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Network location question

How can I detect when the network location has been changed? I figure it is something to do with the System Configuration framework, but I can't find much documentation on it.

What I want to do is write a program to be able detect network location changes and then run a script when this occurs.

This is the direction I'm going now (which doesn't work):

#import <Foundation/Foundation.h>
#import <SystemConfiguration/SystemConfiguration.h>

void sc_callback(SCPreferencesRef prefs,
                 SCPreferencesNotification notificationType,
                 void *info)
{
    NSLog(@"callback called!");
}

int main (int argc, const char * argv[])
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    SCPreferencesRef scpref = NULL;
    SCPreferencesContext prefcontext;
    CFRunLoopRef rlref = NULL;

    bzero(&prefcontext,sizeof(SCPreferencesContext));

scpref = SCPreferencesCreate(NULL,CFSTR("TEST"),CFSTR("Setup:/ Network/Global/IPv4"));
SCPreferencesSetCallback(scpref,sc_callback,&prefcontext);

    rlref = [[NSRunLoop currentRunLoop] getCFRunLoop];

SCPreferencesScheduleWithRunLoop (scpref,rlref,kCFRunLoopDefaultMode);
[[NSRunLoop currentRunLoop] run];

    if (scpref != NULL)
    {
        CFRelease(scpref);
        scpref = NULL;
    }

    [pool release];
    return 0;
}

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