Re: Cocoa Book
Re: Cocoa Book
- Subject: Re: Cocoa Book
- From: Sherm Pendley <email@hidden>
- Date: Sun, 20 Apr 2003 23:42:32 -0400
On Sunday, April 20, 2003, at 10:32 PM, John MacMullin wrote:
I have worked my way through the O'Reilly book Cocoa Applications A
step by step guide. I have followed the directions in Chapter 11.
However, when I run the program, I get an error message:
1325 ***-[NSCFDictionarysetObject:forKey:]:attempt to insert nil value
and no window appears at all.
Could you first direct me to a list of the error codes, if there is
one, and then provide some assistance.
I can't help you with the error codes. The message basically says it
all, anyway - you're attempting to insert a nil value in a dictionary
object. The error code docs will go into painful detail about why nils
aren't allowed in dictionaries, but that wouldn't be of any help with
the important questions: What dictionary is complaining? And, where is
the nil value coming from?
Judging by the symptoms you describe - no window appears - I'd guess
that the call to initWithWindowNibName is returning nil. Further, I'd
also guess that NSDocument keeps a list of its window controllers in a
dictionary, and the call to [self addWindowController: ctl] is the
source of the error message. I tested my theory by compiling a simple
doc-based app that simply passed nil to addWindowController:, with
similar results.
You could check to see if ctl is nil by inserting an NSLog() just
before the call to addWindowController:, something like this:
if (nil == ctl) {
NSLog(@"ctl is nil");
} else {
NSLog(@"ctl is %@", [ctl description]);
}
If ctl is nil, the next step is to figure out why. The most likely cause
is a mismatch between what is returned by [self windowNibName] and the
actual name of the Nib. If you're passing a constant string to
initWithWindowNibName:, instead of calling windowNibname, there could be
a typo in that string.
I'm using 10.1, and I haven't seen your code, so take this with a grain
of salt - or as JCR would say, "adjust salinity accordingly."
sherm--
If you listen to a UNIX shell, can you hear the C?
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| References: | |
| | >Cocoa Book (From: John MacMullin <email@hidden>) |