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• NSOperationQueue bug with dependencies

  - by Daniel

  I am using NSOperation and NSOperationQueue for performing a sequence of operations, all dependent on each other (2 on 1, 3 on 2, etc...). I set the dependency after I create the operations. I am encountering problems when the queue completes: the program crashes in the _release part of the code, apparently when the NSOperations are getting released. Note that they all get released at the end by the queue, because it is only after the very last one which depends on the second last one, which depends on etc... that they can be released. If I remove any dependency, the code runs fine. If I change waitUntilFinished: to NO, it crashes, if it is YES, it does not. I have isolated the problem to the following code which does not use any of my custom classes. NSOperation by default is a class that does absolutely nothing. Yet, this still crashes when all operations have completed. Therefore, it appears I am not using NSOperationQueue properly but can't see what is wrong. I am running on 10.9 and I have noticed that in general Maverick 10.9 is much more sensitive to these issues than 10.8. I call this method from the main Thread with a Menu item: - (void) testOperations:(id)object { NSOperationQueue* queue = [ [ NSOperationQueue alloc ] init ]; NSMutableArray* array = [ NSMutableArray array ]; for ( int i = 0; i < 10000; i++) [ array addObject: [[[ NSOperation alloc ] init ] autorelease ] ]; for ( int i = 1; i < [ array count ]; i++) [[ array objectAtIndex:i ] addDependency:[array objectAtIndex:i-1]]; // remove this and no crash [ queue addOperations: array waitUntilFinished:NO ]; // Change to YES, no crash [ queue autorelease ]; // or release, it does not make a difference, in fact leaking the memory makes no difference: the code crashes when the queue is removing the NSOperations } This will crash every single time with: bool objc::DenseMapBase , objc_object*, unsigned long, objc::DenseMapInfo, true: (EXC_BAD_ACCESS) The full stack is: #0 0x9104d81b in objc::DenseMapBase<objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*> >, objc_object*, unsigned long, objc::DenseMapInfo<objc_object*>, true>::find(objc_object* const&) () #1 0x910384e3 in _objc_rootReleaseWasZero () #2 0x9104d5d9 in -[NSObject release] () #3 0x99e41224 in CFRelease () #4 0x99e56277 in -[__NSArrayM dealloc] () #5 0x9104d5ef in -[NSObject release] () #6 0x97f62b22 in -[__NSOperationInternal dealloc] () #7 0x9104d5ef in -[NSObject release] () #8 0x97f62ac8 in -[NSOperation dealloc] () #9 0x9104d5ef in -[NSObject release] () #10 0x99e41224 in CFRelease () #11 0x99e56277 in -[__NSArrayM dealloc] () #12 0x9104d5ef in -[NSObject release] () #13 0x97f62b22 in -[__NSOperationInternal dealloc] () #14 0x9104d5ef in -[NSObject release] () #15 0x97f62ac8 in -[NSOperation dealloc] () #16 0x9104d5ef in -[NSObject release] () #17 0x99e41224 in CFRelease () #18 0x99e56277 in -[__NSArrayM dealloc] () #19 0x9104d5ef in -[NSObject release] () #20 0x97f62b22 in -[__NSOperationInternal dealloc] () #21 0x9104d5ef in -[NSObject release] () #22 0x97f62ac8 in -[NSOperation dealloc] () #23 0x9104d5ef in -[NSObject release] () #24 0x99e41224 in CFRelease () #25 0x99e56277 in -[__NSArrayM dealloc] () #26 0x9104d5ef in -[NSObject release] () #27 0x97f62b22 in -[__NSOperationInternal dealloc] () #28 0x9104d5ef in -[NSObject release] () #29 0x97f62ac8 in -[NSOperation dealloc] () #30 0x9104d5ef in -[NSObject release] () #31 0x99e41224 in CFRelease () #32 0x99e56277 in -[__NSArrayM dealloc] () #33 0x9104d5ef in -[NSObject release] () #34 0x97f62b22 in -[__NSOperationInternal dealloc] () #35 0x9104d5ef in -[NSObject release] () #36 0x97f62ac8 in -[NSOperation dealloc] () #37 0x9104d5ef in -[NSObject release] () #38 0x99e41224 in CFRelease () #39 0x99e56277 in -[__NSArrayM dealloc] () #40 0x9104d5ef in -[NSObject release] () #41 0x97f62b22 in -[__NSOperationInternal dealloc] () #42 0x9104d5ef in -[NSObject release] () #43 0x97f62ac8 in -[NSOperation dealloc] () #44 0x9104d5ef in -[NSObject release] () #45 0x99e41224 in CFRelease () #46 0x99e56277 in -[__NSArrayM dealloc] () #47 0x9104d5ef in -[NSObject release] () #48 0x97f62b22 in -[__NSOperationInternal dealloc] () #49 0x9104d5ef in -[NSObject release] () #50 0x97f62ac8 in -[NSOperation dealloc] () #10722 0x9104d5ef in -[NSObject release] () #10723 0x97f62b22 in -[__NSOperationInternal dealloc] () #10724 0x9104d5ef in -[NSObject release] () #10725 0x97f62ac8 in -[NSOperation dealloc] () #10726 0x9104d5ef in -[NSObject release] () #10727 0x99e41224 in CFRelease () #10728 0x99e56277 in -[__NSArrayM dealloc] () #10729 0x9104d5ef in -[NSObject release] () #10730 0x97f62b22 in -[__NSOperationInternal dealloc] () #10731 0x9104d5ef in -[NSObject release] () #10732 0x97f62ac8 in -[NSOperation dealloc] () #10733 0x9104d5ef in -[NSObject release] () #10734 0x99e41224 in CFRelease () #10735 0x99e56277 in -[__NSArrayM dealloc] () #10736 0x9104d5ef in -[NSObject release] () #10737 0x97f62b22 in -[__NSOperationInternal dealloc] () #10738 0x9104d5ef in -[NSObject release] () #10739 0x97f62ac8 in -[NSOperation dealloc] () #10740 0x9104d5ef in -[NSObject release] () #10741 0x99e41224 in CFRelease () #10742 