Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_HEADERDATA.3 @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
parents b50eed0cc0ef
children
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1 .\" **************************************************************************
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2 .\" * _ _ ____ _
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3 .\" * Project ___| | | | _ \| |
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4 .\" * / __| | | | |_) | |
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5 .\" * | (__| |_| | _ <| |___
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6 .\" * \___|\___/|_| \_\_____|
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7 .\" *
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8 .\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 .\" *
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10 .\" * This software is licensed as described in the file COPYING, which
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11 .\" * you should have received as part of this distribution. The terms
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12 .\" * are also available at https://curl.haxx.se/docs/copyright.html.
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13 .\" *
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14 .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 .\" * copies of the Software, and permit persons to whom the Software is
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16 .\" * furnished to do so, under the terms of the COPYING file.
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17 .\" *
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18 .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 .\" * KIND, either express or implied.
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20 .\" *
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21 .\" **************************************************************************
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22 .\"
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23 .TH CURLOPT_HEADERDATA 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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24 .SH NAME
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25 CURLOPT_HEADERDATA \- pointer to pass to header callback
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26 .SH SYNOPSIS
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27 #include <curl/curl.h>
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28
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29 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HEADERDATA, void *pointer);
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30 .SH DESCRIPTION
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31 Pass a \fIpointer\fP to be used to write the header part of the received data
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32 to.
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33
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34 If \fICURLOPT_WRITEFUNCTION(3)\fP or \fICURLOPT_HEADERFUNCTION(3)\fP is used,
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35 \fIpointer\fP will be passed in to the respective callback.
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36
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37 If neither of those options are set, \fIpointer\fP must be a valid FILE * and
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38 it will be used by a plain fwrite() to write headers to.
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39 .SH DEFAULT
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40 NULL
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41 .SH PROTOCOLS
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42 All
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43 .SH EXAMPLE
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44 .nf
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45 struct my_info {
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46 int shoesize;
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47 char *secret;
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48 };
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49
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50 static size_t header_callback(char *buffer, size_t size,
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51 size_t nitems, void *userdata)
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52 {
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53 struct my_info *i = (struct my_info *)userdata;
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54
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55 /* now this callback can access the my_info struct */
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56
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57 return nitems * size;
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58 }
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59
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60 CURL *curl = curl_easy_init();
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61 if(curl) {
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62 struct my_info my = { 10, "the cookies are in the cupboard" };
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63 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
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64
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65 curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, header_callback);
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66
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67 /* pass in custom data to the callback */
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68 curl_easy_setopt(curl, CURLOPT_HEADERDATA, &my);
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69
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70 curl_easy_perform(curl);
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71 }
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72 .fi
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73 .SH AVAILABILITY
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74 Always
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75 .SH RETURN VALUE
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76 Returns CURLE_OK
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77 .SH "SEE ALSO"
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78 .BR CURLOPT_HEADERFUNCTION "(3), " CURLOPT_WRITEFUNCTION "(3), "