{....}
  private
    function RunCaptured(const _dirName, _exeName, _cmdLine: string): Boolean;

{....}

function TForm1.RunCaptured(const _dirName, _exeName, _cmdLine: string): Boolean;
var
  start: TStartupInfo;
  procInfo: TProcessInformation;
  tmpName: string;
  tmp: Windows.THandle;
  tmpSec: TSecurityAttributes;
  res: TStringList;
  return: Cardinal;
begin
  Result := False;
  try
    { Setze ein Temporäres File }
    { Set a temporary file }
    tmpName := 'Test.tmp';
    FillChar(tmpSec, SizeOf(tmpSec), #0);
    tmpSec.nLength := SizeOf(tmpSec);
    tmpSec.bInheritHandle := True;
    tmp := Windows.CreateFile(PChar(tmpName),
           Generic_Write, File_Share_Write,
           @tmpSec, Create_Always, File_Attribute_Normal, 0);
    try
      FillChar(start, SizeOf(start), #0);
      start.cb := SizeOf(start);
      start.hStdOutput := tmp;
      start.dwFlags := StartF_UseStdHandles or StartF_UseShowWindow;
      start.wShowWindow := SW_Minimize;
      { Starte das Programm }
      { Start the program }
      if CreateProcess(nil, PChar(_exeName + ' ' + _cmdLine), nil, nil, True,
                       0, nil, PChar(_dirName), start, procInfo) then
      begin
        SetPriorityClass(procInfo.hProcess, Idle_Priority_Class);
        WaitForSingleObject(procInfo.hProcess, Infinite);
        GetExitCodeProcess(procInfo.hProcess, return);
        Result := (return = 0);
        CloseHandle(procInfo.hThread);
        CloseHandle(procInfo.hProcess);
        Windows.CloseHandle(tmp);
        { Die Ausgaben hinzufügen }
        { Add the output }
        res := TStringList.Create;
        try
          res.LoadFromFile(tmpName);
          Memo1.Lines.AddStrings(res);
        finally
          res.Free;
        end;
        Windows.DeleteFile(PChar(tmpName));
      end
      else
      begin
        Application.MessageBox(PChar(SysErrorMessage(GetLastError())),
          'RunCaptured Error', MB_OK);
      end;
    except
      Windows.CloseHandle(tmp);
      Windows.DeleteFile(PChar(tmpName));
      raise;
    end;
  finally
  end;
end;

// Beispiel:

procedure TForm1.Button1Click(Sender: TObject);
begin
  RunCaptured('C:\', 'cmd.exe', '/c dir');
end;