curl-w32/docs/libcurl/opts/CURLOPT_XFERINFODATA.md

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---
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_XFERINFODATA
Section: 3
Source: libcurl
See-also:
- CURLOPT_NOPROGRESS (3)
- CURLOPT_VERBOSE (3)
- CURLOPT_XFERINFOFUNCTION (3)
---
# NAME
CURLOPT_XFERINFODATA - pointer passed to the progress callback
# SYNOPSIS
~~~c
#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
~~~c
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