unit unitfile;

interface

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

type

  TComp = Class
  public
    function Max(x,y:Integer):Integer;virtual;abstract;
    function Min(x,y:Integer):Integer;virtual;abstract;
  end;

  TForm1 = class(TForm)
    LabeledEdit1: TLabeledEdit;
    LabeledEdit2: TLabeledEdit;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Memo1: TMemo;
    Label1: TLabel;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
    { Private declarations }
    MyComp:TComp;
  public
    { Public declarations }
  end;

//創建對象的函數的聲明
function CreateCompImpl:TComp;stdcall;external 'dllserver\dllcomserver.dll';
//Add函數的聲明
function Add(x,y:Integer):Integer;stdcall;external 'dllserver\dllcomserver.dll';
//Multi函數的聲明
function Multi(x,y:Integer):Integer;stdcall;external 'dllserver\dllcomserver.dll';

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  MyComp := CreateCompImpl;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Memo1.Lines.Append('兩數相加的結果是：'+IntToStr(Add(StrToInt(LabeledEdit1.Text),
       StrToInt(LabeledEdit2.Text))));
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  Memo1.Lines.Append('兩數相乘的結果是：'+IntToStr(Multi(StrToInt(LabeledEdit1.Text),
       StrToInt(LabeledEdit2.Text))));
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  Memo1.Lines.Append('兩數的最大值是：'+IntToStr(MyComp.Max(StrToInt(LabeledEdit1.Text),
       StrToInt(LabeledEdit2.Text))));
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
  Memo1.Lines.Append('兩數的最小值是：'+IntToStr(MyComp.Min(StrToInt(LabeledEdit1.Text),
       StrToInt(LabeledEdit2.Text))));
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  MyComp.Free;
end;

end.