CodeIgniter错误:致命错误:从上下文'CI_Loader'调用私有IOFactory::__c


CodeIgniter Error : Fatal error: Call to private IOFactory::__construct() from context 'CI_Loader'

我试图通过codeigniter实现PHPExcel,我得到这个错误

 class Users extends CI_Controller {
/**
 * Index Page for this controller.
 *
 * Maps to the following URL
 *      http://example.com/index.php/welcome
 *  - or -  
 *      http://example.com/index.php/welcome/index
 *  - or -
 * Since this controller is set as the default controller in 
 * config/routes.php, it's displayed at http://example.com/
 *
 * So any other public methods not prefixed with an underscore will
 * map to /index.php/welcome/<method_name>
 * @see http://codeigniter.com/user_guide/general/urls.html
 */

public function _construct()
{
}

public function index()
{

    $this->load->library('phpexcel');
    $this->load->library('PHPExcel/iofactory');
    $objPHPExcel = new PHPExcel();
    $objPHPExcel->getProperties()->setTitle("title")
                     ->setDescription("description");

    // Assign cell values
    $objPHPExcel->setActiveSheetIndex(0);
    $objPHPExcel->getActiveSheet()->setCellValue('A1', 'cell value here');
    // Save it as an excel 2003 file
    $objWriter = IOFactory::createWriter($objPHPExcel, 'Excel5');
    $objWriter->save("nameoffile.xls");
}
}
/* End of file welcome.php */
/* Location: ./application/controllers/welcome.php */

我得到这个错误:

Fatal error: Call to private IOFactory::__construct() from context 'CI_Loader' in F:'xampp'htdocs'import'system'core'Loader.php on line 1099

类Users扩展CI_Controller {

function __construct()
{
    **parent::__construct();**
}
function index()
{
   $this->load->library('phpexcel');
   $this->load->library('PHPExcel/iofactory');
   $objPHPExcel = new PHPExcel();
   $objPHPExcel->getProperties()->setTitle("title")
                 ->setDescription("description");

   // Assign cell values
   $objPHPExcel->setActiveSheetIndex(0);
   $objPHPExcel->getActiveSheet()->setCellValue('A1', 'cell value here');
   // Save it as an excel 2003 file
   $objWriter = IOFactory::createWriter($objPHPExcel, 'Excel5');
   $objWriter->save("nameoffile.xls");
}

}

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