libcurl_examples.c

#include <stdio.h>

#include <curl/curl.h>


/* ===== HELPER FUNCTIONS ================================================= */

static size_t writeToFile(void *ptr, size_t size, size_t nmemb, FILE *stream) {
	size_t written;
	written = fwrite(ptr, size, nmemb, stream);
	return written;
}


/* ===== EXAMPLES ========================================================= */

/* Download a file from `url` and write it to a file named `fname`.
   Returns NULL on success and an error message on failure.         */
const char *downloadFile(const char *url, const char *fname) {
	CURL *curl;
	FILE *fp;
	CURLcode res;

	if ((curl = curl_easy_init()) && (fp = fopen(fname, "wb"))) {
		curl_easy_setopt(curl, CURLOPT_URL, url);
		curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
		curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
		res = curl_easy_perform(curl);
	}

	if (curl) {
		curl_easy_cleanup(curl);
	}

	if (fp) {
		fclose(fp);
	}
	
	return res == CURL_OK ? NULL : curl_easy_strerror(res);
}