why this don't work?

function getResults() {

$iPageLength = 5;

$dos = DataObject::get('Problema');

$dos->setPageLength($iPageLength);

//echo $dos->TotalPages();
$i=5;

$dos->getRange($i*$iPageLength,$iPageLength);
}

this code place in dataobjectmanager... i need a controler? in my dataobjectmanager?

XXXXPage_Controller - the controller of the page you want this on or in Page_Controller if you want this "control" available on all pages.

this is based on a guess because "this don't work" is not a very helpful description of the result of using this as a function - you need to detail where the code is placed, template code calling it and if there is no output (as I assume from this) then say that.