CURLINFO_CONTENT_LENGTH_DOWNLOAD

Section: curl_easy_getinfo options (3)
Updated: November 04, 2020
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NAME

CURLINFO_CONTENT_LENGTH_DOWNLOAD - get content-length of download

SYNOPSIS

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 isn't known.

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

PROTOCOLS

HTTP(S)

EXAMPLE

CURL *curl = curl_easy_init();
if(curl) {
  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

RETURN VALUE

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