curl/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_DOWNLOAD.3

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.TH CURLINFO_CONTENT_LENGTH_DOWNLOAD 3 "1 Sep 2015" "libcurl 7.44.0" "curl_easy_getinfo options"
.SH NAME
CURLINFO_CONTENT_LENGTH_DOWNLOAD \- get content-length of download
.SH SYNOPSIS
.nf
#include <curl/curl.h>

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

\fICURLINFO_CONTENT_LENGTH_DOWNLOAD_T(3)\fP is a newer replacement that returns a more
sensible variable type.
.SH PROTOCOLS
HTTP(S)
.SH EXAMPLE
.nf
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);
    }
  }
}
.fi
.SH AVAILABILITY
Added in 7.6.1
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR curl_easy_getinfo "(3), " curl_easy_setopt "(3), "
.BR CURLINFO_CONTENT_LENGTH_UPLOAD "(3), "