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学习官方示例 - System.RunError
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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