POP邮件收取邮件 代码

// 111111.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <WinSock.h>
#include <iostream>
#include <string>
#pragma comment(lib,"WSock32.Lib")  

class ZBase64
{
public:
	std::string Encode(const unsigned char* Data, int DataByte);
	std::string Decode(const char* Data, int DataByte, int& OutByte);
};

std::string ZBase64::Encode(const unsigned char* Data, int DataByte)
{
	//编码表
	const char EncodeTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	//返回值
	std::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 += "\r\n"; 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;
}

std::string ZBase64::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
	std::string strDecode;
	int nValue;
	int i = 0;
	while (i < DataByte)
	{
		if (*Data != '\r' && *Data != '\n')
		{
			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;
}
//===============================
class SocketInit {
public:
	SocketInit() {
		WSADATA wsaData;
		int err;
		err = WSAStartup(MAKEWORD(2,2), &wsaData);
		if (err) {
			std::cerr << "socket init error " << err << std::endl;
			exit(err);
		}
	}
	~SocketInit() {
		WSACleanup();
	}
};

SocketInit gSockInit;
const int BUF_MAX_LEN = 1024*10;

const char* strUser = ""; //邮箱用户名
const char* strPassWord = ""; //邮箱密码

int main()
{
	// base64 解码示例
	std::string mailStr(R"(PGRpdiBzdHlsZT0ibGluZS1oZWlnaHQ6MS43O2NvbG9yOiMwMDAwMDA7Zm9udC1zaXplOjE0cHg7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)");
	ZBase64 t;
	int i;
	std::string sOut = t.Decode(mailStr.c_str(), mailStr.size(), i);
	std::cout << sOut << std::endl;
	//==========================================
	SOCKET mySock = socket(AF_INET, SOCK_STREAM, 0);//创建了可识别套接字

	struct hostent *remoteHost;
	struct in_addr addr;

	if ((remoteHost = gethostbyname("pop.126.com")) == NULL)
		exit(1);

	if (remoteHost->h_addrtype == AF_INET)
	{
		addr.s_addr = *(u_long *)remoteHost->h_addr_list[0];
		printf("IP Address #%d: %s\n", 0, inet_ntoa(addr));
	}

	SOCKADDR_IN popServer;
	popServer.sin_addr = addr;
	popServer.sin_family = AF_INET;
	popServer.sin_port = htons(110);
	// step 1 connect
	int ret = connect(mySock, (SOCKADDR*)&popServer, sizeof(SOCKADDR));
	if (ret)
		exit(ret);

	char receiveBuf[BUF_MAX_LEN] = {0};
	ret = recv(mySock, receiveBuf, BUF_MAX_LEN,0);
	if (SOCKET_ERROR == ret)
		exit(ret);
	std::cout << receiveBuf ;

	// step 2 sendUser
	std::string SendMessage("USER ");
	SendMessage += strUser;
	SendMessage += "\r\n";

	ret = send(mySock, SendMessage.c_str(), SendMessage.size(),0);
	if (SOCKET_ERROR == ret)
		exit(ret);
	ret = recv(mySock, receiveBuf, BUF_MAX_LEN, 0);
	if (SOCKET_ERROR == ret)
		exit(ret);
	std::cout << receiveBuf;

	//stecp 3 sendPass
	SendMessage.clear();
	SendMessage +="PASS ";
	SendMessage += strPassWord;
	SendMessage += "\r\n";
	ret = send(mySock, SendMessage.c_str(), SendMessage.size(), 0);
	if (SOCKET_ERROR == ret)
		exit(ret);
	ret = recv(mySock, receiveBuf, BUF_MAX_LEN, 0);
	if (SOCKET_ERROR == ret)
		exit(ret);
	std::cout << receiveBuf;

	//stecp 4  test LIST
	SendMessage.clear();
	SendMessage += "LIST\r\n";
	ret = send(mySock, SendMessage.c_str(), SendMessage.size(), 0);
	if (SOCKET_ERROR == ret)
		exit(ret);
	ret = recv(mySock, receiveBuf, BUF_MAX_LEN, 0);
	if (SOCKET_ERROR == ret)
		exit(ret);
	//std::cout << receiveBuf;

	std::cout << std::endl << std::endl << std::endl
		<< std::endl << std::endl << std::endl
		<< std::endl << std::endl << std::endl;

	/*
	//stecp 5 test DELE
	SendMessage.clear();
	SendMessage += "DELE 2\r\n";
	ret = send(mySock, SendMessage.c_str(), SendMessage.size(), 0);
	if (SOCKET_ERROR == ret)
		exit(ret);
	//ret = recv(mySock, receiveBuf, BUF_MAX_LEN, 0);
	if (SOCKET_ERROR == ret)
		exit(ret);
	std::cout << receiveBuf;
	//ret = recv(mySock, receiveBuf, BUF_MAX_LEN, 0);
	//if (SOCKET_ERROR == ret)
		//exit(ret);
	//std::cout << receiveBuf;
	*/

	//stecp 6 test RETR
	SendMessage.clear();
	SendMessage += "RETR 1\r\n";
	ret = send(mySock, SendMessage.c_str(), SendMessage.size(), 0);
	if (SOCKET_ERROR == ret)
		exit(ret);
	ret = recv(mySock, receiveBuf, BUF_MAX_LEN, 0);
	if (SOCKET_ERROR == ret)
		exit(ret);
	std::cout << receiveBuf;

	std::cout << std::endl;

	ret = recv(mySock, receiveBuf, BUF_MAX_LEN, 0);
	if (SOCKET_ERROR == ret)
		exit(ret);
	std::cout << receiveBuf;

	std::cout << std::endl;

	closesocket(mySock);
    return 0;
}

　　参考此博客

http://yerik.blog.51cto.com/1662422/743998