66 lines
2.6 KiB
Groff
66 lines
2.6 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_WRITEDATA 3 "16 Jun 2014" libcurl libcurl
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.SH NAME
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CURLOPT_WRITEDATA \- pointer passed to the write 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_WRITEDATA, void *pointer);
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.fi
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.SH DESCRIPTION
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A data \fIpointer\fP to pass to the write callback. If you use the
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\fICURLOPT_WRITEFUNCTION(3)\fP option, this is the pointer you get in that
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callback's fourth and last argument. If you do not use a write callback, you
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must make \fIpointer\fP a 'FILE *' (cast to 'void *') as libcurl passes this
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to \fIfwrite(3)\fP when writing data.
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The internal \fICURLOPT_WRITEFUNCTION(3)\fP writes the data to the FILE *
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given with this option, or to stdout if this option has not been set.
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If you are using libcurl as a Windows DLL, you \fBMUST\fP use a
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\fICURLOPT_WRITEFUNCTION(3)\fP if you set this option or you might experience
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crashes.
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.SH DEFAULT
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By default, this is a FILE * to stdout.
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.SH PROTOCOLS
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Used for all protocols.
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.SH EXAMPLE
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A common technique is to use the write callback to store the incoming data
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into a dynamically growing allocated buffer, and then this
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\fICURLOPT_WRITEDATA(3)\fP is used to point to a struct or the buffer to store
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data in. Like in the getinmemory example:
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https://curl.se/libcurl/c/getinmemory.html
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.SH AVAILABILITY
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Available in all libcurl versions. This option was formerly known as
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CURLOPT_FILE, the name \fICURLOPT_WRITEDATA(3)\fP was added in 7.9.7.
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.SH RETURN VALUE
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This returns CURLE_OK.
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.SH "SEE ALSO"
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.BR CURLOPT_WRITEFUNCTION (3),
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.BR CURLOPT_HEADERDATA (3),
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.BR CURLOPT_READDATA (3)
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