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Saving NSDictionary, Enumeration error
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Saving NSDictionary, Enumeration error


  • Subject: Saving NSDictionary, Enumeration error
  • From: Tamas Nagy <email@hidden>
  • Date: Tue, 07 May 2013 14:39:58 +0200

Hi,

one of my users recently got an error when trying to save. My application is not document based, and I'm collecting the data to NSDictionaries, then save it with writeToFile: method. I never can reproduce the issue, so hard to find what is the problem.

I'm collection the data with methods like:

    NSMutableDictionary *tempdict = [[[NSMutableDictionary alloc] init] autorelease];

    [tempdict setObject:... forKey:...];
    [tempdict setObject:... forKey:...];
    [tempdict setObject:... forKey:...];
    	.
	.
	.
    return [NSDictionary dictionaryWithDictionary:tempdict];

and putting those NSDictionaries to realSaveDict, then save:
[realSaveDict writeToFile:[sPanel filename] atomically:YES]

Any ideas guys what's going wrong?

Thanks,

Tamas

May 3, 2013 2:44:54 PM: *** Collection <__NSDictionaryM: 0x1c37a300> was mutated while being enumerated.
May 3, 2013 2:44:54 PM: (
	0   CoreFoundation                      0x98912e9b __raiseError + 219
	1   libobjc.A.dylib                     0x970b352e objc_exception_throw + 230
	2   CoreFoundation                      0x98912a9a __NSFastEnumerationMutationHandler + 282
	3   CoreFoundation                      0x9884afc9 -[__NSFastEnumerationEnumerator nextObject] + 457
	4   CoreFoundation                      0x98884f4c -[NSDictionary countByEnumeratingWithState:objects:count:] + 396
	5   CoreFoundation                      0x98884c68 -[NSDictionary __apply:context:] + 104
	6   CoreFoundation                      0x9880904a CFDictionaryApplyFunction + 106
	7   CoreFoundation                      0x98809dbe __CFPropertyListIsValidAux + 366
	8   CoreFoundation                      0x9882aac1 __CFPropertyListIsDictPlistAux + 257
	9   CoreFoundation                      0x98884cd5 -[NSDictionary __apply:context:] + 213
	10  CoreFoundation                      0x9880904a CFDictionaryApplyFunction + 106
	11  CoreFoundation                      0x98809dbe __CFPropertyListIsValidAux + 366
	12  CoreFoundation                      0x9882aac1 __CFPropertyListIsDictPlistAux + 257
	13  CoreFoundation                      0x98884cd5 -[NSDictionary __apply:context:] + 213
	14  CoreFoundation                      0x9880904a CFDictionaryApplyFunction + 106
	15  CoreFoundation                      0x98809dbe __CFPropertyListIsValidAux + 366
	16  CoreFoundation                      0x9882aac1 __CFPropertyListIsDictPlistAux + 257
	17  CoreFoundation                      0x98884cd5 -[NSDictionary __apply:context:] + 213
	18  CoreFoundation                      0x9880904a CFDictionaryApplyFunction + 106
	19  CoreFoundation                      0x98809dbe __CFPropertyListIsValidAux + 366
	20  CoreFoundation                      0x9882aac1 __CFPropertyListIsDictPlistAux + 257
	21  CoreFoundation                      0x98884cd5 -[NSDictionary __apply:context:] + 213
	22  CoreFoundation                      0x9880904a CFDictionaryApplyFunction + 106
	23  CoreFoundation                      0x98809dbe __CFPropertyListIsValidAux + 366
	24  CoreFoundation                      0x9883c445 CFPropertyListIsValid + 117
	25  CoreFoundation                      0x9883c2dd _CFPropertyListCreateXMLData + 77
	26  CoreFoundation                      0x9883c280 CFPropertyListCreateXMLData + 32
	27  Foundation                          0x98ca14ae -[NSDictionary(NSDictionary) writeToURL:atomically:] + 242

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