> -----Original Message-----
> From: curl-library-bounces_at_cool.haxx.se
> [mailto:curl-library-bounces_at_cool.haxx.se] On Behalf Of
> Daniel Stenberg
> Sent: Friday, November 06, 2009 5:20 PM
> To: libcurl development
> Subject: RE: [mem curl]
>
> If you want. Your write callback set with
> CURLOPT_WRITEFUNCTION is the only one that uses that data so
> it can be used for anything you like.

Ah, you are right. Anyway, CURLOPT_WRITEDATA is used for the downloaded data/file from the server. And how to use the data is up to the application itself. That's when a callback func associated with CURLOPT_WRITEFUNCTION comes into the scenario.
 
> If you *don't* use CURLOPT_WRITEFUNCTION however, you MUST
> make CURLOPT_WRITEDATA be a FILE * to a valid file handle if
> you set the option.

This is the case for my SFTP application, which only cares about upload/download. :-)

> But I would assume that very few applications use that
> default functionality.

Thanks,
Xu Qiang
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Received on 2009-11-06