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neonichu/Circular.m

Created April 23, 2014 08:41
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NSKeyedArchiver with circular arrays
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Circular.m
NSMutableArray* bar = [@[] mutableCopy];
NSArray* foo = @[ bar ];
[bar addObject:foo];
//NSLog(@"%@", foo);
NSString *fileName = [NSString stringWithFormat:@"%@_%@",
[[NSProcessInfo processInfo] globallyUniqueString], @"file.data"];
NSURL* tempfileURL = [NSURL fileURLWithPath:[NSTemporaryDirectory()
stringByAppendingPathComponent:fileName]];
NSMutableData *data = [NSMutableData data];
NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
[foo encodeWithCoder:archiver];
[archiver finishEncoding];
[data writeToURL:tempfileURL atomically:YES];
NSData *readData = [NSData dataWithContentsOfURL:tempfileURL];
NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:readData];
NSArray* moo = [[NSArray alloc] initWithCoder:unarchiver];
[unarchiver finishDecoding];
NSLog(@"%@", moo);
@neonichu
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This crashes when logging moo with

'NSInvalidArgumentException', reason: '*** -[NSMutableArray count]: method sent to an uninitialized mutable array object'

So I can archive but not unarchive a circular graph?

@neonichu
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Documentation seems to suggest it should work with NSKeyedArchiver, just not with NSCoder.

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