var
  str: string;
  n: Cardinal;
  pstr: PString;
begin
  str := 'ABCDE';
  n := Cardinal(str); {获取内存地址}
  pstr := @str;       {现在 pstr 是 str 的指针}

  {n 与 pstr 的数字结果是(结果是随机的, 知道不一样就行了):}
  ShowMessage(IntToStr(n));              {4571092}
  ShowMessage(IntToStr(Cardinal(pstr))); {1244652}

  {但通过 pstr 可以找到 str}
  ShowMessage(pstr^); {ABCDE}
end;

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  str: string;
  ps: PChar;
  n: Cardinal;
begin
  str := 'ABCDE';
  ps := PChar(str);
  n := Cardinal(ps);
  //n := Cardinal(str); {这行可以代替上面两行}
  ShowMessage(IntToStr(n)); {结果是 Windows 随机管理的}

  ShowMessage(PChar(n));   {ABCDE}
  ShowMessage(PChar(n+1)); {BCDE}
  ShowMessage(PChar(n+2)); {CDE}
  ShowMessage(PChar(n+3)); {DE}
  ShowMessage(PChar(n+4)); {E}
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  str: string;
  n: Cardinal;
  pb: PByte;
begin
  str := 'ABCDE';
  n := Cardinal(str);
  ShowMessage(IntToStr(n)); {4571140; 这是我这里的结果, 这是随机的}

  pb := PByte(n);
  ShowMessage(IntToStr(pb^)); {65}
  pb := PByte(n+1);
  ShowMessage(IntToStr(pb^)); {66}
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  str: string;
  n: Cardinal;
  pint: PInteger;
begin
  str := 'ABCDE';
  n := Cardinal(str);
  ShowMessage(IntToStr(n)); {4571140; 这是我这里的结果, 这是随机的}

  pint := PInteger(n);
  ShowMessage(IntToStr(pint^)); {1145258561}
  pint := PInteger(n+1);
  ShowMessage(IntToStr(pint^)); {1162101570}
end;

end.