On Sat, 20 Feb 2010, David Haugh wrote:

> curl_easy_setopt(d, CURLOPT_URL, finalURL);
> curl_easy_setopt(d, CURLOPT_WRITEFUNCTION, NULL);
> curl_easy_setopt(d, CURLOPT_WRITEDATA, fp);
> curl_easy_setopt(d, CURLOPT_USERAGENT, "Mozilla/4.0");

> The curl_easy_setopt docs for CURLOPT_WRITEFUNCTION say: Set this option to
> NULL to get the internal default function. The internal default function
> will write the data to the FILE * given with CURLOPT_WRITEDATA. So shouldn't
> it be writing whatever it gets from finalURL to fp? Because the file pointed
> to by fp is completely blank no matter what the inputs to the program are.

CURLOPT_WRITEFUNCTION set to NULL just puts it to the internal default, so in
this case it has no actual effect since it already was at default.

To debug, I suggest you start with enabling CURLOPT_VERBOSE and you check the
return code from curl_easy_perform().

-- 
  / daniel.haxx.se
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