Objective-C Logging

DebugLog.h

// Source: http://blog.mbcharbonneau.com/post/56581688/better-logging-in-objective-c
#define DebugLog(format, ...) NSLog(@"<%p %@:(%d)> %@", self, [[NSString stringWithUTF8String:__FILE__] lastPathComponent], __LINE__, [NSString stringWithFormat:(format), ##__VA_ARGS__])

JJLogging.h

// In Leopard, NSLog logs to console.log unconditionally...
// Source: http://lapcatsoftware.com/blog/2008/01/06/logging-in-leopard/
#ifdef __OBJC__
	#import <Cocoa/Cocoa.h>
	#ifdef JJLOGGING
		#define JJLog(...) (void)printf("%s:%i %s: %s\n", __FILE__, __LINE__, __PRETTY_FUNCTION__, [[NSString stringWithFormat:__VA_ARGS__] UTF8String])
	#else
		#define JJLog(...)
	#endif
#endif

LogSelector.m

- (BOOL)respondsToSelector:(SEL)theSelector
{
	NSLog(@"Asked if I respond to %@", NSStringFromSelector(theSelector));
}

NSLog.m

// Log the current function's signature
NSLog(@"%s", __PRETTY_FUNCTION__);

NSXLog.h

@interface NSXLogger : NSObject
{
}

+ (void)logFile:(char *)sourceFile lineNumber:(int)lineNumber format:(NSString*)format, ...;
+ (void)setLogOn:(BOOL)logOn;
@end

#define NSXLog(string, ...) \
	[NSXLogger logFile:__FILE__ lineNumber:__LINE__ format:(string), ##__VA_ARGS__]

NSXLog.m

static BOOL __NSXLogOn = NO;

@implementation NSXLogger

+ (void)initialize
{
	char *env = getenv("NSXLogOn");
	if (strcmp(env == NULL ? "" : env, "NO") != 0)
		__NSXLogOn = YES;
}

+ (void)logFile:(char *)sourceFile lineNumber:(int)lineNumber format:(NSString*)format, ...;
{
	va_list ap;
	if (__NSXLogOn == NO)
		return;
	va_start(ap, format);
	NSString *file = [[NSString alloc] initWithBytes:sourceFile length:strlen(sourceFile) encoding:NSUTF8StringEncoding];
	NSString *print = [[NSString alloc] initWithFormat:format arguments:ap];
	va_end(ap);
	// NSLog handles synchronization issues
	NSLog(@"%s:%d %@", [[file lastPathComponent] UTF8String], lineNumber, print);
	[print release];
	[file release];
}

+ (void)setLogOn:(BOOL)logOn
{
	__NSXLogOn = logOn;
}

@end

UKLog.h

// Source: http://zathras.de/angelweb/blog-uk-helper-macros.htm
#define	UKLog(args...) NSLog(@"%s: %@", __PRETTY_FUNCTION__, [NSString stringWithFormat: args])
// Alternatively:
#define	UKLog(format, ...) NSLog(@"%s: %@", __PRETTY_FUNCTION__, [NSString stringWithFormat: format, ##__VA_ARGS__])

ZNLog.m

// Source: http://tonyarnold.com/projects/znlog/

#import <Cocoa/Cocoa.h>

@interface ZNLog : NSObject {}

+(void)file:(char*)sourceFile function:(char*)functionName lineNumber:(int)lineNumber format:(NSString*)format, ...;

#define ZNLog(s,...) [ZNLog file:__FILE__ function: (char *)__FUNCTION__ lineNumber:__LINE__ format:(s),##__VA_ARGS__]

@end

@implementation ZNLog

+ (void)file:(char*)sourceFile function:(char*)functionName lineNumber:(int)lineNumber format:(NSString*)format, ...
{
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  va_list ap;
  NSString *print, *file, *function;
  va_start(ap,format);
  file = [[NSString alloc] initWithBytes: sourceFile length: strlen(sourceFile) encoding: NSUTF8StringEncoding];

  function = [NSString stringWithCString: functionName];
  print = [[NSString alloc] initWithFormat: format arguments: ap];
  va_end(ap);
  NSLog(@"%@:%d %@; %@", [file lastPathComponent], lineNumber, function, print);
  [print release];
  [file release];
  [pool release];
}

@end