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* Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
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CURLOPT_PROGRESSDATA - custom pointer passed to the progress callback #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROGRESSDATA, void *pointer); Pass a pointer that will be untouched by libcurl and passed as the first argument in the progress callback set with CURLOPT_PROGRESSFUNCTION(3). The default value of this parameter is NULL. All https://curl.haxx.se/libcurl/c/progressfunc.html Always Returns CURLE_OK CURLOPT_PROGRESSFUNCTION "(3), " CURLOPT_XFERINFOFUNCTION "(3), "