delphi 中的delay函数

procedure Delay(msecs:integer);
var
Tick: DWord;
Event: THandle;
begin
Event := CreateEvent(nil, False, False, nil);
try
    Tick := GetTickCount + DWord(msecs);
    while (msecs > 0) and (MsgWaitForMultipleObjects(1, Event, False, msecs, QS_ALLINPUT) <> WAIT_TIMEOUT) do
    begin
      Application.ProcessMessages;
      msecs := Tick - GetTickcount;
    end;
finally
    CloseHandle(Event);
end;
end;