Michal Marek wrote:
> Stephen Collyer wrote:
>> I want to use a CURLOPT_HEADERFUNCTION but without passing a FILE*
>> via CURLOPT_HEADERDATA.
>>
>> Is this safe ?
>
> Yes, the last argument to your callback will be NULL. It only has the
> special FILE* meaning when you don't use your own callback, otherwise
> you can set it to anything you want to use in the callback (or leave it
> at NULL).
>
> Michal

Thanks. I suspected that this was the case, but I notice
that there is a warning about using one of the callbacks
in Win32 without passing a data element, and I wanted to check.

-- 
Regards
Steve Collyer
Netspinner Ltd