SMTP VS C++实现向多人发送邮件，可带多个附件

#ifndef __SMTP_H__ //避免重复包含
#define __SMTP_H__#include <list>
#include <WinSock2.h>
#include <iostream>
#include <fstream>
#include <string>
#include <sstream>const int MAXLEN = 1024;
const int MAX_FILE_LEN = 6000;static const char base64Char[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";struct FILEINFO /*用来记录文件的一些信息*/
{char fileName[128]; /*文件名称*/char filePath[256]; /*文件绝对路径*/
};class CSmtp
{
public:CSmtp(void);CSmtp(int port,std::string srvDomain,  //smtp服务器域名std::string userName,   //用户名std::string password,   //密码std::string targetEmail, //目的邮件地址std::string emailTitle,  //主题std::string content       //内容);
public:~CSmtp(void);
public:int port;
public:std::string domain;std::string user;std::string pass;std::string targetAddr;std::string title;std::string content;/*为了方便添加文件，删除文件神马的，使用list容器最为方便，相信大家在数据结构里面都学过*/std::list <FILEINFO *> listFile;public:char buff[MAXLEN + 1];int buffLen;SOCKET sockClient;  //客户端的套接字
public:bool CreateConn(); /*创建连接*/bool Send(std::string &message);bool Recv();void FormatEmailHead(std::string &email);//格式化要发送的邮件头部int Login();bool SendEmailHead();       //发送邮件头部信息bool SendTextBody();        //发送文本信息//bool SendAttachment();        //发送附件int SendAttachment_Ex();bool SendEnd();
public:void AddAttachment(std::string &filePath); //添加附件void DeleteAttachment(std::string &filePath); //删除附件void DeleteAllAttachment(); //删除所有的附件void SetSrvDomain(std::string &domain);void SetUserName(std::string &user);void SetPass(std::string &pass);void SetTargetEmail(std::string &targetAddr);void SetEmailTitle(std::string &title);void SetContent(std::string &content);void SetPort(int port);int SendEmail_Ex();/*关于错误码的说明:1.网络错误导致的错误2.用户名错误3.密码错误4.文件不存在0.成功*/char* base64Encode(char const* origSigned, unsigned origLength);
};#endif // !__SMTP_H__

smtp.cpp
#include "StdAfx.h" #include "smtp.h"  #pragma comment(lib, "ws2_32.lib") /*链接ws2_32.lib动态链接库*/  /*base64采用别人的编码,不过，这不是重点，重点是我完成了我的一个比较好的邮件发送客户端*/ char* CSmtp::base64Encode(char const* origSigned, unsigned origLength) {
     unsigned char const* orig = (unsigned char const*)origSigned; // in case any input bytes have the MSB setif (orig == NULL) return NULL; unsigned const numOrig24BitValues = origLength / 3;bool havePadding = origLength > numOrig24BitValues * 3;bool havePadding2 = origLength == numOrig24BitValues * 3 + 2;unsigned const numResultBytes = 4 * (numOrig24BitValues + havePadding);char* result = new char[numResultBytes + 3]; // allow for trailing '/0' // Map each full group of 3 input bytes into 4 output base-64 characters:unsigned i;for (i = 0; i < numOrig24BitValues; ++i){
     result[4 * i + 0] = base64Char[(orig[3 * i] >> 2) & 0x3F];result[4 * i + 1] = base64Char[(((orig[3 * i] & 0x3) << 4) | (orig[3 * i + 1] >> 4)) & 0x3F];result[4 * i + 2] = base64Char[((orig[3 * i + 1] << 2) | (orig[3 * i + 2] >> 6)) & 0x3F];result[4 * i + 3] = base64Char[orig[3 * i + 2] & 0x3F];} // Now, take padding into account. (Note: i == numOrig24BitValues)if (havePadding){
     result[4 * i + 0] = base64Char[(orig[3 * i] >> 2) & 0x3F];if (havePadding2){
     result[4 * i + 1] = base64Char[(((orig[3 * i] & 0x3) << 4) | (orig[3 * i + 1] >> 4)) & 0x3F];result[4 * i + 2] = base64Char[(orig[3 * i + 1] << 2) & 0x3F];}else{
     result[4 * i + 1] = base64Char[((orig[3 * i] & 0x3) << 4) & 0x3F];result[4 * i + 2] = '=';}result[4 * i + 3] = '=';} result[numResultBytes] = '\0';return result; } CSmtp::CSmtp(void) {
     this->content = "";this->port = 25;this->user = "";this->pass = "";this->targetAddr = "";this->title = "";this->domain = ""; WORD wVersionRequested;WSADATA wsaData;int err;wVersionRequested = MAKEWORD(2, 1);err = WSAStartup(wVersionRequested, &wsaData);this->sockClient = 0;  }  CSmtp::~CSmtp(void) {
     DeleteAllAttachment();closesocket(sockClient);WSACleanup(); }   CSmtp::CSmtp(int port,std::string srvDomain,std::string userName,std::string password,std::string targetEmail,std::string emailTitle,std::string content) {
