[cffi-devel] Passing address of pointer

[Martin Simmons]

>>>>> On Thu, 25 Aug 2011 19:19:41 +0200, Frank Goenninger said:
> 
>    (setq res (foreign-funcall-pointer
>                 query-interface-ptr
>                 ()
>                 :pointer plugInInterface
>                 CFUUIDBytes (cf-uuid-get-uuid-bytes
>                                kIOUSBDeviceInterfaceID)
>                 :pointer (foreign-slot-pointer privateDataRef
>                                                'MyPrivateData
>                                                'deviceInterface)))
> ...
> 
> This code "crashes" with signal 100 as reported by AllegroCL in the call to foreign-funcall-pointer ...

I suspect the problem is the UUID argument, not the pointer.

CFUUIDBytes is a struct type, i.e. you need to pass the aggregate by value.
IIRC, CFFI doesn't support that.

__Martin