基于libcurl实现自己的http类

get post 上传文件 下载文件~~~~

CURLcode PostContentJson(const string & strUrl, const string & httpHead, const string & strPost, long timeout, string & strResponse)
{
    CURLcode res;
    CURL* curl = curl_easy_init();
    if(NULL == curl)
    {
        return CURLE_FAILED_INIT;
    }
    
    struct curl_slist *head = NULL;
    //head = curl_slist_append(head, httpHead.c_str());
    
    //逐个添加
    string strHead = httpHead;
    string strUserAgent = strHead.substr(0, strHead.find_first_of("\n"));
    strHead = strHead.substr(strHead.find_first_of("\n") + 1);
    string strContentType = strHead.substr(0, strHead.find_first_of("\n"));
    strHead = strHead.substr(strHead.find_first_of("\n") + 1);
    string strCookie = strHead.substr(0, strHead.find_first_of("\n"));

    head = curl_slist_append(head, strUserAgent.c_str());
    head = curl_slist_append(head, strContentType.c_str());
    head = curl_slist_append(head, strCookie.c_str());
    //********
        
    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, head);
    curl_easy_setopt(curl, CURLOPT_URL, strUrl.c_str());
    curl_easy_setopt(curl, CURLOPT_FORBID_REUSE, 1);
    curl_easy_setopt(curl, CURLOPT_POST, 1);
    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, strPost.c_str());
    curl_easy_setopt(curl, CURLOPT_READFUNCTION, NULL);
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeCallback);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&strResponse);
    curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);  
    curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, timeout);
    curl_easy_setopt(curl, CURLOPT_TIMEOUT, 30);
    curl_easy_setopt(curl, CURLOPT_USERAGENT, "1.0.0.1");
    res = curl_easy_perform(curl);
    curl_slist_free_all(head);
    curl_easy_cleanup(curl);
    return res;
}