libcurl增加HTTP header 和 POST之后获取返回数据

libcurl增加HTTP header 和 POST之后获取返回数据
flyfish

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

main函数

    CURL *curl;
    CURLcode res;
    curl_global_init(CURL_GLOBAL_ALL);
    curl = curl_easy_init();
    if (curl) {

        curl_easy_setopt(curl, CURLOPT_URL, "http://www.example.com");
        struct curl_slist *headers = NULL;

        //增加HTTP header
        headers = curl_slist_append(headers, "Accept:application/json");
        headers = curl_slist_append(headers, "Content-Type:application/json");
        headers = curl_slist_append(headers, "charset:utf-8");

        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "post的内容");


        static const char *pagefilename = "respone.txt";
        FILE *pagefile;

        //写入到文件
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);


        fopen_s(&pagefile,pagefilename, "wb");
        if (pagefile) 
        {

            curl_easy_setopt(curl, CURLOPT_WRITEDATA, pagefile);        
            res = curl_easy_perform(curl);
            if (res != CURLE_OK)
            {
                fprintf(stderr, "curl_easy_perform() failed: %s\n",curl_easy_strerror(res));
            }
            fclose(pagefile);

        }
        curl_easy_cleanup(curl);
    }
    curl_global_cleanup();