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