These functions are used to obtain Objective-C runtime data types such as selectors and class objects. NSLog and NSLogv are used to print information to the standard output of an application.
Class NSClassFromString(NSString *aClassName)
const char *NSGetSizeAndAlignment(const char *typePtr, unsigned int *sizep, unsigned int *alignp)
void NSLog(NSString *format, ...)
void NSLogv(NSString *format, va_list args)
SEL NSSelectorFromString(NSString *aSelectorName)
NSString *NSStringFromClass(Class aClass)
NSString *NSStringFromSelector(SEL aSelector)