0x99e56277 in -[__NSArrayM dealloc] () #10743 0x9104d5ef in -[NSObject release] () #10744 0x97f62b22 in -[__NSOperationInternal dealloc] () #10745 0x9104d5ef in -[NSObject release] () #10746 0x97f62ac8 in -[NSOperation dealloc] () #10747 0x9104d5ef in -[NSObject release] () #10748 0x99e41224 in CFRelease () #10749 0x99e56277 in -[__NSArrayM dealloc] () #10750 0x9104d5ef in -[NSObject release] () #10751 0x97f62b22 in -[__NSOperationInternal dealloc] () #10752 0x9104d5ef in -[NSObject release] () #10753 0x97f62ac8 in -[NSOperation dealloc] () #10754 0x9104d5ef in -[NSObject release] () #10755 0x99e41224 in CFRelease () #10756 0x99e56277 in -[__NSArrayM dealloc] () #10757 0x9104d5ef in -[NSObject release] () #10758 0x97f62b22 in -[__NSOperationInternal dealloc] () #10759 0x9104d5ef in -[NSObject release] () #10760 0x97f62ac8 in -[NSOperation dealloc] () #10761 0x9104d5ef in -[NSObject release] () #10762 0x99e41224 in CFRelease () #10763 0x99e56277 in -[__NSArrayM dealloc] () #10764 0x9104d5ef in -[NSObject release] () #10765 0x97f62b22 in -[__NSOperationInternal dealloc] () #10766 0x9104d5ef in -[NSObject release] () #10767 0x97f62ac8 in -[NSOperation dealloc] () #10768 0x9104d5ef in -[NSObject release] () #10769 0x99e41224 in CFRelease () #10770 0x99e56277 in -[__NSArrayM dealloc] () #10771 0x9104d5ef in -[NSObject release] () #10772 0x97f62b22 in -[__NSOperationInternal dealloc] () #10773 0x9104d5ef in -[NSObject release] () #10774 0x97f62ac8 in -[NSOperation dealloc] () #10775 0x9104d5ef in -[NSObject release] () #10776 0x99e41224 in CFRelease () #10777 0x99e56277 in -[__NSArrayM dealloc] () #10778 0x9104d5ef in -[NSObject release] () #10779 0x97f62b22 in -[__NSOperationInternal dealloc] () #10780 0x9104d5ef in -[NSObject release] () #10781 0x97f62ac8 in -[NSOperation dealloc] () #10782 0x9104d5ef in -[NSObject release] () #10783 0x99e41224 in CFRelease () #10784 0x99e56277 in -[__NSArrayM dealloc] () #10785 0x9104d5ef in -[NSObject release] () #10786 0x97f62b22 in -[__NSOperationInternal dealloc] () #10787 0x9104d5ef in -[NSObject release] () #10788 0x97f62ac8 in -[NSOperation dealloc] () #10789 0x9104d5ef in -[NSObject release] () #10790 0x99e41224 in CFRelease () #10791 0x99e56277 in -[__NSArrayM dealloc] () #10792 0x9104d5ef in -[NSObject release] () #10793 0x97f62b22 in -[__NSOperationInternal dealloc] () #10794 0x9104d5ef in -[NSObject release] () #10795 0x97f62ac8 in -[NSOperation dealloc] () #10796 0x9104d5ef in -[NSObject release] () #10797 0x99e41224 in CFRelease () #10798 0x99e56277 in -[__NSArrayM dealloc] () #10799 0x9104d5ef in -[NSObject release] () #10800 0x97f62b22 in -[__NSOperationInternal dealloc] () #10801 0x9104d5ef in -[NSObject release] () #10802 0x97f62ac8 in -[NSOperation dealloc] () #10803 0x9104d5ef in -[NSObject release] () #10804 0x99e41224 in CFRelease () #10805 0x99e56277 in -[__NSArrayM dealloc] () #10806 0x9104d5ef in -[NSObject release] () #10807 0x97f62b22 in -[__NSOperationInternal dealloc] () #10808 0x9104d5ef in -[NSObject release] () #10809 0x97f62ac8 in -[NSOperation dealloc] () #10810 0x9104d5ef in -[NSObject release] () #10811 0x99e41224 in CFRelease () #10812 0x99e56277 in -[__NSArrayM dealloc] () #10813 0x9104d5ef in -[NSObject release] () #10814 0x97f62b22 in -[__NSOperationInternal dealloc] () #10815 0x9104d5ef in -[NSObject release] () #10816 0x97f62ac8 in -[NSOperation dealloc] () #10817 0x9104d5ef in -[NSObject release] () #10818 0x99e41224 in CFRelease () #10819 0x99e56277 in -[__NSArrayM dealloc] () #10820 0x9104d5ef in -[NSObject release] () #10821 0x97f62b22 in -[__NSOperationInternal dealloc] () #10822 0x9104d5ef in -[NSObject release] () #10823 0x97f62ac8 in -[NSOperation dealloc] () #10824 0x9104d5ef in -[NSObject release] () #10825 0x99e41224 in CFRelease () #10826 0x99e56277 in -[__NSArrayM dealloc] () #10827 0x9104d5ef in -[NSObject release] () #10828 0x97f62b22 in -[__NSOperationInternal dealloc] () #10829 0x9104d5ef in -[NSObject release] () #10830 0x97f62ac8 in -[NSOperation dealloc] () #10831 0x9104d5ef in -[NSObject release] () #10832 0x99e41224 in CFRelease () #10833 0x99e56277 in -[__NSArrayM dealloc] () #10834 0x9104d5ef in -[NSObject release] () #10835 0x97f62b22 in -[__NSOperationInternal dealloc] () #10836 0x9104d5ef in -[NSObject release] () #10837 0x97f62ac8 in -[NSOperation dealloc] () #10838 0x9104d5ef in -[NSObject release] () #10839 0x99e41224 in CFRelease () #10840 0x99e56277 in -[__NSArrayM dealloc] () #10841 0x9104d5ef in -[NSObject release] () #10842 0x97f62b22 in -[__NSOperationInternal dealloc] () #10843 0x9104d5ef in -[NSObject release] () #10844 0x97f62ac8 in -[NSOperation dealloc] () #10845 0x9104d5ef in -[NSObject release] () #10846 0x99e41224 in CFRelease () #10847 0x99e56277 in -[__NSArrayM dealloc] () #10848 0x9104d5ef in -[NSObject release] () #10849 0x97f62b22 in -[__NSOperationInternal dealloc] () #10850 0x9104d5ef in -[NSObject release] () #10851 0x97f62ac8 in -[NSOperation dealloc] () #10852 0x9104d5ef in -[NSObject release] () #10853 0x99e41224 in CFRelease () #10854 0x99e56277 in -[__NSArrayM dealloc] () #10855 0x9104d5ef in -[NSObject release] () #10856 0x97f62b22 in -[__NSOperationInternal dealloc] () #10857 0x9104d5ef in -[NSObject release] () #10858 0x97f62ac8 in -[NSOperation dealloc] () #10859 