gistfile1.txt

        NSString *dylibPath = @"/Users/billzhao/Desktop/libRulesActions.dylib";
        const char *libPath = [dylibPath cStringUsingEncoding:NSUTF8StringEncoding];
        void *dl = dlopen(libPath, RTLD_NOW);
        const char *dlErr = dlerror();
        if (dlErr) {
            NSLog(@"dlerror() =  %s", dlErr);
        } else {
            NSLog(@"dylib path is %s, dl = %p", libPath, dl);
        }
        
        // Get the Person class (required with runtime-loaded libraries).
        Class RulesActions_class = objc_getClass("RulesActions");
        if (!RulesActions_class) {
            NSLog(@"[%s] main: Unable to get RulesActions_class class", __FILE__);
            exit(EXIT_FAILURE);
        }
        
        // Create an instance of Person.
        NSLog(@"[%s] main: Instantiating RulesActions_class", __FILE__);
        RulesActions* person = [[RulesActions_class alloc] init];
        NSLog(@"%@", person);