大家看看有什么 问题？

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  b: Boolean;
begin
  b := AnsiResemblesText('abc','apc');
  ShowMessage(BoolToStr(b)); {True}

  b := AnsiResemblesText('abc','agc');
  ShowMessage(BoolToStr(b)); {False}

  b := AnsiResemblesText('abc','aac');
  ShowMessage(BoolToStr(b)); {False}


end;
end.
这段代码一直不成功！什么原因啊