CODEWITHSUNDEEP
iosnslog
Yi Jiang
Yi Jiang

Reputation: 4028

Customised NSLog generate error when I pass [<object> description] as parameter

I have followed How to NSLog into a file to create my own NSLog.

in iFob-Prefix.pch:

    #import "Log.h"
    #ifdef DEBUG_MODE
    #define NSLog( args, ... )      _Log(@"Prefixs", __FILE__, __LINE__, __PRETTY_FUNCTION__, args);
    #else
    #define NSLog( args, ... )

in Log.h 

        @interface Log : NSObject
        void _Log(NSString *prefix, const char *file, int lineNumber, const char *funcName, NSString *format,...);

        @end

in Log.m

#import "Log.h"
#import <objc/runtime.h>
#define PADDING_TABS 10

@implementation Log
void _Log(NSString *prefix, const char *file, int lineNumber, const char *funcName, NSString *format,...) {

    va_list ap;
    va_start (ap, format);
    format = [format stringByAppendingString:@"\n"];
    NSString *msg = [[NSString alloc] initWithFormat:[NSString stringWithFormat:@"%@",format]
                                           arguments:ap];

    msg = formatJsonData(msg);

    va_end (ap);
    fprintf(stderr,"\n%s[%30s:%4d] - %s",[prefix UTF8String], [[[NSString stringWithUTF8String:file] lastPathComponent]UTF8String] , lineNumber, [msg UTF8String]);
    append(msg);

}

I got error every time when I pass [<"object"> description] into the log. Like:

    NSManagedObjectContext *context = rasEngine.managedObjectContext ;
    NSLog(@"context: %@",[context description])

error: error message

Upvotes: 1

Views: 92

Answers (1)

Bryan Chen
Bryan Chen

Reputation: 46598

change NSLog( args, ... ) to NSLog( args... )

otherwise you are calling something like NSLog(@"content %@"); without pass the object

Upvotes: 1

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