How to print out the method name and line number and conditionally disable NSLog?
Here are some useful macros around NSLog I use a lot:
#ifdef DEBUG# define DLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)#else# define DLog(...)#endif// ALog always displays output regardless of the DEBUG setting#define ALog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)
The DLog macro is used to only output when the DEBUG variable is set (-DDEBUG in the projects's C flags for the debug confirguration).
ALog will always output text (like the regular NSLog).
The output (e.g. ALog(@"Hello world") ) will look like this:
-[LibraryController awakeFromNib] [Line 364] Hello world
I've taken DLog
and ALog
from above, and added ULog
which raises a UIAlertView
message.
To summarize:
DLog
will output likeNSLog
only when the DEBUG variable is setALog
will always output likeNSLog
ULog
will show theUIAlertView
only when the DEBUG variable is set
#ifdef DEBUG# define DLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);#else# define DLog(...)#endif#define ALog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);#ifdef DEBUG# define ULog(fmt, ...) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"%s\n [Line %d] ", __PRETTY_FUNCTION__, __LINE__] message:[NSString stringWithFormat:fmt, ##__VA_ARGS__] delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert show]; }#else# define ULog(...)#endif
This is what it looks like:
+1 Diederik
NSLog(@"%s %d %s %s", __FILE__, __LINE__, __PRETTY_FUNCTION__, __FUNCTION__);
Outputs file name, line number, and function name:
/proj/cocoa/cdcli/cdcli.m 121 managedObjectContext managedObjectContext
__FUNCTION__
in C++ shows mangled name __PRETTY_FUNCTION__
shows nice function name, in cocoa they look the same.
I'm not sure what is the proper way of disabling NSLog, I did:
#define NSLog
And no logging output showed up, however I don't know if this has any side effects.