Ctrl+Space无法关闭/打开输入法怎么办

以下是代码片段：

unit Unit1;

interface

uses

windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

Dialogs, StdCtrls,registry;

type

TForm1 = class(TForm)

btn1: TButton;

    procedure btn1Click(Sender: TObject);

private

{ Private declarations }

public

{ Public declarations }

end;

var

Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.btn1Click(Sender: TObject);

var

  reg :TRegistry;

  buffer :array[0..3] of Byte;

begin

//setLength(buffer,3);

  buffer[0]:= $02;

  buffer[1]:=$c0;

  buffer[2]:=$00;

  buffer[3]:=$00;

  reg:=TRegistry.Create;

  reg.rootKey:=HKEY_CURRENT_USER;

  if(reg.OpenKey('Control PanelInput MethodHot Keys0000010',false)) then

  begin

    reg.WriteBinaryData('Key Modifiers',buffer,4);

    showmessage('ok');

  end;

  reg.Free;

end;

end.