CURLOPT_PROGRESSDATA(3)    Library Functions Manual    CURLOPT_PROGRESSDATA(3)

NAME
       CURLOPT_PROGRESSDATA - pointer passed to the progress callback

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROGRESSDATA, void *pointer);

DESCRIPTION
       Pass a pointer that is untouched by libcurl and passed as the first
       argument in the progress callback set with CURLOPT_PROGRESSFUNCTION(3).

DEFAULT
       The default value of this parameter is NULL.

PROTOCOLS
       All

EXAMPLE
       struct progress {
         char *private;
         size_t size;
       };

       static size_t progress_callback(void *clientp,
                                       double dltotal,
                                       double dlnow,
                                       double ultotal,
                                       double ulnow)
       {
         struct progress *memory = clientp;
         printf("private: %p\n", memory->private);

         /* use the values */

         return 0; /* all is good */
       }

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           struct progress data;

           /* pass struct to callback  */
           curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, &data);
           curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_callback);

           curl_easy_perform(curl);
         }
       }

AVAILABILITY
       Always

RETURN VALUE
       Returns CURLE_OK

SEE ALSO
       CURLOPT_PROGRESSFUNCTION(3), CURLOPT_XFERINFOFUNCTION(3)

libcurl                          April 26 2024         CURLOPT_PROGRESSDATA(3)