Which data format for efficient socket communication in C++/Qt [closed]

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I want to implement a profiler which tracks the state of the JVM in real time. I am not sure which data format would be appropriate for this task as I have to receive updates of the state of the JVM.

I thought XML would be great, bu开发者_Python百科t with every change sending the whole XML data seems to be very bogus.

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Maybe JSON Format? http://www.json.org/