多维动态数组与多维动态数组指针 - 回复 "lz_whj" 的问题

问题来源: http://www.cnblogs.com/del/archive/2008/05/28/1208964.html#1211428

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本例效果图:

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    Button2: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  Memo1.Align := alLeft;
end;

{多维动态数组}
procedure TForm1.Button1Click(Sender: TObject);
var
  Arr: array of array of array of Integer; {定义一个三维动态数组}
  i,j,k,ic,jc,kc: Integer;
begin
  {设置数组}
  SetLength(Arr, 2,3,4);

  {获取各维的维数}
  ic := Length(Arr);
  jc := Length(Arr[0]);
  kc := Length(Arr[0][0]);

  {赋值}
  for i := 0 to ic - 1 do
    for j := 0 to jc - 1 do
      for k := 0 to kc - 1 do
        Arr[i][j][k] := Random(100);

  {取值}
  Memo1.Clear;
  for i := 0 to ic - 1 do
    for j := 0 to jc - 1 do
      for k := 0 to kc - 1 do
        Memo1.Lines.Add(Format('Arr[%d][%d][%d] = %d', [i, j, k, Arr[i][j][k]]));
end;


{多维动态数组指针}
procedure TForm1.Button2Click(Sender: TObject);
Type
  TMyArr = array of array of array of Integer; {定义一个三维动态数组类型}
var
  PArr: ^TMyArr; {动态数组指针变量}
  i,j,k,ic,jc,kc: Integer;
begin
  {用作维数的变量}
  ic := 2;
  jc := 3;
  kc := 4;

  {分配内存; 按说动态数组还需要 8 个管理字节, 我不知道 Delphi 是怎么协调的}
  GetMem(PArr, ic * jc * kc * SizeOf(Integer));

  {设置数组}
  SetLength(PArr^, ic,jc,kc);

  {赋值}
  for i := 0 to ic - 1 do
    for j := 0 to jc - 1 do
      for k := 0 to kc - 1 do
        PArr^[i][j][k] := Random(100);

  {取值}
  Memo1.Clear;
  for i := 0 to ic - 1 do
    for j := 0 to jc - 1 do
      for k := 0 to kc - 1 do
        Memo1.Lines.Add(Format('Arr[%d][%d][%d] = %d', [i, j, k, PArr^[i][j][k]]));

  {自己分配的内存要负责释放}      
  FreeMem(PArr);
end;

end.