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1¡¢Ð½¨¹¤³Ì£»
2¡¢ÔÚform1ÉÏ·ÅÒ»¸öLabel£»
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     procedure WMDeviceChange(var Msg: TMessage); message WM_DEVICECHANGE;
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unit Unit1;
interface
uses
   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
   Dialogs, AppEvnts, ExtCtrls, StdCtrls;
type
   TForm1 = class(TForm)
     Label1: TLabel;
   private
     { Private declarations }
     procedure WMDeviceChange(var Msg: TMessage); message WM_DEVICECHANGE;
   public
     { Public declarations }
   end;
var
   Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.WMDeviceChange (var Msg: TMessage);
var
   myMsg : String;
begin
   Case Msg.WParam of
   32768:
     begin
       myMsg :='UÅ̲åÈë';
       Label1.Caption:=myMsg
     end;
   32772:
     begin
       myMsg :='UÅ̰γö';
       Label1.Caption:=myMsg;
     end;
   end;
end;
end.


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