nsargs.m

//cc -Wall -framework Foundation nsargs.m -o nsargs
/* @author Jeremy W. Sherman
 * @date 2013-08-02
 *
 * Demonstrates NSArgumentDomain.
 *
 * Try:
 *   ./nsargs -a YES -foo fishy -x 3
 *
 *   2013-08-02 19:49:35.331 nsargs[48904:707] nsargs: command-line args:
 *     a <- YES (__NSCFConstantString)
 *     foo <- fishy (__NSCFString)
 *     x <- 3 (__NSCFConstantString)
 */
#import <Foundation/Foundation.h>

int
main(void)
{
    NSDictionary *args = [[NSUserDefaults standardUserDefaults]
                          volatileDomainForName:NSArgumentDomain];
    NSMutableArray *items = [NSMutableArray new];
    for (NSString *key in args) {
        id arg = args[key];
        NSString *item = [NSString stringWithFormat:@"  %@ <- %@ (%@)",
                          key, arg, [arg class]];
        [items addObject:item];
    }
    NSString *argsAlt = [items componentsJoinedByString:@"\n"];

    /* Note how they all come through as NSStrings. */
    NSLog(@"%@: command-line args:\n%@",
          [NSProcessInfo processInfo].processName, argsAlt);
}