CURLOPT_WRITEDATA(3)

CURLOPT_WRITEDATA(3)curl_easy_setopt options CURLOPT_WRITEDATA(3)

NAME

     CURLOPT_WRITEDATA - custom pointer passed to the write call-
     back

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  writ-
     ing 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 getin-
     memory                                              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),

libcurl 7.58.0   Last change: February 03, 2016                 1