关于在DLL里消息处理的问题！ (30分)

为什么我在DLL里写的：<br>unit Unit1;//DLL里的一个单元<br>interface<br>uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, winsock,<br>&nbsp; StdCtrls;<br>&nbsp;const<br>&nbsp; WM_SOCK = WM_USER + 1; &nbsp; &nbsp; //自定义windows消息<br>&nbsp; UDPPORT = 6767;<br>&nbsp;var &nbsp;s:TSocket;<br>&nbsp; &nbsp; addr: TSockAddr;<br>&nbsp; &nbsp; FSockAddrIn : TSockAddrIn;<br>&nbsp; &nbsp; var<br>&nbsp; &nbsp;TempWSAData: TWSAData;<br>&nbsp; &nbsp; &nbsp; &nbsp; //利用消息实时获知UDP消息<br>&nbsp;procedure ReadData(var Message: TMessage);message WM_SOCK;<br><br>implementation<br><br>略。。。<br>提示我不能识别“message ”这个关键字，请问为什么啊？该这么办？谢谢<br>

写在类里面

什么类里？