Delphi 判断当前系统是否64位

uses Winapi.Windows;
function IsWin64: Boolean;
var
IsWow64Process: function(Handle:  THandle; var Res:  BOOL): BOOL; stdcall;
  GetNativeSystemInfo: procedure(var lpSystemInfo: TSystemInfo); stdcall;
  Kernel32Handle: THandle;

  isWoW64: Bool;
  SystemInfo: TSystemInfo;
const
  PROCESSOR_ARCHITECTURE_AMD64 = 9;
  PROCESSOR_ARCHITECTURE_IA64 = 6;
begin
  Kernel32Handle := GetModuleHandle('KERNEL32.DLL');
  if Kernel32Handle = 0 then
    Kernel32Handle := LoadLibrary('KERNEL32.DLL');
  if Kernel32Handle <> 0 then
  begin
    IsWOW64Process := GetProcAddress(Kernel32Handle,'IsWow64Process');
    GetNativeSystemInfo := GetProcAddress(Kernel32Handle,'GetNativeSystemInfo');
    if Assigned(IsWow64Process) then
    begin
      IsWow64Process(GetCurrentProcess,isWoW64);
      Result := isWoW64 and Assigned(GetNativeSystemInfo);
      if Result then
      begin
        GetNativeSystemInfo(SystemInfo);
        Result := (SystemInfo.wProcessorArchitecture = PROCESSOR_ARCHITECTURE_AMD64) or
                  (SystemInfo.wProcessorArchitecture = PROCESSOR_ARCHITECTURE_IA64);
      end;
    end
    else Result := False;
  end
  else Result := False;
end;