Ошибки при передаче в dll массива и его возвращение

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Grids, StdCtrls;
 
type
    Tpar = array of double;
    PTpar = ^Tpar;
 
type
  TForm1 = class(TForm)
    Button1: TButton;
    StringGrid1: TStringGrid;
    StringGrid2: TStringGrid;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
procedure arr(const a: Tpar; var b: Tpar); stdcall; external 'Project2.dll';
 
procedure TForm1.FormCreate(Sender: TObject);
begin
  with StringGrid1 do begin
    FixedCols := 0;
    Options := Options + [goEditing];
    ColCount := 10;
    RowCount := 2;
  end;
  with StringGrid2 do begin
    FixedCols := 0;
    ColCount := 10;
    RowCount := 2;
  end;
end;
 
procedure TForm1.Button1Click(Sender: TObject);
var
  a, b: Tpar;
  i, n: integer;
begin
  n := StringGrid1.ColCount;
  SetLength(a, n);
  SetLength(b, n);
  for i := 0 to High(a) do
    a[i] := StrToFloatDef(StringGrid1.Cells[i, 1], 0);
 
  arr(a, b);
 
  StringGrid2.ColCount := Length(b);
  for i := 0 to High(b) do
    StringGrid2.Cells[i, 1] := FloatToStr(b[i]);
end;
 
end.

library Project2;
 
{ Important note about DLL memory management: ShareMem must be the
  first unit in your library's USES clause AND your project's (select
  Project-View Source) USES clause if your DLL exports any procedures or
  functions that pass strings as parameters or function results. This
  applies to all strings passed to and from your DLL--even those that
  are nested in records and classes. ShareMem is the interface unit to
  the BORLNDMM.DLL shared memory manager, which must be deployed along
  with your DLL. To avoid using BORLNDMM.DLL, pass string information
  using PChar or ShortString parameters. }
 
uses
  ShareMem,
  SysUtils,
  Classes;
 
{$R *.res}
 
type
    Tpar = array of double;
    PTpar = ^Tpar;
 
procedure arr(const a: Tpar; var b: Tpar); stdcall;
var
  i: integer;
begin
  SetLength(b, length(a));
  b[Low(b)] := a[Low(a)];
  b[High(b)] := a[High(b)];
  for i := Low(b) + 1 to High(b) - 1 do
      b[i] := (a[i - 1] + a[i] + a[i + 1] / 3);
end;
 
exports
    arr;
 
begin
end.

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Grids, StdCtrls;
 
type
  TForm1 = class(TForm)
    Button1: TButton;
    StringGrid1: TStringGrid;
    StringGrid2: TStringGrid;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
type
  PDoubleArray = ^TDoubleArray;
  TDoubleArray = array[0..32767] of double;
 
procedure arr(a, b: PDoubleArray; Count: integer); stdcall; external 'Project2.dll';
 
procedure TForm1.FormCreate(Sender: TObject);
begin
  with StringGrid1 do begin
    FixedCols := 0;
    Options := Options + [goEditing];
    ColCount := 10;
    RowCount := 2;
  end;
  with StringGrid2 do begin
    FixedCols := 0;
    ColCount := 10;
    RowCount := 2;
  end;
end;
 
procedure TForm1.Button1Click(Sender: TObject);
var
  a, b: array of double;
  i, n: integer;
begin
  n := StringGrid1.ColCount;
  SetLength(a, n);
  SetLength(b, n); // Оба массива готовятся заранее
  for i := 0 to High(a) do
    a[i] := StrToFloatDef(StringGrid1.Cells[i, 1], 0);
 
  arr(@a[0], @b[0], Length(a));
 
  StringGrid2.ColCount := Length(b);
  for i := 0 to High(b) do
    StringGrid2.Cells[i, 1] := FloatToStr(b[i]);
end;
 
end.

library Project2;
 
{ Important note about DLL memory management: ShareMem must be the
  first unit in your library's USES clause AND your project's (select
  Project-View Source) USES clause if your DLL exports any procedures or
  functions that pass strings as parameters or function results. This
  applies to all strings passed to and from your DLL--even those that
  are nested in records and classes. ShareMem is the interface unit to
  the BORLNDMM.DLL shared memory manager, which must be deployed along
  with your DLL. To avoid using BORLNDMM.DLL, pass string information
  using PChar or ShortString parameters. }
 
uses
  SysUtils,
  Classes;
 
{$R *.res}
 
type
  PDoubleArray = ^TDoubleArray;
  TDoubleArray = array[0..32767] of double;
 
procedure arr(a, b: PDoubleArray; Count: integer); stdcall;
var
  i: integer;
begin
  b[0] := a[0];
  b[Count-1] := a[Count-1];
  for i := 1 to Count-2 do
    b[i] := (a[i - 1] + a[i] + a[i + 1] / 3);
end;
 
exports
    arr;
 
begin
end.