Different int values or the same? EXC_BAD_ACCESS at NSLog

Question

I have this code:

likeButton.tag = spik._id;
NSLog(@"spik ID=%@   likebtn.tag=%@",spik._id,likeButton.tag);
NSLog(@"%@", likeButton);

where spik._id is NSInteger

And this is the output:

2012-03-11 19:35:37.751 KwikSpik[44277:ce03] spik ID=39975   likebtn.tag=39975   
2012-03-11 19:35:37.752 KwikSpik[44277:ce03] <<UIButton: 0xd178b60; frame = (20 12604; 30 30); opaque = NO; tag = 90793136; layer = <CALayer: 0xd1788d0>>

You see that likeButton.tag = 39975 here but when I log the button, its tag is 90793136.

if I write NSLog(@"spik ID=%@ likebtn.tag=%d",spik._id,likeButton.tag);

then I get

012-03-11 23:27:38.290 KwikSpik[45326:ce03] spik ID=39975 likebtn.tag=87582784

Are these different presentations of one number or different values? Why are these values different?

Later if I write

NSLog(@"tag d %d",sender.tag);
NSLog(@"tag @ %@",sender.tag);

where sender is likeButton then first NSLog outputs 87582784 and second crashes with EXC_BAD_ACCESS (code = 1, address = 0x30...)

What's happening? Why there're different values in likeButton.tag and spik._id - or they just look like different?

Why NSLog first time outputted likeButton.tag with %@ and the second time it crashed?

score 1 · Answer 1 · edited Mar 11 '12 at 16:24

1

NSLog(@"spik ID=%@ likebtn.tag=%d", spik._id, likeButton.tag);

When you log your button, tag is not considered as an int.

edited Mar 11 '12 at 16:24

Lorenzo B

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answered Mar 11 '12 at 14:54

janusfidel

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Yes, `tag` is not an object; it's a plain vanilla C integer. (`NSInteger` is a typedef for `int` or `long` depending on architecture.) – Wevah Mar 11 '12 at 15:01
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However real value is 39975 (or like this), not like 90793136. I don't need this long strange numbers. – Ilya Blokh Mar 11 '12 at 15:05
@Wevah spik._id is NSInteger too. But why they are different in log? – Eugene Trapeznikov Mar 11 '12 at 15:07
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If it's an NSInteger, then you should be using %ld. – Wevah Mar 11 '12 at 16:23
NSLog("button tag == %d", likeButton.tag); – janusfidel Mar 11 '12 at 16:31
And what?Values still different despite `likeButton.tag = spik._id;` – Ilya Blokh Mar 11 '12 at 18:31

score 1 · Answer 2 · answered Mar 11 '12 at 16:56

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They are being interpreted differently by NSLog as you used %@. Use %d to output as an integer.

NSLog(@"spik ID=%d   likebtn.tag=%d", spik._id,likeButton.tag);

answered Mar 11 '12 at 16:56

Thomas Nadin

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If I log by this way, output values still different. Why? I equated variables – Ilya Blokh Mar 11 '12 at 18:32

Different int values or the same? EXC_BAD_ACCESS at NSLog

2 Answers2