How to use Zend_File_Transfer?

I have been using normal file upload element to upload files and validate them. But recently, I found out that implementing a Zend_file_tranfer gives much control over the file.

I am searched Everywhere in the internet searching for a simple example to get started with it, but none of them show how they are linked to the element. I dont know where to create the object of Zend_File_Transfer, and how to add it to the element? I basically dont know, how to use it.

Can anyone give me a beginners example of using zend_File_tranfers, in both zend_form and Zend_Controller_Action

When you create your form do something like this in your form:

$image = $this->getElement('image');
//$image = new Zend_Form_Element_File();
$image->setDestination(APPLICATION_PATH. "/../data/images"); //!!!!
$extension = $image->getFileName();
if (!empty($extension))
    {
        $extension = @explode(".", $extension);
        $extension = $extension[count($extension)-1];
        $image->addFilter('Rename', sprintf('logo-%s.'.$extension, uniqid(md5(time()), true)));
    }

$image
    ->addValidator('IsImage', false, $estensioni)//doesn't work on WAMPP/XAMPP/LAMPP
    ->addValidator('Size',array('min' => '10kB', 'max' => '1MB', 'bytestring' => true))//limit to 200k
    ->addValidator('Extension', false, $estensioni)// only allow images to be uploaded
    ->addValidator('ImageSize', false, array(
            'minwidth' => $img_width_min,
            'minheight' => $img_height_min,
            'maxwidth' => $img_width_max,
            'maxheight' => $img_height_max
            )
        )
    ->addValidator('Count', false, 1);// ensure that only 1 file is uploaded
// set the enctype attribute for the form so it can upload files
$this->setAttrib('enctype', 'multipart/form-data');

Then when you submit your form in your controller:

if ($this->_request->isPost() && $form->isValid($_POST)) {
            $data = $form->getValues();//also transfers the file
....