Question

I have some code like this:

#define FORCE_DEBUG_MODE [[[NSUserDefaults standardUserDefaults] valueForKey:@"forceDebugMode"] isEqualToString:@"1"]

#if defined DEBUG_MODE || defined FORCE_DEBUG_MODE
#define DLog( s, ... ) NSLog( @"<%p %@:(%d)> %@", self, [[NSString stringWithUTF8String:__FILE__] lastPathComponent], __LINE__, [NSString stringWithFormat:(s),  ##__VA_ARGS__] )
#else
#define DLog( s, ... ) 
#endif

I read from some article outside to use the preprocess marcos to define the DEBUG_MODE, however I would like to override the mode if I set a NSUserDefaults value to something.

These code got no errors. But seems that no matter what the FORCE_DEBUG_MODE is, defined FORCE_DEBUG_MODE equal to true. What I want is something like FORCE_DEBUG_MODE == 1

Please tell me if I can do this, and How?

Answer 1

you defined FORCE_DEBUG_MODE right above your check to see if it is defined. To check if it is true then you must just do || FORCE_DEBUG_MODE however that will as well be always true as It is only seeing if there is some value under the macro – this is all done in the preprocessor meaning none of this code will be ran or reran at runtime – these defines will define what code is actually compiled, not what code is ran