在数据类型中如何判断windows版本而做不同的定义？（类似C中)(100分)

例如：
RASCONNW
{
DWORD dwSize;
HRASCONN hrasconn;
WCHAR szEntryName[ RAS_MaxEntryName + 1 ];

#if (WINVER >= 0x400)
WCHAR szDeviceType[ RAS_MaxDeviceType + 1 ];
WCHAR szDeviceName[ RAS_MaxDeviceName + 1 ];
#endif
#if (WINVER >= 0x401)
WCHAR szPhonebook [ MAX_PATH ];
DWORD dwSubEntry;
#endif
};
应该如何转成delphi形式呢？

在数据库里不知道怎么作，在系统外面可以简单的处理。
procedure TAboutBox.GetOSInfo;
var
Platform: string;
BuildNumber: Integer;
begin
case Win32Platform of
VER_PLATFORM_WIN32_WINDOWS:
begin
Platform := 'Windows 95/8';
BuildNumber := Win32BuildNumber and $0000FFFF;
end;
VER_PLATFORM_WIN32_NT:
begin
Platform := 'Windows NT';
BuildNumber := Win32BuildNumber;
end;
else
begin
Platform := 'Windows';
BuildNumber := 0;
end;
end;
if (Win32Platform = VER_PLATFORM_WIN32_WINDOWS) or
(Win32Platform = VER_PLATFORM_WIN32_NT) then
begin
if Win32CSDVersion = '' then
OS.Caption := Format('%s %d.%d (Build %d)', [Platform, Win32MajorVersion,
Win32MinorVersion, BuildNumber])
else
OS.Caption := Format('%s %d.%d (Build %d: %s)', [Platform, Win32MajorVersion,
Win32MinorVersion, BuildNumber, Win32CSDVersion]);
end
else
OS.Caption := Format('%s %d.%d', [Platform, Win32MajorVersion,
Win32MinorVersion])
end;