Subj : Re: nsIAddressBook getCardCount nsISupportsPRUint32 data or value
To   : Cimballi
From : Brendan Eich
Date : Wed Jun 08 2005 09:51 am

Cimballi wrote:
> Hi,
> 
> A question about the method getCardCount() in the interface nsIAddressBook.
> It needs a PRUint32 param but if I create a nsISupportsPRUint32 variable 
> and pass it to the function, there is an error which says : can't set 
> the "value" attribute.
> This is normal because the nsISupportsPRUint32 has only a "data" attribute.

Please use a better newsgroup.  For general XPCOM questions, n.p.m.xpcom 
would be better, but since this is a question specific 
(http://lxr.mozilla.org/mozilla/source/mailnews/addrbook/public/nsIAddrDatabase.idl#177) 
to a mailnews/addrbook public interface, I'll use n.p.m.mail.news.

> 
> Is this normal ? What kind of object should I pass to the function ?

Just pass an empty object, e.g.

   var hardCount = {};
   adb.getHardCount(hardCount);
   alert(hardCount.value);

> 
> Thanks,

Cc'ing bienvenu too -- David, any reason this method was not written in 
IDL as

   PRUint32 getHardCount();

?

Then XPConnect would allow the JS to look more natural:

   var hardCount = adb.getHardCount();

/be

.