0x9104d5ef in -[NSObject release] () #10860 0x99e41224 in CFRelease () #10861 0x99e56277 in -[__NSArrayM dealloc] () #10862 0x9104d5ef in -[NSObject release] () #10863 0x97f62b22 in -[__NSOperationInternal dealloc] () #10864 0x9104d5ef in -[NSObject release] () #10865 0x97f62ac8 in -[NSOperation dealloc] () #10866 0x9104d5ef in -[NSObject release] () #10867 0x99e41224 in CFRelease () #10868 0x99e56277 in -[__NSArrayM dealloc] () #10869 0x9104d5ef in -[NSObject release] () #10870 0x97f62b22 in -[__NSOperationInternal dealloc] () #10871 0x9104d5ef in -[NSObject release] () #10872 0x97f62ac8 in -[NSOperation dealloc] () #10873 0x9104d5ef in -[NSObject release] () #10874 0x99e41224 in CFRelease () #10875 0x99e56277 in -[__NSArrayM dealloc] () #10876 0x9104d5ef in -[NSObject release] () #10877 0x97f62b22 in -[__NSOperationInternal dealloc] () #10878 0x9104d5ef in -[NSObject release] () #10879 0x97f62ac8 in -[NSOperation dealloc] () #10880 0x9104d5ef in -[NSObject release] () #10881 0x99e41224 in CFRelease () #10882 0x99e56277 in -[__NSArrayM dealloc] () #10883 0x9104d5ef in -[NSObject release] () #10884 0x97f62b22 in -[__NSOperationInternal dealloc] () #10885 0x9104d5ef in -[NSObject release] () #10886 0x97f62ac8 in -[NSOperation dealloc] () #10887 0x9104d5ef in -[NSObject release] () #10888 0x99e41224 in CFRelease () #10889 0x99e56277 in -[__NSArrayM dealloc] () #10890 0x9104d5ef in -[NSObject release] () #10891 0x97f62b22 in -[__NSOperationInternal dealloc] () #10892 0x9104d5ef in -[NSObject release] () #10893 0x97f62ac8 in -[NSOperation dealloc] () #10894 0x9104d5ef in -[NSObject release] () #10895 0x99e41224 in CFRelease () #10896 0x99e56277 in -[__NSArrayM dealloc] () #10897 0x9104d5ef in -[NSObject release] () #10898 0x97f62b22 in -[__NSOperationInternal dealloc] () #10899 0x9104d5ef in -[NSObject release] () #10900 0x97f62ac8 in -[NSOperation dealloc] () #10901 0x9104d5ef in -[NSObject release] () #10902 0x99e41224 in CFRelease () #10903 0x99e56277 in -[__NSArrayM dealloc] () #10904 0x9104d5ef in -[NSObject release] () #10905 0x97f62b22 in -[__NSOperationInternal dealloc] () #10906 0x9104d5ef in -[NSObject release] () #10907 0x97f62ac8 in -[NSOperation dealloc] () #10908 0x9104d5ef in -[NSObject release] () #10909 0x99e41224 in CFRelease () #10910 0x99e56277 in -[__NSArrayM dealloc] () #10911 0x9104d5ef in -[NSObject release] () #10912 0x97f62b22 in -[__NSOperationInternal dealloc] () #10913 0x9104d5ef in -[NSObject release] () #10914 0x97f62ac8 in -[NSOperation dealloc] () #10915 0x9104d5ef in -[NSObject release] () #10916 0x97f49cca in __NSOQSchedule_f () #10917 0x9c1c9e21 in _dispatch_async_redirect_invoke () #10918 0x9c1c53a6 in _dispatch_client_callout () #10919 0x9c1c7467 in _dispatch_root_queue_drain () #10920 0x9c1c8732 in _dispatch_worker_thread2 () #10921 0x960c2dab in _pthread_wqthread () The full crash context is (bold for crash line): libobjc.A.dylib`objc::DenseMapBase<objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*> >, objc_object*, unsigned long, objc::DenseMapInfo<objc_object*>, true>::find(objc_object* const&): 0x9104d800: pushl %ebp 0x9104d801: movl %esp, %ebp 0x9104d803: pushl %esi 0x9104d804: subl $20, %esp 0x9104d807: leal -8(%ebp), %eax 0x9104d80a: movl %eax, 8(%esp) 0x9104d80e: movl 16(%ebp), %eax 0x9104d811: movl %eax, 4(%esp) 0x9104d815: movl 12(%ebp), %esi 0x9104d818: movl %esi, (%esp) **0x9104d81b: calll 0x9104d9b6 ; bool objc::DenseMapBase<objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*> >, objc_object*, unsigned long, objc::DenseMapInfo<objc_object*>, true>::LookupBucketFor<objc_object*>(objc_object* const&, std::__1::pair<objc_object*, unsigned long> const*&) const** 0x9104d820: movl 12(%esi), %ecx 0x9104d823: shll $3, %ecx 0x9104d826: addl (%esi), %ecx 0x9104d828: movl 8(%ebp), %edx 0x9104d82b: testb %al, %al 0x9104d82d: je 0x9104d836 ; objc::DenseMapBase<objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*> >, objc_object*, unsigned long, objc::DenseMapInfo<objc_object*>, true>::find(objc_object* const&) + 54 0x9104d82f: movl -8(%ebp), %eax 0x9104d832: movl %eax, (%edx) 0x9104d834: jmp 0x9104d838 ; objc::DenseMapBase<objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*> >, objc_object*, unsigned long, objc::DenseMapInfo<objc_object*>, true>::find(objc_object* const&) + 56 0x9104d836: movl %ecx, (%edx) 0x9104d838: movl %ecx, 4(%edx) 0x9104d83b: addl $20, %esp 0x9104d83e: popl %esi 0x9104d83f: popl %ebp 0x9104d840: ret $4 0x9104d843: nop I tried using a pre-created queue, this makes no difference. Apparently, with dependencies, this code is a problem with XCode 5.0, 32-bit. Edit: In fact, I can isolate the problem much further. An empty Cocoa Application project in XCOde 5.0 on 10.9 with ARC on and a single method will crash. If it does not on your computer, increase 4269 to anything bigger: - (void)applicationDidFinishLaunching:(NSNotification *)aNotification { NSOperationQueue* aQueue = [[ NSOperationQueue alloc ] init ]; NSMutableArray* array = [ NSMutableArray array ]; for ( int i = 0; i < 4269; i++) [ array addObject: [ [NSOperation alloc ] init ]]; for ( int i = 1; i < [ array count ]; i++) [[ array objectAtIndex:i ] addDependency:[array objectAtIndex:i-1]]; [ aQueue addOperations: array waitUntilFinished:NO ]; }

