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Home: Code Repository: Mastering Delphi 5

Project ODSDEMO

Project Structure


ODSDEMO.DPR

program OdsDemo;

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

{$R *.RES}

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

ODSFORM.PAS

unit OdsForm;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  public
    Total: Integer;
  end;

var
  Form1: TForm1;

implementation

uses
  Math;

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
  X, Y: extended;
begin
  X := 14.3;
  Y := 1 / GetTickCount;
  X := LogN (1/X, Y);
  Button1.Caption := IntToStr (Round (X));
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  I, J: Integer;
begin
  // J := 0; // omit this to get an error
  for I := 1 to 10000 do
    J := J + I;

{$IFDEF DEBUG}
  OutputDebugString (
    PChar ('Button2Click - I=' + IntToStr (I)));
{$ENDIF}

  Button1.Caption := 'J = ' + IntToStr (J);
  Inc (Total, J);
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  s1, s2: string;
begin
  s1 := Caption;
  s2 := s1;
  s2 [3] := 'X';
  Caption := s2;

  {$IFDEF DEBUG}
    OutputDebugString (
      PChar (s2));
  {$ENDIF}
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Total := 0;
end;

end.

ODSFORM.DFM

object Form1: TForm1
  Left = 192
  Top = 107
  Width = 289
  Height = 220
  Caption = 'OdsDemo'
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  OldCreateOrder = False
  OnCreate = FormCreate
  PixelsPerInch = 96
  TextHeight = 13
  object Button1: TButton
    Left = 96
    Top = 32
    Width = 75
    Height = 25
    Caption = 'Button1'
    TabOrder = 0
    OnClick = Button1Click
  end
  object Button2: TButton
    Left = 96
    Top = 72
    Width = 75
    Height = 25
    Caption = 'Button2'
    TabOrder = 1
    OnClick = Button2Click
  end
  object Button3: TButton
    Left = 96
    Top = 112
    Width = 75
    Height = 25
    Caption = 'Button3'
    TabOrder = 2
    OnClick = Button3Click
  end
end