CLLocation is not nil but trying to print it out throws EXC_BAD_ACCESS

Question

Sorry, this may be a noob question but I'm working with CoreLocation and this has be stumped.

I'm looking up the currentLocation using a singleton that was recommended on this site and when I get the currentLocation object, it returns true to a not nil check. However, when I try to print out its description, it throws EXC_BAD_ACCESS.

//WORKS Current location 8.6602e-290
NSLog(@"Current location %g",currLoc);

//DOESN'T WORK
NSLog(@"Current location %@",[currLoc description]);

//DOESN'T WORK - Is this causing the description to fail as well?
NSLog(@"Current location %g",currLoc.coordinate.latitude);

Why am I able to see something on the first one but not the others? BTW, this is being run on a 3.1.2 simulator Thanks.

Answer 1

currLoc.coordinate.latitude is type double... you can use %f if %g is not working

NSLog(@"Current location %f",currLoc.coordinate.latitude);

Answer 2

currLoc might be returning TRUE for not Nil check. But there may be chances of having freed object(Dangling pointer) which will pass the nil check condition. This might be you problem.

Instead of using the currLoc member directly, use Accessor for currLoc. This will fix your problem :)

Answer 3

// malformed: %g format specifier expects type
// double, you're passing an objc object.
// sending arguments through (...) with the
// invalid types/widths is a near certain way
// to crash an app, and the data will be useless
// to the function called (NSLog in this case)
NSLog(@"Current location %g",currLoc);

// try running the app with zombies enabled.
// in short, enabling zombies (NSZombiesEnabled)
// is a debugging facility to determine whether
// you use an objc object which would have been freed.
NSLog(@"Current location %@",[currLoc description]);

// as long as currLoc is a pointer to a valid (non-freed)
// objc object, then this should be fine. if it is not valid
NSLog(@"Current location %g",currLoc.coordinate.latitude);