[cffi-devel] Passing address of pointer

[Frank Goenninger]

Am 26.08.2011 um 12:52 schrieb Luís Oliveira:

> On Fri, Aug 26, 2011 at 10:08 AM, Frank Goenninger <frgo at me.com> wrote:
>> kr = (*privateDataRef->deviceInterface)->GetLocationID(privateDataRef->deviceInterface, &locationID);
>> 
>> Here I need to pass the address of a pointer to IOUSBDeviceInterface struct ...
> 
> Couldn't you call it like this?
> 
>  IOUSBDeviceInterface *foo;
>  GetLocationID(&foo, ...);
> 
> If you can, I'd try reducing your test case to allocate a pointer
> using WITH-FOREIGN-OBJECT and pass that to GetLocationID instead of
> using a struct.
> 
> Cheers,

And how would the CFFI equivalent to 

>  GetLocationID(&foo, ...);


look like?

I still need the address of a variable that holds a pointer (and not the struct)... 

(with-foreign-object (ptr :pointer)
  ...

?

Cheers
  Frank