Provided by: libcurl4-doc_7.55.1-1ubuntu2_all bug

NAME

       CURLOPT_WRITEDATA - custom 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 CURLOPT_WRITEFUNCTION(3)
       option, this is the pointer you'll get in that callback's 4th argument. If you don't 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 hasn't been set.

       If  you're  using libcurl as a win32 DLL, you MUST use the CURLOPT_WRITEFUNCTION(3) if you
       set this option or you will 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 CURLOPT_WRITEDATA(3) is used to point
       to  a  struct  or  the  buffer  to  store  data  in.  Like  in  the  getinmemory  example:
       https://curl.haxx.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 introduced in 7.9.7.

RETURN VALUE

       This will return CURLE_OK.

SEE ALSO

       CURLOPT_WRITEFUNCTION(3), CURLOPT_READDATA(3),