[Discuss-gnuradio] Block Output as a Variable for Another Block

Hello all,

I am trying to make the output of a block a variable for other blocks, as explained here:

https://lists.gnu.org/archive/html/discuss-gnuradio/2012-02/msg00581.html

My flowgraph is as follows:

The  configuration of the block "Variable" is:

I was wondering if there are other ways for doing this?....Is there a specific control block that changes an output to a variable?.....is there any other way of making an output as a variable?. 

Once again, thank you for the help.

Kind regards.