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PODebugging EXC_BAD_ACCESS from a NSString
 

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  1. PODebugging EXC_BAD_ACCESS from a NSString
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    <p>I had a EXC_BAD_ACCESS message in my console. I read about the environment variables NSZombieEnabled and MallocStackLoggingNoCompact on <a href="http://coderslike.us/2009/05/05/finding-freeddeallocated-instances-of-objects/" rel="noreferrer">this site</a>. I created my environment variables: <strong>NSZombieEnabled = YES</strong> and <strong>MallocStackLoggingNoCompact = 1</strong>. In the console, I saw</p> <blockquote> <p>2010-03-01 19:13:46.924 CruzNomad[7952:207] *** -[CFString stringByAddingPercentEscapesUsingEncoding:]: message sent to deallocated instance 0x58448e0</p> </blockquote> <p>Then at the (gdb) prompt, I did <strong>info malloc-history 0x58448e0</strong>, which gave me:</p> <pre><code>Alloc: Block address: 0x058448e0 length: 64 Stack - pthread: 0xa0b33500 number of frames: 25 0: 0x98e089bc in malloc_zone_malloc 1: 0x21516aa in _CFRuntimeCreateInstance 2: 0x2152bf8 in __CFStringCreateImmutableFunnel3 3: 0x21567d9 in CFStringCreateCopy 4: 0x21742fc in _CFStringCreateWithFormatAndArgumentsAux 5: 0xdb546 in -[NSPlaceholderString initWithFormat:locale:arguments:] 6: 0xdb4d8 in +[NSString stringWithFormat:] 7: 0x23aa3 in -[BuisnessCardViewController viewDidLoad] at /Users/.../Classes/BuisnessCardViewController.m:85 8: 0x3d6796 in -[UIViewController view] 9: 0x347b4 in -[gm_menuViewController btn5_Pressed:] at /Users/.../Classes/menuViewController.m:535 10: 0x357459 in -[UIApplication sendAction:to:from:forEvent:] 11: 0x3baba2 in -[UIControl sendAction:to:forEvent:] 12: 0x3bcdc3 in -[UIControl(Internal) _sendActionsForEvents:withEvent:] 13: 0x3bbb0f in -[UIControl touchesEnded:withEvent:] 14: 0x370e33 in -[UIWindow _sendTouchesForEvent:] 15: 0x35a81c in -[UIApplication sendEvent:] 16: 0x3610b5 in _UIApplicationHandleEvent 17: 0x2984ed1 in PurpleEventCallback 18: 0x2197b80 in CFRunLoopRunSpecific 19: 0x2196c48 in CFRunLoopRunInMode 20: 0x298378d in GSEventRunModal 21: 0x2983852 in GSEventRun 22: 0x362003 in UIApplicationMain 23: 0x2c8c in main at /Users/.../source/main.m:14 24: 0x2bfa in start </code></pre> <p>Line 7 says the problem was in line 85 of BuisnessCardViewController.m. That line is here:</p> <pre><code>fullAddress = [NSString stringWithFormat:@"%@ %@", fullAddress, myString]; </code></pre> <p>I'm appending the contents of <strong>fullAddress</strong> and <strong>myString</strong> and storing it back in <strong>fullAddress</strong>.</p> <p>If I'm interpreting this correctly, it appears that after this line, <strong>fullAddress</strong> is deallocated. When I drop a breakpoint and hover over the variable, its value says "out of scope."</p> <p><strong>fullAddress</strong> works later in this method. I use it to send to send to Google for reverse geocoding in line 164 of the same method.</p> <pre><code>NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&amp;output=csv", [fullAddress stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; </code></pre> <p>Even here, it says "out of scope." I'm stumped...any advice??</p> <p>Thanks!</p> <p>Thomas</p>
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    1. COCan you post a bit more context? If it says the variable went out of scope, can we see the whole scope?
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    2. COAre you using `fullAddress` or `myString` anywhere else?
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    3. COAlso, just in case it was an accident, you've misspelled Business as Buisness.
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      1. USdreamlax
 

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