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unit uMainFrm;

interface

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

type
  TMainForm = class(TForm)
    btnPkgForm: TButton;
    medtOp1: TMaskEdit;
    medtOp2: TMaskEdit;
    btnAdd: TButton;
    lblResult: TLabel;
    procedure btnPkgFormClick(Sender: TObject);
    procedure btnAddClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
  //Defined the method signatures
  TAddEmProc = function(Op1, Op2 : Integer) : Integer; stdcall;
  TFunkFormProc = procedure; stdcall;
var
  MainForm: TMainForm;
const
  cFunkForm = 'FunkForm';
  cAddEm = 'AddEm';
implementation

{$R *.dfm}

procedure TMainForm.btnAddClick(Sender: TObject);
var
  PackageModule : THandle;
  AddEmProc : TAddEmProc;
  Rslt : Integer;
  Op1, Op2 : Integer;
begin
  PackageModule := LoadPackage('DdgRTFunk1.bpl');
  try
    @AddEmProc := GetProcAddress(PackageModule, PChar(cAddEm));
    if not (@AddEmProc = nil) then
    begin
      Op1 := StrToInt(medtOp1.Text);
      Op2 := StrToInt(medtOp2.Text);
      Rslt := AddEmProc(Op1, Op2);
      lblResult.Caption := IntToStr(Rslt);
    end;
  finally
    UnloadPackage(PackageModule);
  end;
end;

procedure TMainForm.btnPkgFormClick(Sender: TObject);
var
  PackageModule : THandle;
  FunkFormProc : TFunkFormProc;
begin
  PackageModule := LoadPackage('DdgRTFunk1.bpl');
  try
    @FunkFormProc := GetProcAddress(PackageModule, PChar(cFunkForm));
    if not (@FunkFormProc = nil) then
    begin
      FunkFormProc;
    end;
  finally
    UnloadPackage(PackageModule);
  end;
end;

end.