libcurl使用实例2：回调函数使用

libcurl使用实例2：回调函数使用

#include <curl/curl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
size_t write_data(void* buffer, size_t size, size_t nmemb, FILE* file) {
    size_t r_size = fwrite(buffer, size, nmemb, file);
    return r_size;
}
int main() {
    /*定义一个只读的文件指针*/
    char* path = "path.txt";
    FILE* file = fopen(path, "w");
    /*初始化环境*/
    CURL* curl;
    CURLcode res;
    curl_global_init(CURL_GLOBAL_ALL);
    curl = curl_easy_init();
    if (curl) {
        curl_easy_setopt(curl, CURLOPT_URL,
                         "https://www.youkuaiyun.com/"); //-url
        /*回调函数调用*/
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, file);
    }
    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;
}

输出：