php - file input not work in joomla 2.5 component -

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i have simple component must upload file server, when submit form see error:

notice: undefined index: uploaded_file in d:\wamp\www\joomla2.5\components\com_print\print.php on line 13

component in frontend , code is:

<?php // no direct access defined('_jexec') or die; jimport('joomla.application.component.controller');  ?> <form enctype="multipart/form-data" action="<?php $_server['php_self']; ?>" method="post">     <input type="hidden" name="max_file_size" value="1000000" />     choose file upload: <input name="uploaded_file" type="file" />     <input type="submit" value="upload" /> </form> <?php echo $_post['uploaded_file']; echo $_post['max_file_size']; ?>

please help.

the datas input of type "file" in $_files not $_post

var_dump($_files['uploaded_file']);

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