mirror of
https://github.com/curl/curl.git
synced 2024-12-09 06:30:06 +08:00
82 lines
3.5 KiB
Groff
82 lines
3.5 KiB
Groff
.\" **************************************************************************
|
|
.\" * _ _ ____ _
|
|
.\" * Project ___| | | | _ \| |
|
|
.\" * / __| | | | |_) | |
|
|
.\" * | (__| |_| | _ <| |___
|
|
.\" * \___|\___/|_| \_\_____|
|
|
.\" *
|
|
.\" * Copyright (C) 1998 - 2014, 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 http://curl.haxx.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_XFERINFOFUNCTION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
|
|
.SH NAME
|
|
CURLOPT_XFERINFOFUNCTION \- callback to progress meter function
|
|
.SH SYNOPSIS
|
|
#include <curl/curl.h>
|
|
|
|
int progress_callback(void *clientp,
|
|
curl_off_t dltotal,
|
|
curl_off_t dlnow,
|
|
curl_off_t ultotal,
|
|
curl_off_t ulnow);
|
|
|
|
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_XFERINFOFUNCTION, progress_callback);
|
|
.SH DESCRIPTION
|
|
Pass a pointer to your callback function, which should match the prototype
|
|
shown above.
|
|
|
|
This function gets called by libcurl instead of its internal equivalent with a
|
|
frequent interval. While data is being transferred it will be called very
|
|
frequently, and during slow periods like when nothing is being transferred it
|
|
can slow down to about one call per second.
|
|
|
|
\fIclientp\fP is the pointer set with \fICURLOPT_XFERINFODATA(3)\fP, it is not
|
|
used by libcurl but is only passed along from the application to the callback.
|
|
|
|
The callback gets told how much data libcurl will transfer and has
|
|
transferred, in number of bytes. \fIdltotal\fP is the total number of bytes
|
|
libcurl expects to download in this transfer. \fIdlnow\fP is the number of
|
|
bytes downloaded so far. \fIultotal\fP is the total number of bytes libcurl
|
|
expects to upload in this transfer. \fIulnow\fP is the number of bytes
|
|
uploaded so far.
|
|
|
|
Unknown/unused argument values passed to the callback will be set to zero
|
|
(like if you only download data, the upload size will remain 0). Many times
|
|
the callback will be called one or more times first, before it knows the data
|
|
sizes so a program must be made to handle that.
|
|
|
|
Returning a non-zero value from this callback will cause libcurl to abort the
|
|
transfer and return \fICURLE_ABORTED_BY_CALLBACK\fP.
|
|
|
|
If you transfer data with the multi interface, this function will not be
|
|
called during periods of idleness unless you call the appropriate libcurl
|
|
function that performs transfers.
|
|
|
|
\fICURLOPT_NOPROGRESS(3)\fP must be set to 0 to make this function actually
|
|
get called.
|
|
.SH DEFAULT
|
|
By default, libcurl has an internal progress meter. That's rarely wanted by
|
|
users.
|
|
.SH PROTOCOLS
|
|
All
|
|
.SH EXAMPLE
|
|
http://curl.haxx.se/libcurl/c/progressfunc.html
|
|
.SH AVAILABILITY
|
|
Added in 7.32.0. This callback replaces \fICURLOPT_PROGRESSFUNCTION(3)\fP
|
|
.SH RETURN VALUE
|
|
Returns CURLE_OK.
|
|
.SH "SEE ALSO"
|
|
.BR CURLOPT_XFERINFODATA "(3), " CURLOPT_NOPROGRESS "(3), "
|