Hi Mohammad, this sounds like a wise architecture, using a message to update settings.
To answer your question: > how i can update a variable block value in python code , is that possible at all ? As you noticed, yes, that's possible, because the GUI sliders etc. do that! However, it only works because these are actually living directly in the top_block python code. What you **can** do is write a python block, which, as a parameter, takes a reference to the top_block (or hier block) which it "lives" in, and stores it in a class member. Then you can call .set_variablename(value) on that in your message handler. I do **not** recommend that, however. It breaks the inherent thread safety of message passing, makes a large detour through python that will cost a lot of copies and unnecessary type conversions "under the hood"... Instead, better simply go and improve the FFT Filter! Add a message port that accepts new taps! I think we'd all love to see that becoming a feature, so if you can, please make that change and contribute it to GNU Radio! Also, it's less work than writing the python block that I mentioned above. Best regards, Marcus On 12.08.2017 11:51, mohammad nejati wrote: > Hi , > I want to update taps in "FFT FILTER" block in run time , i have a > block that can send this taps as a message every 1 secound . i write > an python block witch get this message what i want to do is get this > message and update value of a variable block wich is used in FFT > FILTER . but i dont know how i can update a variable block value in > python code , is that possible at all ? > > _______________________________________________ > Discuss-gnuradio mailing list > Discussfirstname.lastname@example.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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