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POhow do I catch a NSRangeException?
 

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  1. POhow do I catch a NSRangeException?
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    <p>I want my app to continue gracefully when the online server messes up. I tried to wrap the dangerous line in a <code>@try</code> block. Yet it is still crashing like so:</p> <p>the method:</p> <pre><code>+ (NSArray *)findAllFor:(NSObject *)ratable { NSString *ratingsPath = [NSString stringWithFormat:@"%@%@/%@/%@%@", [self getRemoteSite], [ratable getRemoteCollectionName], [ratable getRemoteId], [self getRemoteCollectionName], [self getRemoteProtocolExtension]]; Response *res = [ORConnection get:ratingsPath withUser:[[self class] getRemoteUser] andPassword:[[self class] getRemotePassword]]; NSArray *ratings; @try { ratings = [self fromXMLData:res.body]; } @catch (NSException *e) { ratings = [NSArray array]; } return ratings; } </code></pre> <p>the stack trace:</p> <pre> Program received signal: “SIGABRT”. 2010-08-07 16:38:51.846 TalkToHer[68608:7003] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSArray objectAtIndex:]: index 1 beyond bounds [0 .. 0]' *** Call stack at first throw: ( 0 CoreFoundation 0x02932919 __exceptionPreprocess + 185 1 libobjc.A.dylib 0x02a805de objc_exception_throw + 47 2 CoreFoundation 0x0292858c -[__NSArrayI objectAtIndex:] + 236 3 TalkToHer 0x00009fa7 -[FromXMLElementDelegate parser:didEndElement:namespaceURI:qualifiedName:] + 425 4 Foundation 0x0017bcc1 _endElementNs + 453 5 libxml2.2.dylib 0x02d9deb6 xmlParseXMLDecl + 1353 6 libxml2.2.dylib 0x02da8bc1 xmlParseChunk + 3985 7 Foundation 0x0017b4c2 -[NSXMLParser parse] + 321 8 TalkToHer 0x0000b14d +[NSObject(XMLSerializableSupport) fromXMLData:] + 201 9 TalkToHer 0x00031a6c +[Rating findAllFor:] + 320 10 TalkToHer 0x00032d67 -[FirstClassContentPiece(Ratable) updateRatings] + 96 11 TalkToHer 0x00004d5f __-[InspirationController tableView:didSelectRowAtIndexPath:]_block_invoke_3 + 33 12 libSystem.B.dylib 0x9792efe4 _dispatch_call_block_and_release + 16 13 libSystem.B.dylib 0x97921a4c _dispatch_queue_drain + 249 14 libSystem.B.dylib 0x979214a8 _dispatch_queue_invoke + 50 15 libSystem.B.dylib 0x979212be _dispatch_worker_thread2 + 240 16 libSystem.B.dylib 0x97920d41 _pthread_wqthread + 390 17 libSystem.B.dylib 0x97920b86 start_wqthread + 30 ) terminate called after throwing an instance of 'NSException' </pre> <p>Is my syntax for <code>@try @catch</code> wrong? I attempted to add a <code>@catch</code> block for <code>NSRangeException</code> but it seems that's not the right approach (it's not a class).</p> <p>Also, the server error is caused by <code>[ratable getRemoteId]</code> sometimes returning <code>(null)</code> instead of an integer. This behavior seems pretty unpredictable; if anyone has a clue why <code>ObjectiveResource</code> might be doing that it would be helpful. But I still would like to know how to use <code>@try @catch</code>.</p>
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