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• I just don't get AudioFileReadPackets

  - by Eric Christensen

  I've tried to write the smallest chunk of code to narrow down a problem. It's now just a few lines and it doesn't work, which makes it pretty clear that I have a fundamental misunderstanding of how to use AudioFileReadPackets. I've read the docs and other examples online, and apparently I'm just not getting. Could you explain it to me? Here's what this block should do: I've previously opened a file. I want to read just one packet - the first one of the file - and then print it. But it crashes on the AudioFileReadPackets line: AudioFileID mAudioFile2; AudioFileOpenURL (audioFileURL, 0x01, 0, &mAudioFile2); UInt32 *audioData2 = (UInt32 *)malloc(sizeof(UInt32) * 1); AudioFileReadPackets(mAudioFile2, false, NULL, NULL, 0, (UInt32*)1, audioData2); NSLog(@"first packet:%i",audioData2[0]); (For clarity, I've stripped out all error handling.) It's the AFRP line that crashes out. (I understand that the third and fourth argument are useful, and in my "real" code, I use them, but they're not required, right? So NULL in this case should work, right?) So then what's going on? Any guidance would be much appreciated. Thanks.

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• Is This a Valid Way to Use Blocks in Objective-C?

  - by Carter

  I've been building a HTTP client that uses web services to synchronize information between the client and server. I've been using Blocks and NSURLConnection to achieve this on the client side, but I'm getting frequent EXC_BAD_ACCESS crashes in objc_msgSend(). From what I understand, this usually means that a stored block that has fallen off the stack has been called. I think I've coded things correctly to avoid this, but I'm still stuck. Here is conceptually what my code is doing. It starts by calling "synchronizeWithWebServer". That method invokes "listRootObjectsOnServerWithBlock:" which takes in a block to be called when the method returns. "listRootObjectsOnServersWithBlock:" initiates a NSURLConnection to the web server asynchronously. It to expects a block to be called when it returns. Inside that block I want to be able to execute the original Block (so aptly named 'block'). This is only a simplified version of my code. The real synchronization process is more complex but it's mostly more of the same as what you see below. Sometimes the code works perfectly, but about 80% of the time it crashes very early on in the routine. It seems to be more vulnerable to crashing when my data set gets larger. - (void)synchronizeWithWebServer { [self listRootObjectsOnServerWithBlock:^(NSArray *results, NSError *error) { //Iterate over result objects and perform some other similar routines. }]; } - (void)listRootObjectsOnServerWithBlock:(void (^)(NSArray *results, NSError *error))block { //Create NSURLRequest Here //Create connection asynchronously. block = [block copy]; [NSURLConnection sendAsynchronousRequest:urlRequest queue:[NSOperationQueue currentQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){ //Parse response from web server (stored in NSData *data) NSArray *results = ..... //Call 'block' block(results, error); [block release]; }]; }

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• Why `A & a = a` is valid?

  - by psaghelyi

  #include <iostream> #include <assert.h> using namespace std; struct Base { Base() : m_member1(1) {} Base(const Base & other) { assert(this != &other); // this should trigger m_member1 = other.m_member1; } int m_member1; }; struct Derived { Derived(Base & base) : m_base(m_base) {} // m_base(base) Base & m_base; }; void main() { Base base; Derived derived(base); cout << derived.m_base.m_member1 << endl; // crashes here } The above example is a synthesized version of a mistyped constructor. I used reference at the class member Derived::m_base because I wanted to make sure that the member will be initialized as the constructor had called. One problem is that nor GCC nor MSVC gives me a warning at m_base(m_base). But the more serious for me is that the assert finds everything fine and the application crashes later (sometimes far away from the mistake). Question: Is there any way to indicate such mistakes?

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• Uncatchable AccesViolationException

  - by Roy

  Hi all, I'm getting close to desperate.. I am developing a field service application for Windows Mobile 6.1 using C# and quite some p/Invoking. (I think I'm referencing about 50 native functions) On normal circumstances this goes without any problem, but when i start stressing the GC i'm getting a nasty 0xC0000005 error witch seems uncatchable. In my test i'm rapidly closing and opening a dialog form (the form did make use of native functions, but for testing i commented these out) and after a while the Windows Mobile error reporter comes around to tell me that there was an fatal error in my application. My code uses a try-catch around the Application.Run(masterForm); and hooks into the CurrentDomain.UnhandledException event, but the application still crashes. Even when i attach the debugger, visual studio just tells me "The remote connection to the device has been lost" when the exception occurs.. Since I didn't succeed to catch the exception in the managed environment, I tried to make sense out of the Error Reporter log file. But this doesn't make any sense, the only consistent this about the error is the application where it occurs in. The thread where the application occurs in is unknown to me, the module where the error occurs differs from time to time (I've seen my application.exe, WS2.dll, netcfagl3_5.dll and mscoree3_5.dll), even the error code is not always the same. (most of the time it's 0xC0000005, but i've also seen an 0X80000002 error, which is a warning accounting the first byte?) I tried debugging through bugtrap, but strangely enough this crashes with the same error code (0xC0000005). I tried to open the kdmp file with visual studio, but i can't seem to make any sense out of this because it only shows me disassembler code when i step into the error (unless i have the right .pbb files, which i don't). Same goes for WinDbg. To make a long story short: I frankly don't have a single clue where to look for this error, and I'm hoping some bright soul on stackoverflow does. I'm happy to provide some code but at this moment I don't know which piece to provide.. Any help is greatly appreciated!

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• iPhone SDK background thread image loading problem

  - by retailevolved

  I have created a grid view that displays six "cells" of content. In each cell, an image is loaded from the web. There are a multiple pages of this grid (the user moves through them by swiping up / down to see the next set of cells). Each cell has its own view controller. When these view controllers load, they use an ImageLoader class that I made to load and display an image. These view controllers implement an ImageLoaderDelegate that has a single method that gets called when the image is finished loading. ImageLoader does its work on a background thread and then simply notifies its delegate when it is done loading, passing the image to the delegate method. Trouble is that if the user moves on to the next page of grid content before the image has finished loading (releasing the GridCellViewControllers that use the ImageLoaders), the app crashes. I suspect that this is because along the line, an asynchronous method finishes and attempts to notify its delegate but can't because it's been released. Here's some code to give a better picture: GridCellViewController.m: - (void)viewDidLoad { [super viewDidLoad]; // ImageLoader _loader = [[ProductImageLoader alloc] init]; _loader.delegate = self; if(_boundObject) [_loader loadImageForProduct:_boundObject]; } //ImageLoaderDelegate method - (void) imageDidFinishLoading: (UIImage *)image { [_imgController setImage:image]; } ProductImageLoader.m - (void) loadImageForProduct: (Product *) product { // Get image on another thread [NSThread detachNewThreadSelector:@selector(getImageForProductInBackground:) toTarget:self withObject:product]; } - (void) getImageForProductInBackground: (Product *) product { NSAutoreleasePool *tempPool = [[NSAutoreleasePool alloc] init]; HttpRequestLoader *tempLoader = [[HttpRequestLoader alloc] init]; NSURL *tempUrl = [product getImageUrl]; NSData *imageData = tempUrl ? [tempLoader loadSynchronousDataFromAddress:[tempUrl absoluteString]] : nil; UIImage *image = [[UIImage alloc] initWithData:imageData]; [tempPool release]; if(delegate) [delegate imageDidFinishLoading:image]; } The app crashes with EXC_BAD_ACCESS. Disclaimer: The code has been slightly modified to focus on the issue at hand.

