curl-curl/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_DOWNLOAD.md

c	SPDX-License-Identifier	Title	Section	Source	See-also	Protocol	Added-in
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.	curl	CURLINFO_CONTENT_LENGTH_DOWNLOAD	3	libcurl	CURLINFO_CONTENT_LENGTH_UPLOAD (3) curl_easy_getinfo (3) curl_easy_setopt (3)	All	7.6.1

NAME

CURLINFO_CONTENT_LENGTH_DOWNLOAD - content-length of download

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CONTENT_LENGTH_DOWNLOAD,
                           double *content_length);

DESCRIPTION

Pass a pointer to a double to receive the content-length of the download. This is the value read from the Content-Length: field. This returns -1 if the size is not known.

CURLINFO_CONTENT_LENGTH_DOWNLOAD_T(3) is a newer replacement that returns a more sensible variable type.

%PROTOCOLS%

EXAMPLE

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode result;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

    /* Perform the request */
    result = curl_easy_perform(curl);

    if(result == CURLE_OK) {
      /* check the size */
      double cl;
      result = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &cl);
      if(result == CURLE_OK) {
        printf("Size: %.0f\n", cl);
      }
    }
  }
}

DEPRECATED

Deprecated since 7.55.0.

%AVAILABILITY%

RETURN VALUE

curl_easy_getinfo(3) returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3).