[cffi-devel] :uint64 ... how to handle on non-supporting platform ?

[Chun Tian (binghe)]

Hi, Frank

Unlike other CLs, Allegro CL is especially good at using "helper dlls", that is, you create a C function which doesn't use any 64-bit arguments in your own DLL and your function could call any other C library's functions which may have 64-bit arguments. Then you use CFFI to load the helper DLL instead.  Of course you have to handle type coerce from 32-bit to 64-bit by yourself. For example, the "delivery-tag" in your sample could be changed to two 32-bit arguments "delivery-tag_L" and "delivery_tag_H", both of them are typed of :uint32.

CFFI itself is excellent, however Franz (Allegro CL's vendor) is lazy ...

--binghe

在 2010-1-16，21:24， Frank Goenninger 写道：

> Hi -
> 
> thanks to Louis for answering my last question about function pointers.
> 
> I now have a new challenge: How to handle :uint64 when I using  
> AllegroCL 8.1 express edition on Mac OS X when this implementation is  
> not supporting :unsigned-long-long ?
> 
> I do have:
> 
> (defcfun ("amqp_basic_ack" %amqp-basic-ack) :int
>   (state        amqp-connection-state-t)
>   (channel      amqp-channel-t)
>   (delivery-tag :uint64)   ;;;  <<<<<< ----  this is my problem ...
>   (multiple     amqp-boolean-t))
> 
> Could I get around this with a clever padding of the 'multiple'  
> argument ?
> 
> Thanks for any advice!
> 
> Cheers
>   Frank
> 
> 
> 
> 
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