 is: 7777555a 
DPI: 6 is: 7777555b 
DPI: 7 is: 7777555c 
DPI: 8 is: 7777555d 
DPI: 9 is: 7777555e 
DPI: 10 is: 7777555f 
DPI: 11 is: 77775560 
DPI: 12 is: 77775561 
DPI: 13 is: 77775562 
DPI2: 0 22221111
DPI2: 1 22221112
DPI2: 2 22221113
DPI2: 3 22221114
DPI2: 4 22221115
DPI2: 5 22221116
DPI2: 6 22221117
DPI2: 7 22221118
DPI2: 8 22221119
DPI2: 9 2222111a
Vlog:           4 22221111
Vlog:           5 22221112
Vlog:           6 22221113
Vlog:           7 22221114
Vlog:           8 22221115
Vlog:           9 22221116
Vlog:          10 22221117
Vlog:          11 22221118
Vlog:          12 22221119
Vlog:          13 2222111a
ncsim: *W,RNQUIE: Simulation is complete.
ncsim> exit
TOOL:    ncverilog    05.83-p003: Exiting on Feb 05, 2007 at 11:29:36 EST  (total: 00:00:03)