Marco Cantù 1998, Mastering Delphi 4

Project: VARITEST.DPR


Project Structure


VARITEST.DPR

program VariTest;

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

{$R *.RES}

begin
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.

VARIFORM.PAS

unit VariForm;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
  V: Variant;
begin
  V := 10;
  Edit1.Text := V;
  V := 'Hello, World';
  Edit2.Text := V;
  V := 45.55;
  Edit3.Text := V;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  V: Variant;
  N: Integer;
begin
  V := Edit1.Text;
  N := Integer(V) * 2;
  V := N;
  Edit1.Text := V;
end;

end.

VARIFORM.DFM

object Form1: TForm1
  Left = 224
  Top = 117
  Width = 301
  Height = 168
  Caption = 'Variant Test'
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  PixelsPerInch = 96
  TextHeight = 13
  object Button1: TButton
    Left = 24
    Top = 32
    Width = 75
    Height = 25
    Caption = 'Assign'
    TabOrder = 0
    OnClick = Button1Click
  end
  object Edit1: TEdit
    Left = 136
    Top = 24
    Width = 121
    Height = 21
    TabOrder = 1
  end
  object Edit2: TEdit
    Left = 136
    Top = 56
    Width = 121
    Height = 21
    TabOrder = 2
  end
  object Edit3: TEdit
    Left = 136
    Top = 88
    Width = 121
    Height = 21
    TabOrder = 3
  end
  object Button2: TButton
    Left = 24
    Top = 72
    Width = 75
    Height = 25
    Caption = 'Compute'
    TabOrder = 4
    OnClick = Button2Click
  end
end


Copyright Marco Cantù 1998