CURLOPT_HEADERDATA(3)

CURLOPT_HEADERDATA(3)curl_easy_setopt optionCURLOPT_HEADERDATA(3)

NAME

     CURLOPT_HEADERDATA - pointer to pass to header callback

SYNOPSIS

     #include <curl/curl.h>

     CURLcode curl_easy_setopt(CURL *handle,  CURLOPT_HEADERDATA,
     void *pointer);

DESCRIPTION

     Pass a pointer to be used to write the header  part  of  the
     received data to.

     If CURLOPT_WRITEFUNCTION(3) or CURLOPT_HEADERFUNCTION(3)  is
     used, pointer will be passed in to the respective callback.

     If neither of those options are set, pointer must be a valid
     FILE  *  and  it  will  be used by a plain fwrite() to write
     headers to.

DEFAULT

     NULL

PROTOCOLS

     All

EXAMPLE

     struct my_info {
       int shoesize;
       char *secret;
     };

     static size_t header_callback(char *buffer, size_t size,
                                   size_t nitems, void *userdata)
     {
       struct my_info *i = (struct my_info *)userdata;

       /* now this callback can access the my_info struct */

       return nitems * size;
     }

     CURL *curl = curl_easy_init();
     if(curl) {
       struct my_info my = { 10, "the cookies are in the cupboard" };
       curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");

       curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, header_callback);

       /* pass in custom data to the callback */
       curl_easy_setopt(curl, CURLOPT_HEADERDATA, &my);

libcurl 7.58.0      Last change: May 05, 2017                   1

CURLOPT_HEADERDATA(3)curl_easy_setopt optionCURLOPT_HEADERDATA(3)

       curl_easy_perform(curl);
     }

AVAILABILITY

     Always

RETURN VALUE

     Returns CURLE_OK

SEE ALSO

     CURLOPT_HEADERFUNCTION(3), CURLOPT_WRITEFUNCTION(3),

libcurl 7.58.0      Last change: May 05, 2017                   2