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Re: Callbacks from modules
From: |
joakim |
Subject: |
Re: Callbacks from modules |
Date: |
Thu, 26 Nov 2015 17:17:40 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) |
Eli Zaretskii <address@hidden> writes:
>> From: Ivan Andrus <address@hidden>
>> Date: Wed, 25 Nov 2015 23:08:48 -0700
>>
>> I’ve started writing an Emacs module to access NSSpeechSynthesizer on OS X
>> (and
>> maybe GNUStep though I haven’t tested it there). I’ve been using the
>> mod-test
>> module as an example and I have it working reasonably well except that I
>> don’t
>> have any idea how to run a callback.
>>
>> When the synthesizer is done speaking it sends an Objective-C message
>> speechSynthesizer:didFinishSpeaking. From there I would like to run an
>> elisp
>> hook, say `ns-speech-finished-speaking-hook`. How can I do this? Do I have
>> to
>> squirrel away a pointer to an emacs_env somehow? I tried naively storing
>> env
>> from a previous call but, not surprisingly, the pointer is invalid when I
>> try
>> to use it.
>
> How would you do that in Emacs's core code? A module is just a
> (limited) extension of the Emacs core, so when you ask such questions,
> you should first think how Emacs core does that.
>
> Anyway, I assume you have a C callback in your module that is
> triggered by the speechSynthesizer:didFinishSpeaking message, is that
> right? Then one way would be to have that callback set a flag,
> provide a Lisp-callable function that returns the flag, and then start
> a timer that will test the flag and call your Lisp callback when the
> flag is set.
>
> Another, perhaps simpler, possibility would be to have the module
> provide a Lisp-callable function that will register a Lisp callback.
> Then your C callback will simply call that Lisp function.
>
> Would any of these do the job?
>
>
For the xwidget code I used events. Wouldn't that work here as well?
--
Joakim Verona
Re: Callbacks from modules, Philipp Stephani, 2015/11/26