curl文件只包含0而不是html

Question

我尝试从google.de获取一些HTML代码，这很好用。 另外我的printf将代码打印到控制台中，但文件只包含“0”而不是“hmtl代码”。

int main()
{
    CURL *curl;
    CURLcode res;
    FILE *file;

    file = fopen("/Users/xxx/Desktop/html.txt","a+");

    curl = curl_easy_init();
    if(curl) {
        curl_easy_setopt(curl, CURLOPT_URL, "https://www.google.de/search?client=safari&rls=en&q=wetter+paderborn&ie=UTF-8&oe=UTF-8&gws_rd=cr&ei=eNWRUr7xGtPY4QS5rYD4Cw#q=wetter+paderborn&rls…");
        res = curl_easy_perform(curl);

        printf("%u",res);
        fprintf(file,"%u",res);
        curl_easy_cleanup(curl);
        fclose(file);
    }
}