An example of how to use libcurl with a client certificate on Windows

libcurl_client_cert.c

#include <iostream>
#include "curl/curl.h"

int main()
{
	CURL* req = curl_easy_init();
	CURLcode res;
	if (req)
	{
		curl_easy_setopt(req, CURLOPT_URL, "certauth.idrix.fr");
		curl_easy_setopt(req, CURLOPT_FOLLOWLOCATION, 1L);
		curl_easy_setopt(req, CURLOPT_SSLCERT, "LocalMachine\\MY\\ee91848df230cec6cd8ce5be2811379f2ae91005");
		curl_easy_setopt(req, CURLOPT_VERBOSE, 1L);
		res = curl_easy_perform(req);
		if (res != CURLE_OK)
		{
			fprintf(stderr, "curl_easy_operation() failed : %s\n", curl_easy_strerror(res));
		}
	}
	curl_easy_cleanup(req);
	return 0;
}