curl/libcurl获取打开网页平均网速

CURL:

curl -o /dev/null -s -w %{http_code}:%{http_connect}:%{content_type}:%{time_namelookup}:%{time_redirect}:%{time_pretransfer}:%{time_connect}:%{time_starttransfer}:%{time_total}:%{speed_download} baidu.com

LIBCURL:

size_t WriteCallback(void *ptr, size_t size, size_t nmemb, void *data)
{
    /* we are not interested in the downloaded bytes itself,
    so we only return the size we would have saved ... */
    (void)ptr;  /* unused */
    (void)data; /* unused */
    return (size_t)(size * nmemb);
}

//获取下载网速
float GetDownloadSpeed(const string &strURL) {
#define CHKSPEED_VERSION "1.0"
    CURL *curl = curl_easy_init();
    float fNetSpeed = -;
    if (curl) {
        curl_easy_setopt(curl, CURLOPT_URL, strURL.c_str());
        /* send all data to this function  */
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
        if (strURL.find("https:") != string::npos) {
           curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
           curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
        }

        /* some servers don't like requests that are made without a user-agent
        field, so we provide one */
        curl_easy_setopt(curl, CURLOPT_USERAGENT,
            "libcurl-speedchecker/" CHKSPEED_VERSION);
        /* Perform the request */
        CURLcode res = curl_easy_perform(curl);
        if (!res) {
            double speed;
            res = curl_easy_getinfo(curl, CURLINFO_SPEED_DOWNLOAD, &speed);
            if (!res) {
                fNetSpeed = speed / 1024.0;//kbyte/sec
            }
        }
    }
    /* cleanup curl stuff */
    curl_easy_cleanup(curl);
    return fNetSpeed;
}

参考资料：

https://curl.haxx.se/libcurl/c/chkspeed.html