NSXMLParser on iOS8 - NSXMLParser does not support reentrant parsing

Question

I have NSXMLParser problem, and i tried iOS8 NSXMLParser crash this topic, but i really did not get the solution.

I am creating another NXSMLParser delegate and setting its delegate in another class.

Could you please tell me what to do exactly, step by step? I am so confused.

Here is my code;

These lines of codes are inside the STXMLParser

   STXMLParser2 *stXMLParser2 = [[STXMLParser2 alloc]init];    

    stXMLParser2.xmlParser = [[NSXMLParser alloc] initWithData:responseLoader.xmlData];
    [stXMLParser2.xmlParser setDelegate:self];
    [stXMLParser2.xmlParser setShouldResolveExternalEntities:YES];
    [stXMLParser2.xmlParser parse];

I think I've got a similar issue, but I'm using Swift. the parser crash at the time I call .parse() on it — Thibaut LE LEVIER, Sep 05 '14 at 23:55

score 16 · Answer 1 · answered Sep 04 '14 at 08:16

16

You can try this code:

dispatch_queue_t reentrantAvoidanceQueue = dispatch_queue_create("reentrantAvoidanceQueue", DISPATCH_QUEUE_SERIAL);
    dispatch_async(reentrantAvoidanceQueue, ^{
        STXMLParser2 *stXMLParser2 = [[STXMLParser2 alloc]init];    
        stXMLParser2.xmlParser = [[NSXMLParser alloc] initWithData:responseLoader.xmlData];
        [stXMLParser2.xmlParser setDelegate:self];
        [stXMLParser2.xmlParser setShouldResolveExternalEntities:YES];
        [stXMLParser2.xmlParser parse];
    });
    dispatch_sync(reentrantAvoidanceQueue, ^{ });

answered Sep 04 '14 at 08:16

rozochkin

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1

@JackSolomon If you are using a bunch of different `NSXMLParser` instances, you need to fix the case where you're calling `parse` for an `NSXMLParser` in a delegate callback from another `NSXMLParser`. This answer didn't fix my problem until I figured that little bit out. – mbm29414 Oct 25 '14 at 13:27
Worked for me. Thanks! – DocAsh59 Jul 25 '17 at 14:29

score 2 · Answer 2 · answered Jun 15 '15 at 05:45

I was getting the same error and it turned out that the problem was due to calling a UI update in the func parserDidEndDocument(parser: NSXMLParser) which does not run on the main thread. After forcing the UI update in that function to run on the main queue, the problem was resolved.

score 0 · Answer 3 · answered Apr 25 '15 at 12:59

I encountered the same problem recently but it turned out that I had an exception in one of my delegates (KVO problem) and once I fixed that the reentracy error went away. So it might be worth to look for something else if you don't have an obvious multithreading or multiinstance problem.

NSXMLParser on iOS8 - NSXMLParser does not support reentrant parsing

3 Answers3

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