Ahh, no vector sink. The vector sink will queue up samples forever, and
although you can clear the buffer, you will not stay vector aligned with
the fft size.
Vector sink is good for the QA code with a finite number of samples in
and out, but i would definitely not recommend it for dealing with live data.
You can use vector sink.
ex:
dst = gr.vector_sink_f()
then you can see the data in this vector by:
print dst.data()
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