按照那本上的所讲的，最近做了小实验，上传文件；首先，需要在根目录下建立一个新目录：uploads。然后再mainpage中增加一些代码，如下：
<html>
<head>
<title><?=$mytitle?></title>
</head>
<body>
<?=$menu?><br>
<?php echo $error;?>
<?php echo form_open_multipart('upload/do_upload');?>
<input type="file" name="userfile" size="20" />
<br /><br />
<input type="submit" value="upload" />
</form>
you are right!
</body>
</html>
然后按照书上所写，建立upload控制器：
<?php
class Upload extends CI_Controller {
function __construct()
{
parent::__construct();
$this->load->helper(array('form', 'url'));
// $this->load->library('upload');
}
function do_upload()
{
$config['upload_path'] = './uploads/';
$config['allowed_types'] = 'gif|jpg|png';
$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());
$this->load->view('upload_form', $error);
}
else
{
$data = array('upload_data' => $this->upload->data());
$this->load->view('upload_success', $data);
}
}
}
注意那行红色的代码。如果有此代码，无法上传。从CI中国论坛上查到，不需要这行，因为在后边还有一行：
$this->load->library('upload', $config);
upload_form内容如下：
<html>
<head>
<title></title>
</head>
<body>
<?php echo $error ?>
this is upload_form page
</body>
</html>
