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Re: [Discuss-gnuradio] Question about GNU Radio Companion - Calling an e

From: CEL
Subject: Re: [Discuss-gnuradio] Question about GNU Radio Companion - Calling an external function from a QT GUI Push Button
Date: Mon, 15 Jul 2019 17:05:54 +0000

Really quick:

* write a Python class that has a function that takes an argument, and
calls the external function you want
* write a GRC block definition (GNU Radio 3.7: XML file, GNU Radio 3.8:
YAML), wrapping that class
* in that, define a property that has a callback; use the function
you've defined above
* add the block to your flow graph
* use the ID of your push button in the aforementioned property.

I see no way of doing that with stock GNU Radio blocks. 

Best regards,

On Mon, 2019-07-15 at 19:34 +0300, Vladimir Marinov wrote:
> Hello,
> I'm working on a project with GNU Radio Companion and I have a question about 
> how calling an external function ( defined in a separate .py file ) might be 
> achieved.
> My goal is to be able to create a QT Push Button, which when pressed would 
> call the function.
> I was initially hoping to use the QT Push Button Block from GNU Radio 
> Companion and somehow set its callback function to be the desired one. Now, 
> after reading through the docs and looking through the settings for the block 
> in GNU Radio Companion, as I understand it the Push Button Block is 
> essentially a variable with two different values depending on if the button 
> is pressed or not. Am I missing something or is it not possible for the block 
> to call some other external function of my own. 
> I know that this could be fixed by creating an Out-Of-Tree block, or by 
> modifying the python file that GNU Radio Companion generates, but as this 
> project is going to be used for educational purposes, I would prefer to keep 
> it as simple as possible ( if possible only within the standard blocks from 
> GNU Radio Companion).
> Any tips would be very appreciated. Thanks for your time!
> Best Regards,
> Vlady
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> Discuss-gnuradio mailing list
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