unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls; type TForm1 = class(TForm) Button1: TButton; procedure Button1Click(Sender: TObject); end; var Form1: TForm1; implementation {$R *.dfm} var P: Pointer; procedure TForm1.Button1Click(Sender: TObject); begin if P = nil then RunError(204); end; end.
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文章来源:http://www.cnblogs.com/del/archive/2008/09/11/1289088.html