编辑“︁C 语言网络库使用”︁（章节）

=== libcurl使用示例 ===
libcurl是一个强大的HTTP客户端库，支持多种协议（HTTP/HTTPS/FTP等）。

<syntaxhighlight lang="c">
#include <stdio.h>
#include <curl/curl.h>

size_t write_callback(void *contents, size_t size, size_t nmemb, void *userp) {
    size_t realsize = size * nmemb;
    printf("%.*s", (int)realsize, (char *)contents);
    return realsize;
}

int main(void) {
    CURL *curl;
    CURLcode res;

    curl_global_init(CURL_GLOBAL_DEFAULT);
    curl = curl_easy_init();

    if(curl) {
        curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);

        res = curl_easy_perform(curl);
        if(res != CURLE_OK)
            fprintf(stderr, "curl_easy_perform() failed: %s\n",
                    curl_easy_strerror(res));

        curl_easy_cleanup(curl);
    }

    curl_global_cleanup();
    return 0;
}
</syntaxhighlight>