unit Unit1;

interface

uses

  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,

  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type

  TForm1 = class(TForm)

    Memo1: TMemo;

    procedure FormCreate(Sender: TObject);

  private

    { Private declarations }

  public

    { Public declarations }

  end;

var

  Form1: TForm1;

implementation

{$R *.dfm}

function GetWindowsVersionString : AnsiString;

var

VI: TOSVersionInfoA;

begin

  VI.dwOSVersionInfoSize := SizeOf(TOSVersioninfoA);

  if GetVersionExA(VI) then

  with VI do

  Result := Trim (

  Format(

      '%d.%d build %d %s',

      [dwMajorVersion, dwMinorVersion,dwBuildNumber,szCSDVersion]

  )

  )

  else

  Result:= '';

end;

procedure TForm1.FormCreate(Sender: TObject);

begin

Showmessage(GetWindowsVersionString);

end;

end.