Data from FFT sink

Hi all,

I’m using RFX2400 in my research to build a cognitive radio based
system.
i’m performing a Spectrum scan and displaying the spectrum using
fftsink2.But i need to display as well as get the data for further
analysis.
I went through the fftsink2 code but it did not help. I wanted to know
if
there is anyway to obtain the values after FFT is performed so as to
compare
with a threshold or communicate it to a peer.

Thank You
Swapna R.