C++ 请求http代理

一开始使用winhttp....但是！实在是找不到资料也不知道要怎么设置，感觉哪个文档都有点看不懂
最后采用socket设置代理
网上搜了一圈各种都有就是不能用！
最后看到两个不错的博主
决定参考着自己写！
要使用的时候记得改下代理IP端口账密~
参考了这两个作者的：
https://blog.csdn.net/bodybo/article/details/7274865
https://blog.csdn.net/yu1121jm/article/details/85132224
我的代码记得改下账密哦我等下再改个完善版本的出来
#include <cstdio>
#include <string>
#include <iostream>
#include <algorithm>
#include <Winsock2.h>
#include <Ws2tcpip.h> 
#pragma comment(lib, "Ws2_32.lib")
using namespace std;

#define     USE_PROXY       1 //是否使用代理
#define     PROXY_ADDR      "42.101.45.83" //代理IP
#define     PROXY_PORT      22807 //代理端口

//把username:password 转成 Base64  比如 D5565507:568FD2320185转化成RDU1NjU1MDc6NTY4RkQyMzIwMTg1
string Encode(const unsigned char* Data, int DataByte)
{
    //编码表
    const char EncodeTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    //返回值
    string strEncode;
    unsigned char Tmp[4] = { 0 };
    int LineLength = 0;
    for (int i = 0; i < (int)(DataByte / 3); i++)
    {
        Tmp[1] = *Data++;
        Tmp[2] = *Data++;
        Tmp[3] = *Data++;
        strEncode += EncodeTable[Tmp[1] >> 2];
        strEncode += EncodeTable[((Tmp[1] << 4) | (Tmp[2] >> 4)) & 0x3F];
        strEncode += EncodeTable[((Tmp[2] << 2) | (Tmp[3] >> 6)) & 0x3F];
        strEncode += EncodeTable[Tmp[3] & 0x3F];
        if (LineLength += 4, LineLength == 76) { strEncode += "
"; LineLength = 0; }
    }
    //对剩余数据进行编码
    int Mod = DataByte % 3;
    if (Mod == 1)
    {
        Tmp[1] = *Data++;
        strEncode += EncodeTable[(Tmp[1] & 0xFC) >> 2];
        strEncode += EncodeTable[((Tmp[1] & 0x03) << 4)];
        strEncode += "==";
    }
    else if (Mod == 2)
    {
        Tmp[1] = *Data++;
        Tmp[2] = *Data++;
        strEncode += EncodeTable[(Tmp[1] & 0xFC) >> 2];
        strEncode += EncodeTable[((Tmp[1] & 0x03) << 4) | ((Tmp[2] & 0xF0) >> 4)];
        strEncode += EncodeTable[((Tmp[2] & 0x0F) << 2)];
        strEncode += "=";
    }

    return strEncode;
}

//把 Base64 转成 username:password 比如 RDU1NjU1MDc6NTY4RkQyMzIwMTg1转化成D5565507:568FD2320185
string Decode(const char* Data, int DataByte, int& OutByte)
{
    //解码表
    const char DecodeTable[] =
    {
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        62, // '+'
        0, 0, 0,
        63, // '/'
        52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // '0'-'9'
        0, 0, 0, 0, 0, 0, 0,
        0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
        13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // 'A'-'Z'
        0, 0, 0, 0, 0, 0,
        26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
        39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // 'a'-'z'
    };
    //返回值
    string strDecode;
    int nValue;
    int i = 0;
    while (i < DataByte)
    {
        if (*Data != '
' && *Data != '
')
        {
            nValue = DecodeTable[*Data++] << 18;
            nValue += DecodeTable[*Data++] << 12;
            strDecode += (nValue & 0x00FF0000) >> 16;
            OutByte++;
            if (*Data != '=')
            {
                nValue += DecodeTable[*Data++] << 6;
                strDecode += (nValue & 0x0000FF00) >> 8;
                OutByte++;
                if (*Data != '=')
                {
                    nValue += DecodeTable[*Data++];
                    strDecode += nValue & 0x000000FF;
                    OutByte++;
                }
            }
            i += 4;
        }
        else// 回车换行,跳过
        {
            Data++;
            i++;
        }
    }
    return strDecode;
}

