[zeromq-dev] pyczmq: zloop callback arguments?

Michel Pelletier pelletier.michel at gmail.com
Wed Nov 20 17:14:50 CET 2013


Ah I see what's up, poller() automatically wraps the arg in new_handle, but
timer does not.  In either case the callback author has to unbox the handle
back into whatever it was they passed in.  I'll push a PR.

-Michel


On Wed, Nov 20, 2013 at 8:07 AM, Michel Pelletier <
pelletier.michel at gmail.com> wrote:

> Yes this is unfortunate, the arg can only be something fii thinks is a
> pointer.  You have to "box/unbox" it with ffi.new_handle/fii.from_handle
>
> http://cffi.readthedocs.org/en/release-0.8/#misc-methods-on-ffi
>
> -Michel
>
>
> On Wed, Nov 20, 2013 at 4:09 AM, Michael Haberler <mail17 at mah.priv.at>wrote:
>
>> I'm stuck at passing 'self' as a timer callback argument:
>>
>> Class Test:
>>
>>     @ffi.callback('zloop_fn')
>>     def timer_event(loop, item, arg):
>>        print type(loop), type(item), type(arg)
>>
>>     def __init__(self):
>>         ...
>>         zloop.timer(self.loop, msec, 1, self.timer_event, self)
>>         # this raises: TypeError: initializer for ctype 'void *' must be
>> a cdata pointer, not instance
>>
>> how do I coerce this into action?
>>
>> - Michael
>> _______________________________________________
>> zeromq-dev mailing list
>> zeromq-dev at lists.zeromq.org
>> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>
>
>
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