1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: CURLINFO_CONTENT_LENGTH_DOWNLOAD 5Section: 3 6Source: libcurl 7See-also: 8 - CURLINFO_CONTENT_LENGTH_UPLOAD (3) 9 - curl_easy_getinfo (3) 10 - curl_easy_setopt (3) 11Protocol: 12 - All 13--- 14 15# NAME 16 17CURLINFO_CONTENT_LENGTH_DOWNLOAD - get content-length of download 18 19# SYNOPSIS 20 21~~~c 22#include <curl/curl.h> 23 24CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CONTENT_LENGTH_DOWNLOAD, 25 double *content_length); 26~~~ 27 28# DESCRIPTION 29 30Pass a pointer to a double to receive the content-length of the download. This 31is the value read from the Content-Length: field. Since 7.19.4, this returns 32-1 if the size is not known. 33 34CURLINFO_CONTENT_LENGTH_DOWNLOAD_T(3) is a newer replacement that returns a more 35sensible variable type. 36 37# EXAMPLE 38 39~~~c 40int main(void) 41{ 42 CURL *curl = curl_easy_init(); 43 if(curl) { 44 CURLcode res; 45 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); 46 47 /* Perform the request */ 48 res = curl_easy_perform(curl); 49 50 if(!res) { 51 /* check the size */ 52 double cl; 53 res = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &cl); 54 if(!res) { 55 printf("Size: %.0f\n", cl); 56 } 57 } 58 } 59} 60~~~ 61 62# AVAILABILITY 63 64Added in 7.6.1. Deprecated since 7.55.0. 65 66# RETURN VALUE 67 68Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. 69