#if USE_PROXY
SOCKET _connect(const char* addr, unsigned short port)
#else
SOCKET _connect(struct in_addr* addr, unsigned short port)
#endif
{
    SOCKET sockfd = INVALID_SOCKET;
    struct sockaddr_in sin = { 0 };
    int ret = 0;

    sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (INVALID_SOCKET == sockfd)
    {
        printf("socket failed.
");
        return sockfd;
    }

    sin.sin_family = AF_INET;
    sin.sin_port = htons(port);
#if USE_PROXY
    //sin.sin_addr.s_addr = inet_addr(addr);
    inet_pton(AF_INET, addr, &sin.sin_addr);
#else
    sin.sin_addr = *addr;
#endif
    ret = connect(sockfd, (struct sockaddr*)&sin, sizeof(struct sockaddr_in));
    if (0 != ret)
    {
        printf("socket failed.
");
        closesocket(sockfd);
        sockfd = INVALID_SOCKET;
    }

    return sockfd;
}

void _close(SOCKET sockfd)
{
    if (INVALID_SOCKET != sockfd)
    {
        closesocket(sockfd);
    }
}

int Receive(SOCKET socket, char* buf, int bufLen)
{
    return recv(socket, buf, bufLen, 0);
}

bool Send(SOCKET socket, const char* buf, int len)
{
    long ilen = len;
    int sendCnt = 0;
    int ret;

    while (sendCnt < ilen)
    {
        if ((ret = send(socket, buf + sendCnt, ilen - sendCnt, 0)) == SOCKET_ERROR)
        {
            return false;
        }
        else
        {
            sendCnt += ret;
        }
    }
    return true;
}

void connect_proxy(SOCKET sockfd)
{
    // proxy user and password: dXNlcm5hbWU6cGFzc3dvcmQ= is "username:password" with base64 encode
    //const char* header = "CONNECT myip.ipip.net:80 HTTP/1.1
Authorization: Basic RDU1NjU1MDc6NTY4RkQyMzIwMTg1

Proxy-Authorization: Basic RDU1NjU1MDc6NTY4RkQyMzIwMTg1

";
    const unsigned char a[] = { "D5565507:568FD2320185" };
    string b = Encode(a, 21);
    char header[2048];
    sprintf_s(header, sizeof(header), "CONNECT myip.ipip.net:80 HTTP/1.1
Authorization: Basic %s

Proxy-Authorization: Basic %s

", b.c_str(), b.c_str());

    int offset = 0;
    char buf[2048] = { 0 }; 

    Send(sockfd, header, strlen(header));
    Receive(sockfd, buf, sizeof(buf));
    cout << buf << endl;
    if (strstr(buf, "HTTP/1.1 200 Connection established") != NULL)
    {
        printf("OK
");
        printf("%s",buf);
    }
}

void http_request()
{
    SOCKET sockfd = INVALID_SOCKET;
    struct hostent* host = NULL;
    const char* header = "GET / HTTP/1.1
Host: myip.ipip.net

"; //我们要请求的网址的域名
    char buf[2048] = { 0 };
#if USE_PROXY
    sockfd = _connect(PROXY_ADDR, PROXY_PORT);
    connect_proxy(sockfd);
#else
    host = gethostbyname("myip.ipip.net");
    sockfd = _connect((struct in_addr*)host->h_addr_list[0], 80);
#endif


    Send(sockfd, header, strlen(header));
    Receive(sockfd, buf, sizeof(buf));
    _close(sockfd);
    string info(buf);
    //编码转换 防止在控制台显示乱码
    char* pszBuffer = new char[info.length() + 1];
    wchar_t* pszWideBuffer = new wchar_t[(info.length() + 1) * 2];
    memset(pszWideBuffer, 0, (info.length() + 1) * 2);
    memset(pszBuffer, 0, info.length() + 1);
    MultiByteToWideChar(CP_UTF8, 0, info.c_str(), info.length(), pszWideBuffer, (info.length() + 1) * 2);//将unicode编码，转换为宽字节
    WideCharToMultiByte(CP_ACP, 0, pszWideBuffer, wcslen(pszWideBuffer), pszBuffer, info.length() + 1, NULL, NULL);//将宽字节,转换为控制台编码
    //cout << pszBuffer;
    info = pszBuffer;
    delete[] pszBuffer;
    delete[] pszWideBuffer;
    cout << info << endl;
}

int main()
{
    WSADATA wsaData; ///这个结构被用来存储 被WSAStartup函数调用后返回的 Windows Sockets数据
    WSAStartup(MAKEWORD(2, 2), &wsaData);//初始化网络编程能够使用的函数或方法等....初始化后,就可以创建套接字了  搜索对应的Socket库 这是使用2.2的版本
    http_request(); //请求数据 
    WSACleanup();//终止Winsock 2 DLL (Ws2_32.dll) 的使用
    return 0;
}