Delphi IDE阻止发送消息

似乎ide会阻止向其他应用程序发送消息.
我在win7 64bit和borland 2006上使用WM_COPYDATA.

任何的想法？

寄件人：

procedure TForm1.Button1Click(Sender: TObject);
  var dst: THandle;
      stringToSend : string;
      copyDataStruct : TCopyDataStruct;
  begin
     stringToSend := 'Hello';
     copyDataStruct.dwData := 0; //use it to identify the message contents
     copyDataStruct.cbData := 1 + Length(stringToSend) ;
     copyDataStruct.lpData := PChar(stringToSend) ;
     SendData(copyDataStruct) ;
  end;

procedure TForm1.SendData(const copyDataStruct: TCopyDataStruct) ;
 var
   receiverHandle : THandle;
   res : integer;
 begin
   receiverHandle := findwindow( pchar('TForm2'),pchar('Form2') );
   if receiverHandle = 0 then
   begin
     ShowMessage('CopyData Receiver NOT found!') ;
     Exit;
   end;

   res := SendMessage(receiverHandle,WM_COPYDATA,Integer(Handle),Integer(@copyDataStruct)) ;

 end;
end.

接收方部分：

TForm2 = class(TForm)
  private
    procedure WMCopyData(var Msg: TWMCopyData ); message WM_COPYDATA;
  public
  end;

var
  Form2: TForm2;

implementation

{$R *.dfm}

{ TReceiver }


procedure TForm2.WMCopyData( var Msg: TWMCopyData );
  begin
    ShowMessage( 'Received' );
  end;