Get File Size (OS X) With Error Handling

NSError *error = nil;

NSString *path = [NSString stringWithFormat:@"%@/Library/Safari/History.plist", NSHomeDirectory()];

uint64_t fileSize = [[[NSFileManager defaultManager] attributesOfItemAtPath:path error:&error] fileSize];

if (error != nil) {
    NSLog(@"Error: %@", [error localizedDescription]);
} else {
    NSLog(@"File Size: %.0llu", fileSize);
}