Is it possible to NSLog() without the time and date stamps, and the automatic newline? [duplicate]

Answer 1

Define a macro

#if __has_feature(objc_arc)
  #define DLog(format, ...) CFShow((__bridge CFStringRef)[NSString stringWithFormat:format, ## __VA_ARGS__]);
#else
  #define DLog(format, ...) CFShow([NSString stringWithFormat:format, ## __VA_ARGS__]);
#endif

And use this macro in you code like

NSLog(@"Content with time stamp");
DLog(@"Content without time stamp");

Here is the output of console

NSLog->2014-01-28 10:43:17.873 TestApp[452:60b] Content with time stamp
DLog -> Content without time stamp

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P.S.

If anyone wants Custom Logs which gives you more info like method name / line number etc. can download the open source MLog.h on GitHub.

Answer 2

It bothered me too, so I wrote a function to replace NSLog() and printf():

void IFPrint (NSString *format, ...) {
    va_list args;
    va_start(args, format);

    fputs([[[[NSString alloc] initWithFormat:format arguments:args] autorelease] UTF8String], stdout);

    va_end(args);
}

Then, you can just use it instead of NSLog() (e.g. IFPrint(@"Current date: %@", [NSDate date])), but it won't print out any timestamps or a newline, and you don't have to mess around with C strings and arrays, and whatnot. It's pretty handy, I'd say.

If you want, check out my full code (I've also written a replacement for fprintf, scanf, and fscanf) here.
(There's also an SO topic about it here).

Answer 3

This code will work

#ifdef DEBUG
    #define NSLog(FORMAT, ...) fprintf(stderr,"%s\n", [[NSString stringWithFormat:FORMAT, ##__VA_ARGS__] UTF8String]);
#else
    #define NSLog(...) {}
#endif

Answer 4

I like the Itai's solution. I just modified the code to use CFShow under ARC environment.

void CFLog(NSString *format, ...)
{
    va_list args;
    va_start(args, format);

    CFShow((__bridge CFStringRef)[[NSString alloc] initWithFormat:format arguments:args]);

    va_end(args);
}

Answer 5

the FIRST thing I do on ANY project is drop in (my condensed version of) this class... which gets rid of ALL the NONSENSE in NSLog… Place this at the top of an .m file - and your console output will be PERFECT.

#import <Foundation/Foundation.h>
#import <stdio.h>
#define MLogString(s,...) \
    [MLog logFile:__FILE__ lineNumber:__LINE__ \
        format:(s),##__VA_ARGS__]
@interface MLog : NSObject { }
+ (void) logFile:  (char*) sourceFile lineNumber: (int) lineNumber format: (NSString*) format, ...;
+ (void) setLogOn: (BOOL)  logOn;
@end
#ifndef NDEBUG
extern void _NSSetLogCStringFunction(void (*)(const char *string, unsigned length, BOOL withSyslogBanner));
static void PrintNSLogMessage(const char *string, unsigned length, BOOL withSyslogBanner){ puts(string); }
static void HackNSLog(void) __attribute__((constructor));
static void HackNSLog(void){ _NSSetLogCStringFunction(PrintNSLogMessage); }
#endif
static BOOL __MLogOn = NO;
@implementation MLog
+ (void) initialize { char * env = getenv("MLogOn");
     if (strcmp(env == NULL ? "" : env, "NO") != 0) __MLogOn = YES;
}
+ (void) logFile: (char *) sourceFile lineNumber: (int) lineNumber format: (NSString *) format, ...; {
    va_list ap;    NSString *print, *file;
    if (__MLogOn == NO) return;   va_start(ap, format);
    file  = [[NSString alloc] initWithBytes: sourceFile                  length:strlen(sourceFile) encoding: NSUTF8StringEncoding];
    print = [[NSString alloc] initWithFormat:format arguments: ap];
    va_end(ap); // NSLog handles synchronization issues
    NSLog(@"%s: %d %@", [[file lastPathComponent] UTF8String], lineNumber, print); return;
}
+ (void) setLogOn: (BOOL) logOn { __MLogOn = logOn; }
@end

Answer 6

Use printf() instead of NSLog()