var
  OriginalWordBreakProc: pointer;
  NewWordBreakProc: pointer;

function MyWordBreakProc(LPTSTR: pchar;
  ichCurrent: integer;
  cch: integer;
  code: integer): integer
{$IFDEF WIN32} stdcall;
{$ELSE}; export;
{$ENDIF}
begin
  result := 0;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  OriginalWordBreakProc := Pointer(
    SendMessage(Memo1.Handle,
    EM_GETWORDBREAKPROC,
    0,
    0));
{$IFDEF WIN32}
  NewWordBreakProc := @MyWordBreakProc;
{$ELSE}
  NewWordBreakProc := MakeProcInstance(@MyWordBreakProc,
    hInstance);
{$ENDIF}
  SendMessage(Memo1.Handle,
    EM_SETWORDBREAKPROC,
    0,
    longint(NewWordBreakProc));

end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  SendMessage(Memo1.Handle,
    EM_SETWORDBREAKPROC,
    0,
    longint(@OriginalWordBreakProc));
{$IFNDEF WIN32}
  FreeProcInstance(NewWordBreakProc);
{$ENDIF}
end;