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• Disassembling with python - no easy solution?

  - by Abc4599

  Hi, I'm trying to create a python script that will disassemble a binary (a Windows exe to be precise) and analyze its code. I need the ability to take a certain buffer, and extract some sort of struct containing information about the instructions in it. I've worked with libdisasm in C before, and I found it's interface quite intuitive and comfortable. The problem is, its Python interface is available only through SWIG, and I can't get it to compile properly under Windows. At the availability aspect, diStorm provides a nice out-of-the-box interface, but it provides only the Mnemonic of each instruction, and not a binary struct with enumerations defining instruction type and what not. This is quite uncomfortable for my purpose, and will require a lot of what I see as spent time wrapping the interface to make it fit my needs. I've also looked at BeaEngine, which does in fact provide the output I need, a struct with binary info concerning each instruction, but its interface is really odd and counter-intuitive, and it crashes pretty much instantly when provided with wrong arguments. The CTypes sort of ultimate-death-to-your-python crashes. So, I'd be happy to hear about other solutions, which are a little less time consuming than messing around with djgcc or mingw to make SWIGed libdisasm, or writing an OOP wrapper for diStorm. If anyone has some guidance as to how to compile SWIGed libdisasm, or better yet, a compiled binary (pyd or dll+py), I'd love to hear/have it. :) Thanks ahead.

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• Save QList<int> to QSettings

  - by Tobias

  Hello, I want to save a QList<int> to my QSettings without looping through it. I know that I could use writeArray() and a loop to save all items or to write the QList to a QByteArray and save this but then it is not human readable in my INI file.. Currently I am using the following to transform my QList<int> to QList<QVariant>: QList<QVariant> variantList; //Temp is the QList<int> for (int i = 0; i < temp.size(); i++) variantList.append(temp.at(i)); And to save this QList<Variant> to my Settings I use the following code: QVariant list; list.setValue(variantList); //saveSession is my QSettings object saveSession.setValue("MyList", list); The QList is correctly saved to my INI file as I can see (comma seperated list of my ints) But the function crashes on exit. I already tried to use a pointer to my QSettings object instead but then it crashes on deleting the pointer ..

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• Android - updating a list adapter creates a NullPointException

  - by GeekedOut

  I have a ListActivity which has an adapter that crashes. Here is the code that crashes the program: Question q = new Question (); q.setQuestion( "" ); questions.add(q); adapter = new ArrayAdapter<Question>(this, R.layout.user_question_list, R.id.label, questions); Here is how I create the adapter: ArrayAdapter<Question> adapter; ArrayList<Question> questions = new ArrayList <Question>( ); and the list xml is like this: <?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="10dp" android:textSize="16sp" > </TextView> and the overall Activity xml is like this: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/question_label" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Loading your questions..." /> <ListView android:id="@android:id/list" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@+id/label" android:textSize="20px" > </ListView> <Button android:id="@+id/add_question" android:layout_height="wrap_content" android:text="Ask a Question" android:onClick="sendFeedback" android:layout_width="fill_parent"> </Button> </LinearLayout> Any idea why the code where I try to update the adapter results in the NullPointerException? Thanks!!

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• How to switch from Core Data automatic lightweight migration to manual?

  - by Jaanus

  My situation is similar to this question. I am using lightweight migration with the following code, fairly vanilla from Apple docs and other SO threads. It runs upon app startup when initializing the Core Data stack. NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil]; NSError *error = nil; NSString *storeType = nil; if (USE_SQLITE) { // app configuration storeType = NSSQLiteStoreType; } else { storeType = NSBinaryStoreType; } persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; // the following line sometimes crashes on app startup if (![persistentStoreCoordinator addPersistentStoreWithType:storeType configuration:nil URL:[self persistentStoreURL] options:options error:&error]) { // handle the error } For some users, especially with slower devices, I have crashes confirmed by logs at the indicated line. I understand that a fix is to switch this to manual mapping and migration. What is the recipe to do that? The long way for me would be to go through all Apple docs, but I don't recall there being good examples and tutorials specifically for schema migration.

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• Reading email address from contacts fails with weird memory issue

  - by CapsicumDreams

  Hi all, I'm stumped. I'm trying to get a list of all the email address a person has. I'm using the ABPeoplePickerNavigationController to select the person, which all seems fine. I'm setting my ABRecordRef personDealingWith; from the person argument to - (BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker shouldContinueAfterSelectingPerson:(ABRecordRef)person property:(ABPropertyID)property identifier:(ABMultiValueIdentifier)identifier { and everything seems fine up till this point. The first time the following code executes, all is well. When subsequently run, I can get issues. First, the code: // following line seems to make the difference (issue 1) // NSLog(@"%d", ABMultiValueGetCount(ABRecordCopyValue(personDealingWith, kABPersonEmailProperty))); // construct array of emails ABMultiValueRef multi = ABRecordCopyValue(personDealingWith, kABPersonEmailProperty); CFIndex emailCount = ABMultiValueGetCount(multi); if (emailCount 0) { // collect all emails in array for (CFIndex i = 0; i < emailCount; i++) { CFStringRef emailRef = ABMultiValueCopyValueAtIndex(multi, i); [emailArray addObject:(NSString *)emailRef]; CFRelease(emailRef); } } // following line also matters (issue 2) CFRelease(multi); If compiled as written, the are no errors or static analysis problems. This crashes with a *** -[Not A Type retain]: message sent to deallocated instance 0x4e9dc60 error. But wait, there's more! I can fix it in either of two ways. Firstly, I can uncomment the NSLog at the top of the function. I get a leak from the NSLog's ABRecordCopyValue every time through, but the code seems to run fine. Also, I can comment out the CFRelease(multi); at the end, which does exactly the same thing. Static compilation errors, but running code. So without a leak, this function crashes. To prevent a crash, I need to haemorrhage memory. Neither is a great solution. Can anyone point out what's going on?

