PECL PDO on WIN32. Problems with PDO_PARAM* constants

[Leonardo Javier Belén <lbelen@xxxxxxxxxxx>]

Dear all, 
    I am not able to get the value of the PDO_PARAM*  constants. Instead of the value I get the plain string. 
I am using PHP 5.0.5 on Win2000 with APACHE, and the php_pdo.dll from the pecl.php.net. 
I searched on the mailing lists and the php documentation but noone seems to have faced the same problem, so I am lost. 

Thanks in advance.