check a NULL value

[minus]

Hi everybody !

I have a NSData : attachment, I have to check if his value is NULL.

When I done :

NSLog(@"%@", attachment)

I have :

(null)

I tried :

if( (NSNull*) attachment == [NSNull null]) {
...
}

but it doesn't work. How can I check if my value is null ?

[Kalimba]

if ( attachment == nil )
{
    // attachment is nil, NULL, 0, nada, zilch, etc.
}

[csheldrick]

if(attachment){
// code if it's not null
} 
if(!attachment){
// code if it is null
}