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• Can't connect to MySql database from server using Devart

  - by annelie

  Hello, I'm having trouble connecting to a MySql database from a server. I'm using Devart to connect, and I'm not sure if I need to do something more than to simply reference the dlls. When I started working on this project it was referencing the CoreLabs dlls, which if I've understood is the previous name for Devart. That didn't work, so I downloaded the new Devart dlls instead. It works on my local machine, but when uploading to the server it crashes. I made a tiny console app to test the connection, and it fails when initialising, before I've even assigned a host etc. Do I need to do anything more than just upload my .exe file to the server? using System; using System.Collections.Generic; using System.Linq; using System.Text; using Devart.Data; using Devart.Data.MySql; namespace TestDatabaseConnection { public class Program { public static void Main(string[] args) { Console.WriteLine("about to connect"); ConnectToDatabase(); Console.ReadLine(); } public static void ConnectToDatabase() { MySqlConnection connection = new MySqlConnection(); } } } UPDATE: I can't see what the error is, I had a try catch around MySqlConnection connection = new MySqlConnection(); but no exception is thrown, it just crashes. Thanks, Annelie

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• How can display gif on a subview in iPhone using glgif?

  - by iPhoney

  I want to display a gif image on a subview in iPhone. The sample code glgif shows the gif image on the controller's root view, but when I make the following modifications, the application just crashes: IBOutlet UIView *gifView; // gifView is added as a subview of controller's root view //PlayerView *plView = (PlayerView *)self.view; PlayerView *plView = (PlayerView *)gifView; // Load test.gif VideoSource NSString *str = [[NSBundle mainBundle] pathForResource:@"test" ofType:@"gif"]; FILE *fp = fopen([str UTF8String], "r"); VideoSource *src = VideoSource_init(fp, VIDEOSOURCE_FILE); src->writeable = false; // Init video using VideoSource Video *vid = [[GifVideo alloc] initWithSource:src inContext:[plView context]]; VideoSource_release(src); // Start if loaded if (vid) { [plView startAnimation:vid]; [vid release]; return; } // Cleanup if failed fclose(fp); Now the app crashes in this line: Video *vid = [[GifVideo alloc] initWithSource:src inContext:[plView context]]; with the error message:-[UIView context]: unrecognized selector sent to instance. Any ideas about how to add the plView to the subview properly?

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• How to Avoid PHP Object Nesting/Creation Limit?

  - by Will Shaver

  I've got a handmade ORM in PHP that seems to be bumping up against an object limit and causing php to crash. Here's a simple script that will cause crashes: <? class Bob { protected $parent; public function Bob($parent) { $this->parent = $parent; } public function __toString() { if($this->parent) return (string) "x " . $this->parent; return "top"; } } $bobs = array(); for($i = 1; $i < 40000; $i++) { $bobs[] = new Bob($bobs[$1 -1]); } ?> Even running this from the command line will cause issues. Some boxes take more than 40,000 objects. I've tried it on Linux/Appache (fail) but my app runs on IIS/FastCGI. On FastCGI this causes the famous "The FastCGI process exited unexpectedly" error. Obviously 20k objects is a bit high, but it crashes with far fewer objects if they have data and nested complexity. Fast CGI isn't the issue - I've tried running it from the command line. I've tried setting the memory to something really high - 6,000MB and to something really low - 24MB. If I set it low enough I'll get the "allocated memory size xxx bytes exhausted" error. I'm thinking that it has to do with the number of functions that are called - some kind of nesting prevention. I didn't think that my ORM's nesting was that complicated but perhaps it is. I've got some pretty clear cases where if I load just ONE more object it dies, but loads in under 3 seconds if it works.

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• Close TCP connection when owner process is already killed

  - by Otiel

  I have a Windows service that - when it starts - opens some WCF services to listen on the 8000 port. It happens that this service crashes sometimes. When it does, the TCP connection is not released, thus causing my service to throw an exception if I try to start it again: AddressAlreadyInUseException: There is already a listener on IP endpoint 0.0.0.0:8000 Some observations: When running CurrPorts or netstat -ano, I can see that the 8000 port is still in use (in LISTENING state) and is owned by the Process ID XXX that corresponded to my service process ID. But my service has already crashed, and does not appear in the Task Manager anymore. Thus I can't kill the process to free the port! Of course, running taskkill /PID XXX returns: ERROR: The process "XXX" not found. When running CurrPorts or netstat -b, I can see that the process name involved in creating the listening port is System, and not as MyService.exe (whereas it is MyService.exe when my service is running). I tried to use CurrPorts to close the connection, but I always get the following error message: Failed to close one or more TCP connections. Be aware that you must run this tool as admin in order to close TCP connections. (Useless to say, I do run CurrPorts as Administrator...) TCPView is not much help either: the process name associated to the 8000 port is <non-existent>, and doing "End process" or "Close connection" has no effect. I tried to see if there was not a child process associated with the PID XXX using Process Explorer, but no luck here. If I close my service properly (before it crashes), the TCP connection is correctly released. This is normal, as I close the WCF service hosts in the OnStop() event of my service. The only way I found to release the connection is to restart the server (which is not convenient in a production environment as you can guess). Waiting does not help, the TCP connection is never released. How can I close the connection without restarting the Windows server? PS: found some questions extremely similar to mine.

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• django + south + python: strange behavior when using a text string received as a parameter in a func

  - by carlosescri

  Hello, this is my first question. I'm trying to execute a SQL query in django (south migration): from django.db import connection # ... class Migration(SchemaMigration): # ... def transform_id_to_pk(self, table): try: db.delete_primary_key(table) except: pass finally: cursor = connection.cursor() # This does not work cursor.execute('SELECT MAX("id") FROM "%s"', [table]) # I don't know if this works. try: minvalue = cursor.fetchone()[0] except: minvalue = 1 seq_name = table + '_id_seq' db.execute('CREATE SEQUENCE "%s" START WITH %s OWNED BY "%s"."id"', [seq_name, minvalue, table]) db.execute('ALTER TABLE "%s" ALTER COLUMN id SET DEFAULT nextval("%s")', [table, seq_name + '::regclass']) db.create_primary_key(table, ['id']) # ... I use this function like this: self.transform_id_to_pk('my_table_name') So it should: Find the biggest existent ID or 0 (it crashes) Create a sequence name Create the sequence Update the ID field to use sequence Update the ID as PK But it crashes and the error says: File "../apps/accounting/migrations/0003_setup_tables.py", line 45, in forwards self.delegation_table_setup(orm) File "../apps/accounting/migrations/0003_setup_tables.py", line 478, in delegation_table_setup self.transform_id_to_pk('accounting_delegation') File "../apps/accounting/migrations/0003_setup_tables.py", line 20, in transform_id_to_pk cursor.execute(u'SELECT MAX("id") FROM "%s"', [table.encode('utf-8')]) File "/Library/Python/2.6/site-packages/django/db/backends/util.py", line 19, in execute return self.cursor.execute(sql, params) psycopg2.ProgrammingError: relation "E'accounting_delegation'" does not exist LINE 1: SELECT MAX("id") FROM "E'accounting_delegation'" ^ I have shortened the file paths for convenience. What does that "E'accounting_delegation'" mean? How could I get rid of it? Thank you! Carlos.

