Specifically, I replaced the READFUNCTION and READDATA with
WRITEFUNCTION and WRITEDATA respectively. At first I changed the
callback function to this:

     static size_t read_callback(void *ptr, size_t size, size_t nmemb,
void *stream)
     {
         curl_off_t nread;
         char *r = (char*)ptr;
         size_t retcode = fwrite(r, size, nmemb, (FILE*)stream);
         nread = (curl_off_t)retcode;
         return retcode;
     }

When I ran that, it would get the curl_easy_perform call, then the
program would freeze and crash. When I tried replacing the contents of
the callback function with this test:

fprint("%s.*", size, (char*)stream);
return 0;

It gave me the error code 23 I mentioned before.

On 3/3/2015 11:46 AM, Josh Angstadt wrote:
> Hi, I tried to use the write options as well, but when I used those I
> got an error from the connection, speciifcally error code 23
>
> On 3/3/2015 11:40 AM, Patrick Monnerat wrote:
>> Josh Angstadt wrote:
>>> curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
>>> curl_easy_setopt(curl, CURLOPT_READDATA, result);
>> Your program is supposed to DOWNLOAD, isn't it ?
>>
>> The http://curl.haxx.se/libcurl/c/CURLOPT_READFUNCTION.html specifies:
>>
>> CURLOPT_READFUNCTION - read callback for data UPLOADS.
>>
>> You probably need to use
>> http://curl.haxx.se/libcurl/c/CURLOPT_WRITEFUNCTION.html instead.
>>
>> If you just want to write received data to a file, use CURLOPT_WRITEDATA
>> with the preopened FILE * (CURLOPT_WRITEFUNCTION is set to fwrite by
>> default).
>> If you want to process data before writing it somewhere, please see
>> example http://curl.haxx.se/libcurl/c/getinmemory.html
>>
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Received on 2015-03-03