Way back, Ali wanted a way to count elapsed time (seconds) from a File Sink.
Marcus posted a revelatory answer using Function Probe.
Well, that works great for an SDR Wav File Source too. Now I can display the
result in a GUI Label or Dial Gauge from an integer variable
"elapsed_seconds" - thanks!
But (and sorry for a beginner's ignorance), what I'd really like is a
display in Time format (hh:mm:ss).
So, I've set up the following variable chain:
"start_datetime": date-time the original WAV file recording began.
"current_datetime": value start_datetime + timedelta
(seconds=elapsed_seconds)
"current_time_string": value current_datetime.strftime('%H:%M:%S')
These all seem to give the right static results in the flowgraph editor.
Sadly, a GUI label with (type string) value current_time_string only ever
displays the constant initial value of current_time_string - as if either
the variable or the label does not update dynamically from elapsed_seconds.
Obviously don't know what I'm doing. Please help.
Best regards
Paul