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• SIGABRT on iPhone when changing xib

  - by Boz

  I've just finished off an app for the iPhone which, until today, ran fine on the iPhone simulator and actual devices. I tried changing the xib which is loaded in the applicationDidFinishLaunching method in my application delegate class - all I did was change the string in initWithNibName. When I launch the app on the simulator, the Default.png image is shown, then the app crashes with an uncaught exception. When running on a device, the Default.png image is shown for about 10 seconds, the UI is never loaded and I get 'GDB: Program received signal: "SIGABRT".' on the Xcode status bar. Debugging shows that applicationDidFinishLaunching is never actually reached before the app crashes. Setting the starting xib back to the original solves the issue, but now I've made a change and saved it in the Interface Builder and the app shows the same issues as above - I've made no code changes at all. Is this a memory issue, or a known issue of a common mistake? NOTE: I've made no code changes whatsoever, and the only changes I've made to the xib are cosmetic, the IBOutlets are all intact.

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• Scanner error that I can't figure out: NoSuchElementException

  - by iaacp

  It's crashing on the third line inside the do-while loop, and doesn't wait for my input: input = kb.nextInt(); Stack trace: Exception in thread "main" java.util.NoSuchElementException at java.util.Scanner.throwFor(Unknown Source) at java.util.Scanner.next(Unknown Source) at java.util.Scanner.nextInt(Unknown Source) at java.util.Scanner.nextInt(Unknown Source) at main.MainDriver.main(MainDriver.java:50) Relevant code: do { displayFullMenu(); System.out.print("Selection: "); input = kb.nextInt(); switch (input) { //Create new survey case 1: currentSurvey = new Survey(); break; //Display current survey case 2: currentSurvey.display(); break; //Save current survey case 3: saveSurvey(currentSurvey); break; //Load a survey case 4: currentSurvey = loadSurvey(); break; //Modify a survey case 5: currentSurvey.modify(); break; /*******************Test Functions*******************/ //Create new test case 6: currentSurvey = new Test(); break; //Display current test case 7: currentSurvey.display(); break; //Save current test case 8: saveSurvey(currentSurvey); break; //Load a test case 9: currentSurvey = loadTest(); break; //Modify a test case 10: currentSurvey.modify(); default: System.out.println("Invalid choice. Please make a valid choice: "); input = kb.nextInt(); System.out.println(); } } while (input != 99); kb.close(); It crashes after I choose option 9. It saves the file correctly, then goes back to the top of the loop, and crashes at the previously mentioned line. I want it to ask for more input. What gives?

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• iPhone: Does it ever make sense for an object to retain its delegate?

  - by randombits

  According to the rules of memory management in a non garbage collected world, one is not supposed to retain a the calling object in a delegate. Scenario goes like this: I have a class that inherits from UITableViewController and contains a search bar. I run expensive search operations in a secondary thread. This is all done with an NSOperationQueue and subclasses NSOperation instances. I pass the controller as a delegate that adheres to a callback protocol into the NSOperation. There are edge cases when the application crashes because once an item is selected from the UITableViewController, I dismiss it and thus its retain count goes to 0 and dealloc gets invoked on it. The delegate didn't get to send its message in time as the results are being passed at about the same time the dealloc happens. Should I design this differently? Should I call retain on my controller from the delegate to ensure it exists until the NSOperation itself is dealloc'd? Will this cause a memory leak? Right now if I put a retain on the controller, the crashes goes away. I don't want to leak memory though and need to understand if there are cases where retaining the delegate makes sense. Just to recap. UITableViewController creates an NSOperationQueue and NSOperation that gets embedded into the queue. The UITableViewController passes itself as a delegate to NSOperation. NSOperation calls a method on UITableViewController when it's ready. If I retain the UITableViewController, I guarantee it's there, but I'm not sure if I'm leaking memory. If I only use an assign property, edge cases occur where the UITableViewController gets dealloc'd and objc_msgSend() gets called on an object that doesn't exist in memory and a crash is imminent.

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• Why does my Android App crash when loading image from gallery the 2nd time?

  - by Sebastian

  Hi folks, I've written an app, thats loading images either using the android gallery app or by taking a photo using the cam. When I now load an image using the gallery, everything is fine. When the code is being executed a second time (for loading another image), the application crashes. try { Uri data = intent.getData(); ContentResolver cr = this.getContentResolver(); Bitmap mBitmap = null; mBitmap = Media.getBitmap(cr, data); imageView.setImageBitmap(mBitmap); } catch(Exception e){ showToast(this, "Failed loading image from gallery"); return; } The code crashes at the line mBimap = Media.getBitmap(cr, data);. Everything is initialized, there are no null values etc. The strange thing is: no exception is thrown, I don't get into the catch block to determine whats going wrong. Does anyone have an idea about this? Am I not allowed to "re-use" the content resolver? Do I have to free it after the first usage or something like this?

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• How to debug a Gruntfile with breakpoints using node-inspector?

  - by Kris Hollenbeck

  So I have spent the past couple days trying to get this to work with no luck. Most of the solutions I have found seem to work "okay" for debugging node applications. But I haven't had much luck debugging grunt stand alone. I would like to be able to set breakpoints in my gruntfile and either step through the code with either the browser or an IDE. I have tried the following: Debugging using intelliJ IDE Using Grunt Console (Process finished with exit code 6) Debugging with Nodeeclipse (This sort of works okay but doesn't hit the breakpoints set in eclipse, not very intuitive) Debugging using node-inspector (This one also sort of works. I can step through a little ways using F11 and F10 in chrome. But eventually it just crashes. Using F8 to skip to break point never works.) ERROR MESSAGE USING NODE-INSPECTOR So currently node-inspector feels like it has gotten me the closest to what I want. To get here I did the following: From my grunt directory I ran the following commands: grunt node-inspector node --debug-brk Gruntfile.js And then from there I went to localhost:8080/debug?port=5858 to debug my Gruntfile.js. But like I mentioned above, as soon as I hit F8 to skip to breakpoint it crashes with the above error. Has anybody had any success using this method to try to debug a Gruntfile? So far from my search efforts I have not found a very well documented way of doing this. So hopefully this will be useful or beneficial information for future users. Also I am using Windows 7 by the way. Thanks in advance.

