If I create a stream,

str = StringToStream["how can I dynamically display the stream position"];
Read[str, Word]


then, when I use,


The output will not dynamically update the current state of the stream position.

Any ideas?

  • $\begingroup$ Same issue with Dynamic[Streams[ ]] $\endgroup$ Nov 20, 2015 at 20:39
  • $\begingroup$ A workaround, of course Dynamic[Refresh[Streams[], UpdateInterval -> 1]] $\endgroup$ Nov 20, 2015 at 20:46
  • 1
    $\begingroup$ The stream str contains only stream ID and it never changes. You can obtain full stream information with Internal`StreamInformation[str]. Unfortunately, It doesn't solve the problem. $\endgroup$
    – ybeltukov
    Nov 20, 2015 at 21:46

1 Answer 1


To not prompt Dynamic each second or something, let's create useless variable that will prompt it.

Dynamic[T`r; StreamPosition[str]]
read = (T`r = Read[##]) &;
read[str, Word]
  • $\begingroup$ Veggy, veggy nice! $\endgroup$ Nov 20, 2015 at 21:43
  • $\begingroup$ Well done! could you perhaps explain the mechanics behind these notations? i.e. the " ` " $\endgroup$ Nov 20, 2015 at 23:00
  • $\begingroup$ @peter I just used T contex to not pollute the default Global` . $\endgroup$
    – Kuba
    Nov 20, 2015 at 23:29
  • $\begingroup$ @Kuba cool, thanks $\endgroup$ Nov 20, 2015 at 23:49

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