Manpages - CURLOPT_READDATA.3

CURLOPT_READDATA - pointer passed to the read callback

#include <curl/curl.h>

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

Data pointer to pass to the file read function. If you use the CURLOPT_READFUNCTION(3) option, this is the pointer you will get as input in the 4th argument to the callback.

If you do not specify a read callback but instead rely on the default internal read function, this data must be a valid readable FILE * (cast to ’void *’).

If you are using libcurl as a win32 DLL, you MUST use a CURLOPT_READFUNCTION(3) if you set this option or you will experience crashes.

By default, this is a FILE * to stdin.

This is used for all protocols when sending data.

  CURL *curl = curl_easy_init();
  struct MyData this;
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

    /* pass pointer that gets passed in to the
       CURLOPT_READFUNCTION callback */
    curl_easy_setopt(curl, CURLOPT_READDATA, &this);

    curl_easy_perform(curl);
  }

This option was once known by the older name CURLOPT_INFILE, the name CURLOPT_READDATA(3) was introduced in 7.9.7.

This will return CURLE_OK.

*CURLOPT_READFUNCTION*(3), *CURLOPT_WRITEDATA*(3),