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92 lines
2.8 KiB
Groff
92 lines
2.8 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_HEADERDATA 3 "17 Jun 2014" libcurl libcurl
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.SH NAME
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CURLOPT_HEADERDATA \- pointer to pass to header callback
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HEADERDATA, void *pointer);
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.fi
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.SH DESCRIPTION
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Pass a \fIpointer\fP to be used to write the header part of the received data
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to.
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If \fICURLOPT_WRITEFUNCTION(3)\fP or \fICURLOPT_HEADERFUNCTION(3)\fP is used,
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\fIpointer\fP is passed in to the respective callback.
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If neither of those options are set, \fIpointer\fP must be a valid FILE * and
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it is used by a plain fwrite() to write headers to.
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If you are using libcurl as a win32 DLL, you \fBMUST\fP use a
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\fICURLOPT_WRITEFUNCTION(3)\fP or \fICURLOPT_HEADERFUNCTION(3)\fP if you set
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this option or you might experience crashes.
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.SH DEFAULT
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NULL
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.SH PROTOCOLS
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All
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.SH EXAMPLE
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.nf
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struct my_info {
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int shoesize;
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char *secret;
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};
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static size_t header_callback(char *buffer, size_t size,
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size_t nitems, void *userdata)
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{
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struct my_info *i = userdata;
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printf("shoe size: %d\\n", i->shoesize);
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/* now this callback can access the my_info struct */
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return nitems * size;
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}
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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struct my_info my = { 10, "the cookies are in the cupboard" };
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, header_callback);
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/* pass in custom data to the callback */
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curl_easy_setopt(curl, CURLOPT_HEADERDATA, &my);
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curl_easy_perform(curl);
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}
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}
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.fi
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.SH AVAILABILITY
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Always
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.SH RETURN VALUE
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Returns CURLE_OK
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.SH "SEE ALSO"
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.BR curl_easy_header (3),
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.BR CURLOPT_HEADERFUNCTION (3),
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.BR CURLOPT_WRITEFUNCTION (3)
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