function do_upload()
 {
  $config['upload_path'] = './uploads/';
  $config['allowed_types'] = 'bin.gz'; //是不是这个类型错了？

  $this->load->library('upload', $config);

  if ( ! $this->upload->do_upload())
  {
   $error = array('error' => $this->upload->display_errors());
   
   $this->load->view('upload_form', $error);
  } 
  else
  {
   $data = array('upload_data' => $this->upload->data());
   
   $this->load->view('upload_success', $data);
  }
 }