获取操作系统版本

function GetWindowsVersion: string;
var
  AWin32Version: Extended;
  os: string;
begin
  os := 'Windows';
  AWin32Version := StrToFloat(Format('%d.%d',[Win32MajorVersion,Win32MinorVersion]));
  if Win32Platform = ver_platform_win32s then
    Result := os + '32'
  else if Win32Platform = ver_platform_win32_windows then
  begin
    if AWin32Version = 4.0 then
      Result := os + '95'
    else if AWin32Version = 4.1 then
      Result := os + '98'
    else if AWin32Version = 4.9 then
      Result := os + 'Me'
    else
      Result := os + '9x'
  end else if Win32Platform = VER_PLATFORM_WIN32_NT then
  begin
    if AWin32Version = 3.15 then
      Result := os + 'NT 3.51'
    else if AWin32Version = 4.0 then
      Result := os + 'NT 4.0'
    else if AWin32Version = 5.0 then
      Result := os + '2000'
    else if AWin32Version = 5.1 then
      Result := os + 'XP'
    else if AWin32Version = 5.2 then
      Result := os + '2003'
    else if AWin32Version = 6.0 then
      Result := os + 'Vista'
    else if AWin32Version = 6.1 then
      Result := os + '7'
    else
      Result := os ;
  end else Result := os + '??';
  Result := Result + '   ' +GetWindowsVersionString;
end;

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;