libcURL 在QT中的使用

int getWeather::useCurl(){
    if(_area_Str.isNull())
    {
        return 0;
    }
    QString url = "http://apis.baidu.com/showapi_open_bus/weather_showapi/address"+_area_Str;
    QByteArray ba ;
    ba = url.toLocal8Bit();
    char * m_url = ba.data();




    CURL *curl;
    CURLcode res;
    /* In windows, this will init the winsock stuff */
    curl_global_init(CURL_GLOBAL_ALL);
    curl = curl_easy_init();

    struct curl_slist *headers = NULL;
    headers = curl_slist_append(headers, "apikey: xxxxxxxxxxxxxxxxxxx");
    if(curl) {
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);// 改协议头
        curl_easy_setopt(curl, CURLOPT_URL, m_url);

        /* example.com is redirected, so we tell libcurl to follow redirection */
         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);


        char buffer[4096] = {0x0};
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, buffer);

        /* Perform the request, res will get the return code */
        res = curl_easy_perform(curl);
        /* Check for errors */
        if(res != CURLE_OK)
            fprintf(stderr, "curl_easy_perform() failed: %s\n",
                    curl_easy_strerror(res));

        /* always cleanup */
        curl_easy_cleanup(curl);
       // qDebug()<<chunk.memory;



        curl_global_cleanup();
        return 1;
    }
    return 0;
}