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Re: [Discuss-gnuradio] How to use gr_hier_block2 with multi output

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] How to use gr_hier_block2 with multi output
Date: Mon, 1 Oct 2012 17:34:51 -0400

On Thu, Sep 27, 2012 at 11:21 PM, Luong Tan Phong <address@hidden> wrote:
> Hi Lists,
> I've used gr_hier_block2 class with 1 output stream and it's OK but I can't
> use gr_hier_block2 with 2 output streams. Could you help me, please?
> Thanks.
> Phong

Yes, you should be able to set up an io_signature just like any other
block. You should then be able to use self.connect(block0, (self,0))
and self.connect(block1, (self,1)) to connect them up. Or the
appropriate C++ version for this.

The main restriction is that you cannot have a variable number of
streams. So if you use 2 output streams, you must use io_signature(2,
2, sizeof(...)) and then make sure both streams are connected in your


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