delphi字符串转换到指定格式的宽字符

unit Unit1;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    Edit1: TEdit;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Memo1Click(Sender: TObject);
  end;
var
  Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var
  str: string;
  pcw: PWideChar;
  cw: WideChar;
  i: Integer;
begin
  Memo1.Clear;
  str := Edit1.Text;
  pcw := PWideChar(str);
  for i := 0 to StrLen(pcw) - 1 do
  begin
    cw := (pcw+i)^;
    Memo1.Lines.Add(Format('$%.4x', [Ord(cw)]));
    //Memo1.Lines.Add(Format('$%.4x', [Ord(str[i+1])])); {也可以用这句替换上面两行}
  end;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
  Memo1.Clear;
  Memo1.Align := alLeft;
  Memo1.ScrollBars := ssVertical;
end;
procedure TForm1.Memo1Click(Sender: TObject);
var
  str: string;
begin
  str := Memo1.Lines[Memo1.CaretPos.Y];
  Text := WideChar(StrToIntDef(str, 0));
end;
end.