--- c: Copyright (C) Daniel Stenberg, , et al. SPDX-License-Identifier: curl Title: CURLINFO_CONTENT_LENGTH_DOWNLOAD Section: 3 Source: libcurl See-also: - CURLINFO_CONTENT_LENGTH_UPLOAD (3) - curl_easy_getinfo (3) - curl_easy_setopt (3) Protocol: - All --- # NAME CURLINFO_CONTENT_LENGTH_DOWNLOAD - get content-length of download # SYNOPSIS ~~~c #include 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. Since 7.19.4, 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. # EXAMPLE ~~~c int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode res; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); /* Perform the request */ res = curl_easy_perform(curl); if(!res) { /* check the size */ double cl; res = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &cl); if(!res) { printf("Size: %.0f\n", cl); } } } } ~~~ # AVAILABILITY Added in 7.6.1. Deprecated since 7.55.0. # RETURN VALUE Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.