学习官方示例 - TApplication.OnException

本例演示了全局的异常捕获及处理, 并模拟激发了一个异常; 编译后, 单独运行一下生成的程序文件...

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本例效果图:

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代码文件:

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unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    Button1: TButton;

    procedure Button1Click(Sender: TObject);

    procedure FormCreate(Sender: TObject);

  private

    procedure AppException(Sender: TObject; E: Exception);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



type   

  MyException = Class(Exception);



procedure TForm1.FormCreate(Sender: TObject);

begin

  Application.OnException := AppException;

  Button1.Caption := '激发一个异常';

end;



procedure TForm1.AppException(Sender: TObject; E: Exception);

begin

  Application.ShowException(E);

  Application.Terminate;

end;



procedure TForm1.Button1Click(Sender: TObject);

begin

  raise MyException.Create('发生异常, 将要退出!');

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 151

  ClientWidth = 258

  Color = clBtnFace

  Font.Charset = DEFAULT_CHARSET

  Font.Color = clWindowText

  Font.Height = -11

  Font.Name = 'Tahoma'

  Font.Style = []

  OldCreateOrder = False

  Position = poDesktopCenter

  OnCreate = FormCreate

  PixelsPerInch = 96

  TextHeight = 13

  object Button1: TButton

    Left = 80

    Top = 64

    Width = 97

    Height = 25

    Caption = 'Button1'

    TabOrder = 0

    OnClick = Button1Click

  end

end