CFReadStream is “toll-free bridged” with its Cocoa Foundation counterpart, NSInputStream. This means that the Core Foundation type is interchangeable in function or method calls with the bridged Foundation object. Therefore,in a method where you see an NSInputStream * parameter,you can pass in a CFReadStreamRef,and in a function where you see a CFReadStreamRef parameter,you can pass in an NSInputStream instance. Note,however,that you may have either a delegate or callbacks but not both.
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