On 11 Aug 2009, at 17:14, DeNigris Sean wrote:
If the command line is "MyApp -x -100 -y 100", NSUserDefaults
does not recognize the -100 as the value of the x argument - it
sets x to 0. If the '-' is removed, everything is fine. Is this
a bug? Is there a way around?
Yes-- -100 is parsed as an argument, not as a value to the
previous argument.
So, no, it isn't a bug. It is behaving correctly, for some values
of correct. Welcome to shell programming & the interface between
shell & process. Fragile space. Coder beware.
I consider that if a negative number is a valid value for an option,
and NSUserDefaults can not handle them, and this restriction is not
documented, then it's a bug.
So file a bug report.
Non-bug options would be:
a) handle negative arguments correctly
b) restrict numerical arguments to positive values and document this
restriction
The behavior of the object does not match the spec.
The documentation barely specifies how parsing works for command line
arguments at all. For instance, it's clearly the case that YES and NO
work for boolean arguments. But that isn't documented anywhere and it
means that if you want a string containing "YES" or "NO" you're going
to be out of luck.
So I don't think it's a case of the behaviour not matching the spec.
There *is* no spec worth mentioning, so really if there's a bug here,
it's that the docs don't say how the argument domain works.
*Anyway*, my impression has always been that NSUserDefaults was not
intended to be used to obtain the command line arguments, and that the
argument domain feature was put there primarily (though perhaps not
exclusively) for debugging purposes, as a way of temporarily
overriding the settings in the defaults database.
If you want to process the command line arguments, you can either do
so from your main() function, before calling NSApplicationMain(), or
you can use NSProcessInfo to examine them once your app is running.
Kind regards,
Alastair.
--
http://alastairs-place.net
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