NAME

CURLOPT_CHUNK_DATA - pointer passed to the FTP chunk callbacks

SYNOPSIS

#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CHUNK_DATA, void *pointer);

DESCRIPTION

Pass a pointer that is untouched by libcurl and passed as the ptr argument to the CURLOPT_CHUNK_BGN_FUNCTION(3) and CURLOPT_CHUNK_END_FUNCTION(3).

DEFAULT

NULL

PROTOCOLS

FTP

EXAMPLE

#include <stdio.h>
struct callback_data {


   FILE *output;
};
static long file_is_coming(struct curl_fileinfo *finfo,


                           void *ptr,


                           int remains)
{


  struct callback_data *data = ptr;


  printf("%3d %40s %10luB ", remains, finfo->filename,


         (unsigned long)finfo->size);


  switch(finfo->filetype) {


  case CURLFILETYPE_DIRECTORY:


    printf(" DIR\n");


    break;


  case CURLFILETYPE_FILE:


    printf("FILE ");


    break;


  default:


    printf("OTHER\n");


    break;


  }


  if(finfo->filetype == CURLFILETYPE_FILE) {


    /* do not transfer files >= 50B */


    if(finfo->size > 50) {


      printf("SKIPPED\n");


      return CURL_CHUNK_BGN_FUNC_SKIP;


    }


    data->output = fopen(finfo->filename, "wb");


    if(!data->output) {


      return CURL_CHUNK_BGN_FUNC_FAIL;


    }


  }


  return CURL_CHUNK_BGN_FUNC_OK;
}
int main()
{


  /* data for callback */


  struct callback_data callback_info;


  CURL *curl = curl_easy_init();


  /* callback is called before download of concrete file started */


  curl_easy_setopt(curl, CURLOPT_CHUNK_BGN_FUNCTION, file_is_coming);


  curl_easy_setopt(curl, CURLOPT_CHUNK_DATA, &callback_info);
}

AVAILABILITY

Added in 7.21.0

RETURN VALUE

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.