CURLOPT_WRITEDATA - pointer passed to the write callback
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_WRITEDATA, void *pointer);
A data
pointer to pass to the write callback. If you use the
CURLOPT_WRITEFUNCTION(3) option, this is the pointer you will get in
that callback's fourth and last argument. If you do not use a write callback,
you must make
pointer a 'FILE *' (cast to 'void *') as libcurl will
pass this to
fwrite(3) when writing data.
The internal
CURLOPT_WRITEFUNCTION(3) 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
MUST use a
CURLOPT_WRITEFUNCTION(3) if you set this option or you will experience
crashes.
By default, this is a FILE * to stdout.
Used for all protocols.
A common technique is to use the write callback to store the incoming data into
a dynamically growing allocated buffer, and then this
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
Available in all libcurl versions. This option was formerly known as
CURLOPT_FILE, the name was introduced in
7.9.7.
This will return CURLE_OK.
CURLOPT_WRITEFUNCTION(3),
CURLOPT_READDATA(3),