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CURLOPT_XFERINFODATA(3) Library Functions Manual CURLOPT_XFERINFODATA(3)

NAME

CURLOPT_XFERINFODATA - pointer passed to the progress callback

SYNOPSIS

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

DESCRIPTION

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).

DEFAULT

The default value of this parameter is NULL.

PROTOCOLS

All

EXAMPLE

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);
} }

AVAILABILITY

Added in 7.32.0

RETURN VALUE

Returns CURLE_OK

SEE ALSO

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

March 27 2024 libcurl