Magento: Detect if admin is logged in in frontend pages

Question

I have created a magento extension. I want to implement access to the extension. The extension creates a page in frontend and i want only admin to access that page. So basically

Answer 1

Check this blog, I think you need not check with start() before checking with isLoggedIn().

Mage::getSingleton('core/session', array('name'=>'adminhtml')); // get sessions

$check = Mage::getSingleton('admin/session', array('name'=>'adminhtml')); //get admin sessions

    if($check->isLoggedIn()) { //check is admin logged in
        echo "Admin is logged in";
    } else {
        echo "Admin is offline";
    }