Re: Help with detecting invalid object when in if() test....
Re: Help with detecting invalid object when in if() test....
- Subject: Re: Help with detecting invalid object when in if() test....
- From: "Steven M.Palm" <email@hidden>
- Date: Fri, 15 Aug 2003 12:32:05 -0500
On Friday, August 15, 2003, at 11:56 AM, Alastair J.Houghton wrote:
On Friday, August 15, 2003, at 03:19 pm, Steven M.Palm wrote:
I know this sounds very basic, but I can't seem to get it right.
I have the following:
sig = [bEnd mySig];
And this doesn't always return a valid object... If I try to use the
name method on sig, [sig name], it will generate an exception if sig
is not a valid object, -[NSNull name]: selector not recognized.
Okay, I thought I would just put the code that acts on sig inside an
if statement...
if (sig) { blah }
The problem is that your -mySig method isn't returning a valid pointer
to an object.
Well, I guess I can't check this then... It's not my method, I'm
working on a bundle for Mail.App, so I can't change what gets returned.
Is there any way to determine if a value returned is proper or not?
Interesting, if I do something like:
NSLog(@"sig = %d, %@", val);
I get this, consistently, when it's bad.
sig = -1609366696, null
Yet a comparison to NULL, nil, or even [NSNull null] doesn't match.
Hmmm....
-. ----. -.-- - -.--
Steve Palm - email@hidden
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