How to put things out of a block

Hi all,

In GNURadio we had ControlPort capability which is now disabled based on
some (unknown to me) reasons. ControlPort gave us a sort of control over
flowgraph such as setting or getting different parameters from different

So I have seriously a problem with accessing a parameter within a block
from “main” during runtime. Specially I’m speaking in C++ jargon so I
expect there is a kind of mechanism to put things out of a block (to
just like ControlPort.

Anyway, if someone knows how it’s possible without using ControlPort,
he/she will solve an old problem for me!

Best regards,