CURLOPT_PROGRESSDATA explained
NAME
CURLOPT_PROGRESSDATA - custom 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 will be untouched by libcurl and passed as the first argument in the progress callback set with CURLOPT_PROGRESSFUNCTION.
DEFAULT
The default value of this parameter is NULL.
PROTOCOLS
EXAMPLE
https://curl.se/libcurl/c/progressfunc.html
AVAILABILITY
RETURN VALUE
Returns CURLE_OK
SEE ALSO
CURLOPT_PROGRESSFUNCTION(3), CURLOPT_XFERINFOFUNCTION(3),
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