CURLOPT_WRITEFUNCTION

CURLOPT_WRITEFUNCTION is an option in the cURL library, which is used for handling the response data received from a server during an HTTP request. It allows you to specify a callback function that will be called by cURL when it receives data from the server.

The callback function specified by CURLOPT_WRITEFUNCTION should have the following signature:

size_t write_callback(char* ptr, size_t size, size_t nmemb, void* userdata);

The function will be called by cURL repeatedly, passing chunks of data received from the server as arguments. The function should then handle the received data according to the application's needs. The return value of the callback function should be the number of bytes successfully processed.

By using CURLOPT_WRITEFUNCTION, you can customize how cURL handles the received data. For example, you can save it to a file, process it in memory, or display it on the screen.