//http 返回数据回调

static size_t OnWriteData(void* buffer, size_t size, size_t nmemb, void* lpVoid)

{

    std::string* str = dynamic_cast<std::string*>((std::string *)lpVoid);

    if( NULL == str || NULL == buffer )

    {

        return -;

    }  

    char* pData = (char*)buffer;

    str->append(pData, size * nmemb);

    return nmemb;

}  

　　CURL *curl;

    CURLcode res;
　　std::string strResponse;

    curl = curl_easy_init();

    if ( !curl  )

    {

        printf("1\n");

        return -;

    }  

    curl_easy_setopt( curl , CURLOPT_URL ,"http://xxxy.com/xxx.php" );

    curl_easy_setopt( curl , CURLOPT_VERBOSE ,   ) ;

    curl_easy_setopt( curl , CURLOPT_POSTFIELDS , "value1=123&value2=345" );  //php服务器页面可以 echo $_POST["value1"]; 输出对应的值
　　 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, OnWriteData);
　　 curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&strResponse); 

    res = curl_easy_perform(curl);

    if ( res != CURLE_OK )

    {

        printf("error\n");

        return -;

    }

    curl_easy_cleanup(curl);  

char * desUrl = "127.0.0.1/upload.php";

    const char *filePath = "D://110440.jpg"; //文件全路径

    std::string strResponse;

    CURL *curl;

    CURLcode res;

    struct curl_httppost *formpost=NULL;

    struct curl_httppost *lastptr=NULL;

    curl_global_init(CURL_GLOBAL_ALL);

　　/*文件上传表单域填写 */

    curl_formadd(&formpost,

    &lastptr,

    CURLFORM_COPYNAME, "file",  //php 端用 $_FILES["file"]取得文件信息

    CURLFORM_FILE, filePath,

    CURLFORM_END);

　　/* 表单域填写 */

    curl_formadd(&formpost,

        &lastptr,

        CURLFORM_COPYNAME, "value1", //php端用$_POST["value1"] 取得对应值

        CURLFORM_COPYCONTENTS, "",

        CURLFORM_END);

    curl = curl_easy_init();

    if(curl) {

    curl_easy_setopt( curl , CURLOPT_URL ,desUrl );

    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, OnWriteData);

    curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&strResponse);

    curl_easy_setopt(curl, CURLOPT_POST,);

    curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);

    res = curl_easy_perform(curl);

    if(res != CURLE_OK)

        fprintf(stderr, "curl_easy_perform() failed: %s\n",

                curl_easy_strerror(res));

    /* always cleanup */

    curl_easy_cleanup(curl);

    /* then cleanup the formpost chain */

    curl_formfree(formpost);