type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
procedure DoSomething; stdcall; external 'TESTLIB.DLL';

{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
begin
    DoSomething;
end;

end.
