CURLOPT_XFERINFODATA(3) Library Functions Manual CURLOPT_XFERINFODATA(3)

CURLOPT_XFERINFODATA - pointer passed to the progress callback

#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_XFERINFODATA, void *pointer);

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

This is an alias for CURLOPT_PROGRESSDATA(3).

The default value of this parameter is NULL.

All

struct progress {
  char *private;
  size_t size;
};
static size_t progress_cb(void *clientp,
                          curl_off_t dltotal,
                          curl_off_t dlnow,
                          curl_off_t ultotal,
                          curl_off_t ulnow)
{
  struct progress *memory = clientp;
  printf("private ptr: %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_XFERINFODATA, &data);
    curl_easy_setopt(curl, CURLOPT_XFERINFOFUNCTION, progress_cb);
  }
}

Added in 7.32.0

Returns CURLE_OK

CURLOPT_NOPROGRESS(3), CURLOPT_VERBOSE(3), CURLOPT_XFERINFOFUNCTION(3)

April 26 2024 libcurl