delphi判断windows系统是64位还是32位

function IsWin64: boolean;
var 
  Kernel32Handle: THandle;   
  IsWow64Process: function(Handle: Windows.THandle; var Res: Windows.BOOL): Windows.BOOL; stdcall;   
  GetNativeSystemInfo: procedure(var lpSystemInfo: TSystemInfo); stdcall;   
  isWoW64: Bool;   
  SystemInfo: TSystemInfo;   
const 
  PROCESSOR_ARCHITECTURE_AMD64 = 9;   
  PROCESSOR_ARCHITECTURE_IA64 = 6;
begin 
  Result := False;
  Kernel32Handle := GetModuleHandle('KERNEL32.DLL');
  if Kernel32Handle = 0 then
    Kernel32Handle := LoadLibrary('KERNEL32.DLL');
  if Kernel32Handle <> 0 then
  begin
    IsWOW64Process := GetProcAddress(Kernel32Handle,'IsWow64Process');
    //GetNativeSystemInfo函数从Windows XP开始才有，而IsWow64Process函数从Windows XP SP2以及Windows Server 2003 SP1开始才有。
    //所以使用该函数前最好用GetProcAddress。
    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;
  end;
end;