TYPO3 6.1 - how can I login a fe_user via code? - typo3

Question

I am using TYPO3 6.1 and try to login a FE user via Code (included via PHP and USER_INT).
This code does not work for me. :( Any ideas why?
// try to login the user now
$loginData = array(
'uname' => trim($postData['username']), //usernmae
'uident' => trim($postData['password']), //password
'status' => 'login'
);
// $GLOBALS['TSFE']->fe_user-checkPid=0; //do not use a particular pid
$GLOBALS['TSFE']->fe_user->checkPid = $this->feUserPid; // ''; //do not use a particular pid
$info = $GLOBALS['TSFE']->fe_user->getAuthInfoArray();
//
$user = $GLOBALS['TSFE']->fe_user->fetchUserRecord(
$info['db_user'], $loginData['uname']
);
$ok = $GLOBALS['TSFE']->fe_user->compareUident($user, $loginData);
//
if($ok)
{
// login successfull
$GLOBALS['TSFE']->fe_user->createUserSession($user);
//
$content = '<h3 class="green">LOGIN OK!</h3>';
$content .= '<p>Sie sind eingeloggt als ' . $feUsername . ' und wurden nun weitergeleitet...</p>';
}
else
{
// login failed
$content = '<h3 class="red">LOGIN FAILED!</h3>';
}
Thanks for any hint!

Answer 1

Starting with TYPO3 4.7, you must use $loginData['uident_text'] instead of $loginData['uident'] for the password.
If the problem persists, please give more information what exactly is going wrong, what your log says etc.

Answer 2

Does compareUident() return TRUE for you?
I, fx have a case, where I automatically log in user that has just created themselves. And compareUident() didn't work for me for some reason, but as I know this same website visitor just created the user, I skip that function and continue on initiating all the session variables. The following is a working code on TYPO3 6.1:
$loginData = array(
'uname' => $postdata['username'],
'uident' => $postdata['password'],
'status' => 'login',
);
$GLOBALS['TSFE']->fe_user->checkPid = 0;
$info = $GLOBALS['TSFE']->fe_user->getAuthInfoArray();
$user = $GLOBALS['TSFE']->fe_user->fetchUserRecord($info['db_user'], $loginData['uname']);
//if($GLOBALS['TSFE']->fe_user->compareUident($user, $loginData)) {
$GLOBALS['TSFE']->fe_user->user = $GLOBALS['TSFE']->fe_user->fetchUserSession();
$GLOBALS['TSFE']->loginUser = 1;
$GLOBALS['TSFE']->fe_user->fetchGroupData();
$GLOBALS['TSFE']->fe_user->start();
$GLOBALS['TSFE']->fe_user->createUserSession($user);
$GLOBALS['TSFE']->fe_user->loginSessionStarted = TRUE;
//}
Inspired by:
https://stackoverflow.com/a/7738383/445364
https://typo3.org/extensions/repository/view/dix_easylogin