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• MapView EXC_BAD_ACCESS (SIGSEGV) and KERN_INVALID_ADDRESS

  - by user768113

  I'm having some 'issues' with my application... well, it crashes in an UIViewController that is presented modally, there the user enters information through UITextFields and his location is tracked by a MapView. Lets call this view controller "MapViewController" When the user submits the form, I call a different ViewController - modally again - that processes this info and a third one answers accordingly, then go back to a MenuVC using unwinding segues, which then calls MapViewController and so on. This sequence is repeated many times, but it always crashes in MapViewController. Looking at the crash log, I think that the MapView can be the problem of this or some element in the UI (because of the UIKit framework). I tried to use NSZombie in order to track a memory issue but it doesn't give me a clue about whats happening. Here is the crash log Hardware Model: iPad3,4 Process: MyApp [2253] OS Version: iOS 6.1.3 (10B329) Report Version: 104 Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x00000044 Crashed Thread: 0 Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 IMGSGX554GLDriver 0x328b9be0 0x328ac000 + 56288 1 IMGSGX554GLDriver 0x328b9b8e 0x328ac000 + 56206deallocated instance 2 IMGSGX554GLDriver 0x328bc2f2 0x328ac000 + 66290 3 IMGSGX554GLDriver 0x328baf44 0x328ac000 + 61252 4 libGPUSupportMercury.dylib 0x370f86be 0x370f6000 + 9918 5 GLEngine 0x34ce8bd2 0x34c4f000 + 629714 6 GLEngine 0x34cea30e 0x34c4f000 + 635662 7 GLEngine 0x34c8498e 0x34c4f000 + 219534 8 GLEngine 0x34c81394 0x34c4f000 + 205716 9 VectorKit 0x3957f4de 0x394c7000 + 754910 10 VectorKit 0x3955552e 0x394c7000 + 582958 11 VectorKit 0x394d056e 0x394c7000 + 38254 12 VectorKit 0x394d0416 0x394c7000 + 37910 13 VectorKit 0x394cb7ca 0x394c7000 + 18378 14 VectorKit 0x394c9804 0x394c7000 + 10244 15 VectorKit 0x394c86a2 0x394c7000 + 5794 16 QuartzCore 0x354a07a4 0x35466000 + 239524 17 QuartzCore 0x354a06fc 0x35466000 + 239356 18 IOMobileFramebuffer 0x376f8fd4 0x376f4000 + 20436 19 IOKit 0x344935aa 0x34490000 + 13738 20 CoreFoundation 0x33875888 0x337e9000 + 575624 21 CoreFoundation 0x338803e4 0x337e9000 + 619492 22 CoreFoundation 0x33880386 0x337e9000 + 619398 23 CoreFoundation 0x3387f20a 0x337e9000 + 614922 24 CoreFoundation 0x337f2238 0x337e9000 + 37432 25 CoreFoundation 0x337f20c4 0x337e9000 + 37060 26 GraphicsServices 0x373ad336 0x373a8000 + 21302 27 UIKit 0x3570e2b4 0x356b7000 + 357044 28 MyApp 0x000ea12e 0xe9000 + 4398 29 MyApp 0x000ea0e4 0xe9000 + 4324 I think thats all, additionally, I would like to ask you: if you are using unwind segues then you are releasing view controllers from the memory heap, right? Meanwhile, performing segues let you instantiate those controllers. Technically, MenuVC should be the only VC alive in the heap during the app life cycle if you understand me.

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• iPhone: Low memory crash...

  - by MacTouch

  Once again I'm hunting memory leaks and other crazy mistakes in my code. :) I have a cache with frequently used files (images, data records etc. with a TTL of about one week and a size limited cache (100MB)). There are sometimes more then 15000 files in a directory. On application exit the cache writes an control file with the current cache size along with other useful information. If the applications crashes for some reason (sh.. happens sometimes) I have in such case to calculate the size of all files on application start to make sure I know the cache size. My app crashes at this point because of low memory and I have no clue why. Memory leak detector does not show any leaks at all. I do not see any too. What's wrong with the code below? Is there any other fast way to calculate the total size of all files within a directory on iPhone? Maybe without to enumerate the whole contents of the directory? The code is executed on the main thread. NSUInteger result = 0; NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; NSDirectoryEnumerator *dirEnum = [[[NSFileManager defaultManager] enumeratorAtPath:path] retain]; int i = 0; while ([dirEnum nextObject]) { NSDictionary *attributes = [dirEnum fileAttributes]; NSNumber* fileSize = [attributes objectForKey:NSFileSize]; result += [fileSize unsignedIntValue]; if (++i % 500 == 0) { // I tried lower values too [pool drain]; } } [dirEnum release]; dirEnum = nil; [pool release]; pool = nil; Thanks, MacTouch

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• How should I deal with floating numbers that numbers that can get so small that the become zero

  - by Tristan Havelick

  So I just fixed an interesting bug in the following code, but I'm not sure the approach I took it the best: p = 1 probabilities = [ ... ] # a (possibly) long list of numbers between 0 and 1 for wp in probabilities: if (wp > 0): p *= wp # Take the natural log, this crashes when 'probabilites' is long enough that p ends up # being zero try: result = math.log(p) Because the result doesn't need to be exact, I solved this by simply keeping the smallest non-zero value, and using that if p ever becomes 0. p = 1 probabilities = [ ... ] # a long list of numbers between 0 and 1 for wp in probabilities: if (wp > 0): old_p = p p *= wp if p == 0: # we've gotten so small, its just 0, so go back to the smallest # non-zero we had p = old_p break # Take the natural log, this crashes when 'probabilites' is long enough that p ends up # being zero try: result = math.log(p) This works, but it seems a bit kludgy to me. I don't do a ton of this kind of numerical programming, and I'm not sure if this is the kind of fix people use, or if there is something better I can go for.

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• breadth-first traversal of directory tree is not lazy

  - by user855443

  I try to traverse the diretory tree. A naive depth-first traversal seems not to produce the data in a lazy fashion and runs out of memory. I next tried a breadth first approach, which shows the same problem - it uses all the memory available and then crashes. the code i have is: getFilePathBreadtFirst :: FilePath -> IO [FilePath] getFilePathBreadtFirst fp = do fileinfo <- getInfo fp res :: [FilePath] <- if isReadableDirectory fileinfo then do children <- getChildren fp lower <- mapM getFilePathBreadtFirst children return (children ++ concat lower) return (children ++ concat () else return [fp] -- should only return the files? return res getChildren :: FilePath -> IO [FilePath] getChildren path = do names <- getUsefulContents path let namesfull = map (path </>) names return namesfull testBF fn = do -- crashes for /home/frank, does not go to swap fps <- getFilePathBreadtFirst fn putStrLn $ unlines fps I think all the code is either linear or tail recursive, and I would expect that the listing of filenames starts immediately, but in fact it does not. Where is the error in my code and my thinking? where have I lost lazy evaluation?

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