Вы не можете выбрать более 25 тем
Темы должны начинаться с буквы или цифры, могут содержать дефисы(-) и должны содержать не более 35 символов.
64 строки
2.6 KiB
Groff
64 строки
2.6 KiB
Groff
.\" **************************************************************************
|
|
.\" * _ _ ____ _
|
|
.\" * Project ___| | | | _ \| |
|
|
.\" * / __| | | | |_) | |
|
|
.\" * | (__| |_| | _ <| |___
|
|
.\" * \___|\___/|_| \_\_____|
|
|
.\" *
|
|
.\" * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
|
|
.\" *
|
|
.\" * This software is licensed as described in the file COPYING, which
|
|
.\" * you should have received as part of this distribution. The terms
|
|
.\" * are also available at https://curl.se/docs/copyright.html.
|
|
.\" *
|
|
.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
|
|
.\" * copies of the Software, and permit persons to whom the Software is
|
|
.\" * furnished to do so, under the terms of the COPYING file.
|
|
.\" *
|
|
.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
.\" * KIND, either express or implied.
|
|
.\" *
|
|
.\" **************************************************************************
|
|
.\"
|
|
.TH CURLOPT_WRITEDATA 3 "November 26, 2021" "libcurl 7.83.1" "curl_easy_setopt options"
|
|
|
|
.SH NAME
|
|
CURLOPT_WRITEDATA \- pointer passed to the write callback
|
|
.SH SYNOPSIS
|
|
.nf
|
|
#include <curl/curl.h>
|
|
|
|
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_WRITEDATA, void *pointer);
|
|
.fi
|
|
.SH DESCRIPTION
|
|
A data \fIpointer\fP to pass to the write callback. If you use the
|
|
\fICURLOPT_WRITEFUNCTION(3)\fP option, this is the pointer you will get in that
|
|
callback's 4th argument. If you do not use a write callback, you must make
|
|
\fIpointer\fP a 'FILE *' (cast to 'void *') as libcurl will pass this to
|
|
\fIfwrite(3)\fP when writing data.
|
|
|
|
The internal \fICURLOPT_WRITEFUNCTION(3)\fP will write the data to the FILE *
|
|
given with this option, or to stdout if this option has not been set.
|
|
|
|
If you are using libcurl as a win32 DLL, you \fBMUST\fP use a
|
|
\fICURLOPT_WRITEFUNCTION(3)\fP if you set this option or you will experience
|
|
crashes.
|
|
.SH DEFAULT
|
|
By default, this is a FILE * to stdout.
|
|
.SH PROTOCOLS
|
|
Used for all protocols.
|
|
.SH EXAMPLE
|
|
A common technique is to use the write callback to store the incoming data
|
|
into a dynamically growing allocated buffer, and then this
|
|
\fICURLOPT_WRITEDATA(3)\fP is used to point to a struct or the buffer to store
|
|
data in. Like in the getinmemory example:
|
|
https://curl.se/libcurl/c/getinmemory.html
|
|
.SH AVAILABILITY
|
|
Available in all libcurl versions. This option was formerly known as
|
|
\fICURLOPT_FILE\fP, the name \fICURLOPT_WRITEDATA(3)\fP was introduced in
|
|
7.9.7.
|
|
.SH RETURN VALUE
|
|
This will return CURLE_OK.
|
|
.SH "SEE ALSO"
|
|
.BR CURLOPT_WRITEFUNCTION "(3), " CURLOPT_READDATA "(3), "
|