On Jul 8, 2008, at 8:02 AM, Jon Gordon wrote:
I can't understand why I'm getting an exception when I try to use
the array operators.
Here's what I'm trying to do. One instance variable is a
NSMutableArray named "contacts". This array contains instances of
objects that have a "call" property, which is an NSString. I have
another instance variable, also an NSString, named "exCall". I want
to find out whether any contact has a call property that equals
exCall.
(It's a ham radio logging program. Yes, I know I'm a nerd, thanks.)
The following method works:
- (BOOL)callInLog
{
if (!contacts || ![contacts count] ||
![self exCall] || ![[self exCall] length])
return NO;
NSEnumerator *e = [[self contacts] objectEnumerator];
QEContact *contact;
while (nil != (contact = [e nextObject])) {
if ([[contact call] isEqual:[self exCall]])
return YES;
} // while
return NO;
} // callsignInLog
The following method throws an exception every time:
- (BOOL)callInLog
{
if (!contacts || ![contacts count] ||
![self exCall] || ![[self exCall] length])
return NO;
return ([[self valueForKey:@"[EMAIL PROTECTED]"]
containsObject:[self exCall]]);
} // callsignInLog
The message on the console is "Exception raised during posting of
notification. Ignored. exception: '[<QELogModel 0x15c3a0>
valueForUndefinedKey:]: this class is not key value coding-compliant
for the key [EMAIL PROTECTED]' invoked observer
method: '*** -[NSTextField textDidEndEditing:]' observer: 0x17a0a0
notification name: 'NSTextDidEndEditingNotification'"
valueForKey and valueForKeyPath are two different KVC accessors.
You're using valueForKey and passing a dot-separated string. People
usually use dot-separated strings as keypaths and pass them to
valueForKeyPath.
<more info than you really need to know to fix this>
It's totally legal to pass dot-separated strings to value for key, but
the NSObject built in logic won't be able to find a property or getter
method with a sig like "[EMAIL PROTECTED]". Mainly since
that's not a valid obj-c ivar or method name.
</more info than you really need to know to fix this>
use valueForKeyPath instead of valueForKey.
Shouldn't the results of the two routines be identical? If not, why
not?
(I'm running XCode v. 3.0 on a PPC machine that's running Leopard v.
10.5.4. The target SDK is Mac OS X 10.4 (Universal), with all that
entails, such as no garbage collection or ObjC 2.0.)
Thanks for any help,
-Jon
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RONZILLA
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