c 上传文件到云服务器

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>

static size_t WriteCallback(void *contents, size_t size, size_t nmemb, void *userp) {
    // 处理服务器响应
    return size * nmemb;
}

int main(void) {
    CURL *curl;
    CURLcode res;
    struct stat file_info;
    FILE *fd;

    curl_global_init(CURL_GLOBAL_DEFAULT);
    curl = curl_easy_init();
    if(curl) {
        fd = fopen("example.txt", "rb"); /* 打开要上传的文件 */
        if(!fd) {
            perror("fopen");
            return 1;
        }
        fseek(fd, 0, SEEK_END);
        file_info.st_size = ftell(fd);
        fseek(fd, 0, SEEK_SET);

        curl_easy_setopt(curl, CURLOPT_URL, "http://yourserver.com/upload");
        curl_easy_setopt(curl, CURLOPT_POST, 1L);
        curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE_LARGE, (curl_off_t)file_info.st_size);
        curl_easy_setopt(curl, CURLOPT_READFUNCTION, NULL);
        curl_easy_setopt(curl, CURLOPT_READDATA, fd);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, stdout);

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

        fclose(fd);
        curl_easy_cleanup(curl);
    }
    curl_global_cleanup();
    return 0;
}