yii上传文件的问题。 [ 新手入门 ]

看一下这个教程！
http://www.yiichina.com/tutorial/11

感谢舰长。thanks

文件上传不了。

class PictureController extends Controller
{
    public function actionCreate()
    {
        $model=new Picture;

        // Uncomment the following line if AJAX validation is needed
        // $this->performAjaxValidation($model);
        if(isset($_POST['Picture']))
        {
            $model->attributes=$_POST['Picture'];
            $model->d=CUploadedFile::getInstance($model,'d');
            if($model->save())
            {
                $model->d->saveAs('images/123.png');
            }
            $this->redirect(array('admin'));
        }

        $this->render('create',array(
            'model'=>$model,
        ));
    }
}

视图文件：

<div class="row">
    <?php echo $form->labelEx($model,'d'); ?>
    <?php echo CHtml::activeFileField($model, 'd'); ?>
    <?php echo $form->error($model,'d'); ?>	
</div>
<div class="row buttons">
    <?php echo CHtml::submitButton($model->isNewRecord ? 'Create' : 'Save'); ?>
</div>