Error occured while call session value from a view file

[eluser]Sumon[/eluser]
Hello all,

I am trying to call a session variable from a view file. Its related to user login. Just like to show Welcome Guest Name or Login....

Here is my class inside system/application/libraries

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
class login_operations
{
function IsLoggedIn()
{
if($this->session->userdata('UserId') != "")
return TRUE;
else
return FALSE;
}
}
?>

I call this IsLoggedIn() function from a view file as
if( $this->login_operations->IsLoggedIn() )
Some Html View...............

And I am getting this error

PHP Error was encountered
Severity: Notice
Message: Undefined property: login_operations::$session
Filename: libraries/login_operations.php
Line Number: 7

Fatal error: Call to a member function userdata() on a non-object in D:\xampp\htdocs\OneHotNanny\system\application\libraries\login_operations.php on line 7

Please help me to resolve..

[eluser]Armchair Samurai[/eluser]
To call CI resources from your own functions, you need to to use get_instance(). Check up on the Creating Libraries section in the User Guide.

Unless you've autoloaded the Session library, you'll also need to do so in your own library. For example.

Code:

class foo {

    function bar()
    {
        $ci =& get_instance();

        $ci->load->library('library');

        return $ci->library->function() != '' ? TRUE : FALSE;
    }

}

[eluser]Sumon[/eluser]
Thanks a lot... Infact my main question was:

1. Is there are any way to call a custom function of class located inside system/application/libraries?

2. Is it possible to call a controller from a view file? If yes then how?