Re: Can Embedded Python Blocks have callbacks?

```

"""
Embedded Python Blocks:

Each time this file is saved, GRC will instantiate the first class it finds
to get ports and parameters of your block. The arguments to __init__  will
be the parameters. All of them are required to have default values!
"""

import numpy as np
from gnuradio import gr


class blk(gr.sync_block):  # other base classes are basic_block, decim_block, interp_block
    """Embedded Python Block example - a simple multiply const"""

    def __init__(self, example_param=1.0):  # only default arguments here
        """arguments to this function show up as parameters in GRC"""
        gr.sync_block.__init__(
            self,
            name='Embedded Python Block',   # will show up in GRC
            in_sig=[np.complex64],
            out_sig=[np.complex64]
        )
        # if an attribute with the same name as a parameter is found,
        # a callback is registered (properties work, too).
        self.example_param = example_param

    def work(self, input_items, output_items):
        """example: multiply with constant"""
        output_items[0][:] = input_items[0] * self.example_param
        return len(output_items[0])
   
    def set_example_param(self, asdf):
        print('here')

```

On Wed, Jun 19, 2024 at 12:12 PM Croizer Mathieu <croizer.mathieu@gmail.com> wrote:

Hello,

Can you post the rest of the code and a snapshot of your project in gnuradio?  Because with only your function, it's hard to say what happens in your python block :)

Best Regards

M. Croizer

Le mer. 19 juin 2024 à 14:52, Jameson Collins <jameson.collins@gmail.com> a écrit :

I'm trying to use a callback to set a variable in an embedded python block.  Using the tutorial (https://wiki.gnuradio.org/index.php/Embedded_Python_Block) as an example I added the function below.  I've found that this callback never gets called when I update this value from a GUI.  Should it be?

    def set_example_param(self, example_param):          print("here")