curl / libcurl / API / curl_easy_getinfo / CURLINFO_CONTENT_LENGTH_DOWNLOAD

CURLINFO_CONTENT_LENGTH_DOWNLOAD explained

Name

CURLINFO_CONTENT_LENGTH_DOWNLOAD - get 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. Since 7.19.4, this returns -1 if the size is not known.

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

Protocols

This functionality affects all supported protocols

Example

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);
      }
    }
  }
}

Deprecated

Deprecated since 7.55.0.

Availability

Added in curl 7.6.1

Return value

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.