Question

i have now since a while a systematic problem with NSStrings and appending these to another. I searched in the web, but i couldn’t find something witch satisfied me.

I have a string declared like this in the header and properly syntesized in the implementation:

@property (nonatomic, retain) NSString *dataString;

I am refreshing every 200 ms data. I want to put this into a string (NSData would be more nice i guess) after the old one recursive. The string should grow every 200ms then.

 dataString = [dataString stringByAppendingString:superString];


 NSLog(@"%@",dataString);

But my code is is breaking here!

LOG DATA:

2011-07-05 12:40:54.039 Acceleration[1658:307] /AccelerationApp2011-07-05_12:40.txt
2011-07-05 12:40:56.825 Acceleration[1658:307] Acceleration:
 X-axis: -0.036224 
 Y-axis: -0.036224 
 Z-axis: -0.941833 
 Global Acc: 0.9 g 
(gdb) 

…then i get program received signal: EXC_BAD_ACCESS

Is the Problem that the string may be too long?

Answer 1

You need to retain the return value from stringByAppending… or assign it to your property:

self.dataString = [self.dataString stringByAppendingString:superString];