On Jul 29, 2009, at 8:22 PM, Bill Bumgarner wrote:
On Jul 29, 2009, at 7:09 PM, DeNigris Sean wrote:
When using NSUserDefaults to get command line arguments, it doesn't
seem to handle negative numbers correctly.
In main.m:
NSUserDefaults *args = [NSUserDefaults standardUserDefaults];
int x = [args integerForKey:@"x"];
int y = [args integerForKey:@"y"];
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.
If you are writing a command line tool, you'll want to use a parsing
API that actually lets you specify arguments more completely.
man 3 getopt
That'll give you a start. But I'd recommend Dave Dribin's DDCLI
stuff; http://www.dribin.org/dave/blog/archives/2008/04/29/ddcli/
If this is a Cocoa application, you'll want to do the command line
parsing *before* NSApplicationMain() is called as it'll munch the
arguments beyond recovery IIRC.
b.bum
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