cURL是否将打印传输到控制台?

时间:2019-07-02 08:40:32

标签: c++ curl libcurl

我的应用程序将打印响应正文保留在控制台中。而没有cout之类的函数或我放入代码内的类似函数。真奇怪。

#include <iostream>
#include <curl.h>

#pragma comment(lib, "libcurldll.lib");

int main() {
    CURL* curl = curl_easy_init();

    curl_easy_setopt(curl, CURLOPT_URL, "url");
    curl_easy_setopt(curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36");
    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);

    curl_easy_perform(curl);
    curl_easy_cleanup(curl);

    return 0;
}

1 个答案:

答案 0 :(得分:0)

根据the documentation,libcurl的默认行为是使用stdout将响应写出到fwrite

您将需要像这样覆盖CURLOPT_WRITEFUNCTION

size_t my_write_callback(char *ptr, size_t size, size_t nmemb, void *userdata) {
    cout << "Received " << nmemb << " bytes" << endl;
    return nmemb;
}

curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, my_write_callback);

您可以通过更改CURLOPT_WRITEDATA来控制userdata的值,默认情况下它等于stdout

编辑:使用std::string作为内存缓冲区的简单示例:

size_t my_write_callback(char *ptr, size_t size, size_t nmemb, void *userdata) {
    static_cast<std::string*>(userdata)->append((char*) ptr, size * nmemb);
    return nmemb;
}

std::string buf;
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, my_write_callback);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buf);
curl_easy_perform(curl);
// do something with buf