I'm doing a presentation on debugging in Xcode and would like to get more information on using NSLog efficiently.
In particular, I have two questions:
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.
My answer to this question might help, looks like it's similar to the one Diederik cooked up. You may also want to replace the call to NSLog() with a static instance of your own custom logging class, that way you can add a priority flag for debug/warning/error messages, send messages to a file or database as well as the console, or pretty much whatever else you can think of.
#define DEBUG_MODE
#ifdef DEBUG_MODE
#define DebugLog( s, ... ) NSLog( @"<%p %@:(%d)> %@", self,
[[NSString stringWithUTF8String:__FILE__] lastPathComponent],
__LINE__,
[NSString stringWithFormat:(s),
##__VA_ARGS__] )
#else
#define DebugLog( s, ... )
#endif