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    // demo.cpp : 定义控制台应用程序的入口点。
    //
    
    #include "stdafx.h"
    #include "curl/curl.h"
    #pragma comment(lib, "libcurl.lib")
    //curl 回调函数
    static size_t write_buff_data(char *buffer, size_t size, size_t nitems, void *outstream)
    {
        memcpy(outstream, buffer, nitems*size);
        return nitems*size;
    }
    
    /*
    使用http代理
    */
    int GetUrlHTTP(char *url, char *buff)
    {
        CURL *curl;
        CURLcode res;
        curl = curl_easy_init();
        if (curl)
        {
            curl_easy_setopt(curl, CURLOPT_PROXY,"http://代理服务器地址:端口");//设置http代理地址
            curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, "认证账户名:认证账户密码");//认证账户名及密码，以":"分隔
            curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*)buff);//设置读写缓存
            curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_buff_data);//设置回调函数
            curl_easy_setopt(curl, CURLOPT_URL, url);//设置url地址
            curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, 10L);//设置一个长整形数，控制多少秒传送CURLOPT_LOW_SPEED_LIMIT规定的字节数
            curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, 50L);//设置一个长整形数,控制传送多少字节
            curl_easy_setopt(curl, CURLOPT_MAX_RECV_SPEED_LARGE, 2000000L);//下载最高速度
    
            res = curl_easy_perform(curl);
            curl_easy_cleanup(curl);
            if (res == CURLE_OK){
                return res;
            }else {
                printf("错误代码:%d\n", res);
                MessageBox(NULL, TEXT("获取IP错误"), TEXT("助手"), MB_ICONINFORMATION | MB_YESNO);
            }
        }
        return res;
    }
    /*
    使用socks5代理
    */
    int GetUrlSocks5(char *url, char *buff)
    {
        CURL *curl;
        CURLcode res;
        curl = curl_easy_init();
        if (curl)
        {
            curl_easy_setopt(curl, CURLOPT_PROXY, "socks5://代理服务器地址:端口");//设置socks5代理地址
            curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, "认证账户名:认证账户密码");//认证账户名及密码，以":"分隔
            curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*)buff);//设置读写缓存
            curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_buff_data);//设置回调函数
            curl_easy_setopt(curl, CURLOPT_URL, url);//设置url地址
            curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, 10L);//设置一个长整形数，控制多少秒传送CURLOPT_LOW_SPEED_LIMIT规定的字节数
            curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, 50L);//设置一个长整形数,控制传送多少字节;
            curl_easy_setopt(curl, CURLOPT_MAX_RECV_SPEED_LARGE, 2000000L);/*下载最高速度*/
            res = curl_easy_perform(curl);
            curl_easy_cleanup(curl);
            if (res == CURLE_OK) {
                return res;
            }
            else {
                printf("错误代码:%d\n", res);
                MessageBox(NULL, TEXT("获取IP错误"), TEXT("助手"), MB_ICONINFORMATION | MB_YESNO);
            }
        }
        return res;
    }
    /*
    不使用代理
    */
    int GetUrl(char *url, char *buff)
    {
        CURL *curl;
        CURLcode res;
        //使用的curl库 初始化curl库
        curl = curl_easy_init();
        if (curl)
        {
            curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*)buff);//设置读写缓存
            curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_buff_data);//设置回调函数
            curl_easy_setopt(curl, CURLOPT_URL, url);//设置url地址
            curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, 10L);//设置一个长整形数，控制多少秒传送CURLOPT_LOW_SPEED_LIMIT规定的字节数
            curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, 50L);//设置一个长整形数,控制传送多少字节
            curl_easy_setopt(curl, CURLOPT_MAX_RECV_SPEED_LARGE, 2000000L);/*下载最高速度*/
            res = curl_easy_perform(curl);
            curl_easy_cleanup(curl);
            if (res == CURLE_OK)
            {
                return res;
            }
            else {
                printf("错误代码:%d\n", res);
                MessageBox(NULL, TEXT("获取IP错误"), TEXT("助手"), MB_ICONINFORMATION | MB_YESNO);
            }
        }
        return res;
    }
    int main()
    {
        char *buff=(char*)malloc(1024*1024);
        memset(buff, 0, 1024 * 1024);
        //不使用http代理
        GetUrl("http://myip.top", buff);
        printf("不使用代理：%s\n", buff);
        //使用http代理
        memset(buff, 0, 1024 * 1024);
        GetUrlHTTP("http://ipinfo.io", buff);
        printf("http结果：%s\n", buff);
        //使用socks5代理
        memset(buff, 0,1024 * 1024);
        GetUrlSocks5("http://ipinfo.io", buff);
        printf("socks5结果：%s\n", buff);
    
        free(buff);
        Sleep(10 * 1000);//等待10秒退出
        
        return 0;
    }