I think the code is correct. But.........

Code:

class Ungxu extends Controller

{

  function Ungxu()

{

    parent::Controller();

    $this->load->model('tintuc_model','tintuc');

    $this->load->helper('form','url');

}

}

function index()

{

       $this->load->view('ungxu', array('error' => ' ' ));// pass error argument

       // attach file upload (if have)

            

            if(isset($_POST['filename']))

            {

                $this->doUpload();

                $this->email->attach('/uploads/folder/$file_name');

        }

}

function doUpload()

    {

        $config['upload_path'] = '/uploads/ungxu/';

        $config['allowed_types'] = 'doc|txt|rar';

        $config['max_size']    = '100';

        $config['max_width']  = '1024';

        $config['max_height']  = '768';

        

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

            

            if ( ! $this->upload->do_upload())

            {

                $error = array('error' => $this->upload->display_errors());

                $data['content'] = $this->load->view('dangky', $error, true);

            }    

            else

            {

                $upload_data = $this->upload->data();

                $filename = $upload_data['file_name'];

            }



    }

Code:

<tr>

&lt;?=$error;?&gt;

    &lt;?=form_open_multipart('ungxu/doUpload'); ?&gt;



      <td style="width: 198px">

      &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; Tài liệu đính kèm</td>

      <td>&lt;input name="filename" type="file" id="filename" /&gt; (Tối đa 1MB)</td>

</tr>

<tr>

    <td align="center" colspan="2">

     &lt;input type="submit" name="submit" value="Gửi" id="send" style="width:70px;" 

&lt;input type="reset" value="Làm lại" /&gt;                            

    </td&gt;

</tr>

   </table>                

  &lt;/form&gt;