How to get the NT Domain and Username of a process?

uses
  TlHelp32;
 
type
  PTOKEN_USER = ^TOKEN_USER;
  _TOKEN_USER = record
    User: TSidAndAttributes;
  end;
  TOKEN_USER = _TOKEN_USER;
 
function GetUserAndDomainFromPID(ProcessId: DWORD;
  var User, Domain: string): Boolean;
var
  hToken: THandle;
  cbBuf: Cardinal;
  ptiUser: PTOKEN_USER;
  snu: SID_NAME_USE;
  ProcessHandle: THandle;
  UserSize, DomainSize: DWORD;
  bSuccess: Boolean;
begin
  Result := False;
  ProcessHandle := OpenProcess(PROCESS_QUERY_INFORMATION, False, ProcessId);
  if ProcessHandle <> 0 then
  begin
  //  EnableProcessPrivilege(ProcessHandle, 'SeSecurityPrivilege', True);
    if OpenProcessToken(ProcessHandle, TOKEN_QUERY, hToken) then
    begin
      bSuccess := GetTokenInformation(hToken, TokenUser, nil, 0, cbBuf);
      ptiUser  := nil;
      while (not bSuccess) and (GetLastError = ERROR_INSUFFICIENT_BUFFER) do
      begin
        ReallocMem(ptiUser, cbBuf);
        bSuccess := GetTokenInformation(hToken, TokenUser, ptiUser, cbBuf, cbBuf);
      end;
      CloseHandle(hToken);
 
      if not bSuccess then
      begin
        Exit;
      end;
 
      UserSize := 0;
      DomainSize := 0;
      LookupAccountSid(nil, ptiUser.User.Sid, nil, UserSize, nil, DomainSize, snu);
      if (UserSize <> 0) and (DomainSize <> 0) then
      begin
        SetLength(User, UserSize);
        SetLength(Domain, DomainSize);
        if LookupAccountSid(nil, ptiUser.User.Sid, PChar(User), UserSize,
          PChar(Domain), DomainSize, snu) then
        begin
          Result := True;
          User := StrPas(PChar(User));
          Domain := StrPas(PChar(Domain));
        end;
      end;
 
      if bSuccess then
      begin
        FreeMem(ptiUser);
      end;
    end;
    CloseHandle(ProcessHandle);
  end;
end;
 
procedure TForm1.Button1Click(Sender: TObject);
var
  hProcSnap: THandle;
  pe32: TProcessEntry32;
  Domain, User: string;
  s: string;
begin
 
  hProcSnap := CreateToolHelp32SnapShot(TH32CS_SNAPALL, 0);
  if hProcSnap = INVALID_HANDLE_VALUE then Exit;
 
  pe32.dwSize := SizeOf(ProcessEntry32);
 
  if Process32First(hProcSnap, pe32) = True then
    while Process32Next(hProcSnap, pe32) = True do
    begin
 
      if GetUserAndDomainFromPID(pe32.th32ProcessID, User, Domain) then
      begin
        s := Format('%s User: %s ; Domain: %s',[StrPas(pe32.szExeFile), User, Domain]);
        Listbox1.Items.Add(s);
      end else
        Listbox1.Items.Add(StrPas(pe32.szExeFile));
    end;
  CloseHandle(hProcSnap);
end;

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