obj in array?

Hi folks

I'm hacking on a SOAP2 solution towards Magento and have retrieved the 
catalog in an array, but i'm having trouble accessing the values of the 
array cause there's an object in it. This is a var_dump of $my_array:

array(14) {
   [0]=>
   object(stdClass)#2 (2) {
     ["set_id"]=>
     int(44)
     ["name"]=>
     string(7) "Cameras"
   }
   [1]=>
   object(stdClass)#3 (2) {
     ["set_id"]=>
     int(38)
     ["name"]=>
     string(11) "Cell Phones"
   }

how do I access for instance set_id in $my_array[0]? I tried declaring 
an instance of $my_array[0] but that fails too: "Fatal error: Cannot use 
object of type stdClass as array "

-- 
Kind regards
Kim Emax - masterminds.dk