有谁知Plug & play 的 (200分)

有谁知Plug & play 的

系统会发出WM_DEVICECHANGE消息。<br><br>unit Unit1;<br><br>interface<br><br>uses<br>&nbsp; Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,<br>&nbsp; Dialogs;<br><br>type<br>&nbsp; TForm1 = class(TForm)<br>&nbsp; private<br>&nbsp; &nbsp; { Private declarations }<br>&nbsp; public<br>&nbsp; &nbsp; procedure WndProc(var Message: TMessage); override;<br>&nbsp; &nbsp; { Public declarations }<br>&nbsp; end;<br><br>var<br>&nbsp; Form1: TForm1;<br><br>implementation<br><br>{$R *.dfm}<br><br>procedure TForm1.WndProc(var Message: TMessage);<br>begin<br>&nbsp; inherited;<br>&nbsp; if Message.Msg = WM_DEVICECHANGE then<br>&nbsp; begin<br>&nbsp; &nbsp; // 系统硬件改变了<br>&nbsp; end;<br>end;<br><br>end.<br>

http://www.tiantiansoft.com/Article_Show.asp?ArticleID=97<br>参考一下。

接受答案了.