x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
CURLOPT_WRITEDATA(3) libcurl CURLOPT_WRITEDATA(3)
NAME
CURLOPT_WRITEDATA - pointer passed to the write callback
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_WRITEDATA, void *pointer);
DESCRIPTION
A data pointer to pass to the write callback. If you use the CUR-
LOPT_WRITEFUNCTION(3) option, this is the pointer you get in that call-
back's fourth and last argument. If you do not use a write callback,
you must make pointer a 'FILE *' (cast to 'void *') as libcurl passes
this to fwrite(3) when writing data.
The internal CURLOPT_WRITEFUNCTION(3) writes 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 Windows DLL, you MUST use a CUR-
LOPT_WRITEFUNCTION(3) if you set this option or you might experience
crashes.
DEFAULT
By default, this is a FILE * to stdout.
PROTOCOLS
Used for all protocols.
EXAMPLE
A common technique is to use the write callback to store the incoming
data into a dynamically growing allocated buffer, and then this CUR-
LOPT_WRITEDATA(3) 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
AVAILABILITY
Available in all libcurl versions. This option was formerly known as
CURLOPT_FILE, the name CURLOPT_WRITEDATA(3) was added in 7.9.7.
RETURN VALUE
This returns CURLE_OK.
SEE ALSO
CURLOPT_WRITEFUNCTION(3), CURLOPT_HEADERDATA(3), CURLOPT_READDATA(3)
ibcurl 8.4.0 September 27, 2023 CURLOPT_WRITEDATA(3)
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