1 .\" **************************************************************************
3 .\" * Project ___| | | | _ \| |
4 .\" * / __| | | | |_) | |
5 .\" * | (__| |_| | _ <| |___
6 .\" * \___|\___/|_| \_\_____|
8 .\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
10 .\" * This software is licensed as described in the file COPYING, which
11 .\" * you should have received as part of this distribution. The terms
12 .\" * are also available at https://curl.haxx.se/docs/copyright.html.
14 .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 .\" * copies of the Software, and permit persons to whom the Software is
16 .\" * furnished to do so, under the terms of the COPYING file.
18 .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 .\" * KIND, either express or implied.
21 .\" **************************************************************************
23 .TH CURLOPT_HEADERDATA 3 "May 05, 2017" "libcurl 7.59.0" "curl_easy_setopt options"
26 CURLOPT_HEADERDATA \- pointer to pass to header callback
28 #include <curl/curl.h>
30 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HEADERDATA, void *pointer);
32 Pass a \fIpointer\fP to be used to write the header part of the received data
35 If \fICURLOPT_WRITEFUNCTION(3)\fP or \fICURLOPT_HEADERFUNCTION(3)\fP is used,
36 \fIpointer\fP will be passed in to the respective callback.
38 If neither of those options are set, \fIpointer\fP must be a valid FILE * and
39 it will be used by a plain fwrite() to write headers to.
51 static size_t header_callback(char *buffer, size_t size,
52 size_t nitems, void *userdata)
54 struct my_info *i = (struct my_info *)userdata;
56 /* now this callback can access the my_info struct */
61 CURL *curl = curl_easy_init();
63 struct my_info my = { 10, "the cookies are in the cupboard" };
64 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
66 curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, header_callback);
68 /* pass in custom data to the callback */
69 curl_easy_setopt(curl, CURLOPT_HEADERDATA, &my);
71 curl_easy_perform(curl);
79 .BR CURLOPT_HEADERFUNCTION "(3), " CURLOPT_WRITEFUNCTION "(3), "