Re: [naviserver-devel] ns_chan and ns_connchan

[David O. <da...@qc...>]

Re the first issue, I only have experience of ns_connchan but I believe the
situation is the same.
You can specify r,w,e, or x for the *argument* ?when? upon creation of the
callback, but the callback will be triggered upon timeout with a  *value*
of $when = "t" regardless of what you specify as the argument when setting
up the callback.

"The optional argument *when* can consist of one or more characters of r,
w, e, or x, specifying, when the callback should fire. "

Re the binary problem, What is it you are writing to the channel?

On 7 April 2017 at 08:43, Wolfgang Winkler <
wol...@di...> wrote:

> Hi!
>
> We have some long running scripts, e.g. shrinking of large PDF files, and
> want to prevent reverse proxy and browser timeouts.
>
> To achieve this, we are trying to periodically send small packages from
> the server to the browser while these scripts are running.
>
> First we tried with ns_conn and ns_sockcallback
>
> set mychan [ns_conn channel]
>
> ns_sockcallback $mychan noop t 1
>
> proc noop {handle when} {
>   # do something
> }
>
> ns_chan close $mychan
>
> When we call this, we get the following error:
>
> error invalid when specification "t": should be one/more of r, w, e, or x
>
> which contradicts the documentation of the command here:
>
> https://naviserver.sourceforge.io/n/naviserver/files/ns_sockcallback.html
>
> Then we tried something similiar with ns_connchan
>
> set mychan [ns_connchan detach]
>
> ns_connchan callback -timeout 1 $mychan noop "r"
>
> but a ns_connchan write $mychan throws the following error:
>
> ns_connchan: only binary channels are currently supported. Channel conn0
> is not binary
>
> Is there a solution to this problem?
>
> regards,
>
> Wolfgang
>
> --
>
> *Wolfgang Winkler*
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>
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>
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-- 
David Osborne
Qcode Software Limited
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