CODEWITHSUNDEEP
ioscocoa-touchnsdatansstreamtransmission
Peter Lapisu
Peter Lapisu

Reputation: 21005

Knowing that data from an NSStream is complete

I'am sending chunks of UIImage data over MCSession with an NSStream.

When I get bytes 

- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode {

   if (eventCode == NSStreamEventHasBytesAvailable) {

      // read data and append to self.data
      // how to know that self.data can be used to create UIImage

   }

}

I append them to a mutable data instance. The problem is how to know that the accumulated data represents a full image, so I can use -[UIImage initWithData:] to create it?

Upvotes: 0

Views: 205

Answers (2)

jscs
jscs

Reputation: 64012

The stream has no knowledge of its contents. If you can't rely on the stream ending to tell you that the data is complete, then you either need to use/create some protocol for the transmission that includes a "finished" signal, or just try to create the image and take appropriate action if that fails.

Upvotes: 1

Lance
Lance

Reputation: 9012

You should watch for NSStreamEventEndEncountered

Upvotes: 1

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