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Home: Code Repository: Mastering Delphi 6

Chapter 03 - Project Reintr

Project Structure

Reintr.dpr
program Reintr;

uses
  Forms,
  ReintrF in 'ReintrF.pas' {Form1};

{$R *.RES}

begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.
ReintrF.pas
unit ReintrF;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

type
  TMyClass = class
    procedure One; overload; virtual;
    procedure One (I: Integer); overload;
  end;

  TMySubClass = class (TMyClass)
    procedure One; overload; override;
    procedure One (S: string); reintroduce; overload;
  end;

  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

{ MyClass }

procedure TMyClass.One;
begin
  ShowMessage ('MyClass.One');
end;

procedure TMyClass.One(I: Integer);
begin
  ShowMessage ('Integer: ' + IntToStr (I));
end;

{ MySubClass }

procedure TMySubClass.One;
begin
  ShowMessage ('MySubClass.One');
end;

procedure TMySubClass.One(S: string);
begin
  ShowMessage ('String: ' + S);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  Obj: TMySubClass;
begin
  Obj := TMySubClass.Create;
  Obj.One;
  Obj.One (10);
  Obj.One ('Hello');
  Obj.Free;
end;

end.
ReintrF.dfm
object Form1: TForm1
  Left = 192
  Top = 107
  Width = 182
  Height = 127
  Caption = 'Reintr'
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
  object Button1: TButton
    Left = 48
    Top = 32
    Width = 75
    Height = 25
    Caption = 'Test'
    TabOrder = 0
    OnClick = Button1Click
  end
end