     this->content = content;this->port = port;this->user = userName;this->pass = password;this->targetAddr = targetEmail;this->title = emailTitle;this->domain = srvDomain; WORD wVersionRequested;WSADATA wsaData;int err;wVersionRequested = MAKEWORD(2, 1);err = WSAStartup(wVersionRequested, &wsaData);this->sockClient = 0; }  bool CSmtp::CreateConn() {
     //为建立socket对象做准备，初始化环境SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0); //建立socket对象SOCKADDR_IN addrSrv;HOSTENT* pHostent;pHostent = gethostbyname(domain.c_str()); //得到有关于域名的信息 addrSrv.sin_addr.S_un.S_addr = *((DWORD *)pHostent->h_addr_list[0]); //得到smtp服务器的网络字节序的ip地址 addrSrv.sin_family = AF_INET;addrSrv.sin_port = htons(port);int err = connect(sockClient, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR)); //向服务器发送请求 if (err != 0){
     return false;//printf("链接失败\n");}this->sockClient = sockClient;if (false == Recv()){
     return false;}return true; }  bool CSmtp::Send(std::string &message) {
     int err = send(sockClient, message.c_str(), message.length(), 0);if (err == SOCKET_ERROR){
     return false;}std::string message01;return true; }  bool CSmtp::Recv() {
     memset(buff, 0, sizeof(char)* (MAXLEN + 1));int err = recv(sockClient, buff, MAXLEN, 0); //接收数据if (err == SOCKET_ERROR){
     return false;}buff[err] = '\0';return true; }  int CSmtp::Login() {
     std::string sendBuff;sendBuff = "EHLO ";sendBuff += user; // 这一部分需要通过telnet验证一下sendBuff += "\r\n"; if (false == Send(sendBuff) || false == Recv()) //既接收也发送{
     return 1; /*1表示发送失败由于网络错误*/} sendBuff.empty();sendBuff = "AUTH LOGIN\r\n";if (false == Send(sendBuff) || false == Recv()) //请求登陆{
     return 1; /*1表示发送失败由于网络错误*/} sendBuff.empty();int pos = user.find('@', 0);sendBuff = user.substr(0, pos); //得到用户名 char *ecode;/*在这里顺带扯一句，关于string类的length函数与C语言中的strlen函数的区别,strlen计算出来的长度，只到'\0'字符为止,而string::length()函数实际上返回的是string类中字符数组的大小,你自己可以测试一下，这也是为什么我下面不使用string::length()的原因*/ ecode = base64Encode(sendBuff.c_str(), strlen(sendBuff.c_str()));sendBuff.empty();sendBuff = ecode;sendBuff += "\r\n";delete[]ecode; if (false == Send(sendBuff) || false == Recv()) //发送用户名，并接收服务器的返回{
     return 1; /*错误码1表示发送失败由于网络错误*/} sendBuff.empty();ecode = base64Encode(pass.c_str(), strlen(pass.c_str()));sendBuff = ecode;sendBuff += "\r\n";delete[]ecode; if (false == Send(sendBuff) || false == Recv()) //发送用户密码，并接收服务器的返回{
     return 1; /*错误码1表示发送失败由于网络错误*/} if (NULL != strstr(buff, "550")){
     return 2;/*错误码2表示用户名错误*/} if (NULL != strstr(buff, "535")) /*535是认证失败的返回*/{
     return 3; /*错误码3表示密码错误*/}return 0; }  bool CSmtp::SendEmailHead() //发送邮件头部信息 {
     std::string sendBuff;sendBuff = "MAIL FROM: <" + user + ">\r\n";if (false == Send(sendBuff) || false == Recv()){
     return false; /*表示发送失败由于网络错误*/} std::istringstream is(targetAddr);std::string tmpadd;while(is>>tmpadd){
     sendBuff.empty();sendBuff = "RCPT TO: <" + tmpadd + ">\r\n";if (false == Send(sendBuff) || false == Recv()){
     return false; /*表示发送失败由于网络错误*/}} sendBuff.empty();sendBuff = "DATA\r\n";if (false == Send(sendBuff) || false == Recv()){
     return false; //表示发送失败由于网络错误} sendBuff.empty();FormatEmailHead(sendBuff);if (false == Send(sendBuff))//发送完头部之后不必调用接收函数,因为你没有\r\n.\r\n结尾，服务器认为你没有发完数据，所以不会返回什么值{
     return false; /*表示发送失败由于网络错误*/}return true; }  void CSmtp::FormatEmailHead(std::string &email) {
     /*格式化要发送的内容*/email = "From: ";email += user;email += "\r\n"; email += "To: ";email += targetAddr;email += "\r\n"; email += "Subject: ";email += title;email += "\r\n"; email += "MIME-Version: 1.0";email += "\r\n"; email += "Content-Type: multipart/mixed;boundary=qwertyuiop";email += "\r\n";email += "\r\n"; }  bool CSmtp::SendTextBody() /*发送邮件文本*/ {
     std::string sendBuff;sendBuff = "--qwertyuiop\r\n";sendBuff += "Content-Type: text/plain;";sendBuff += "charset=\"gb2312\"\r\n\r\n";sendBuff += content;sendBuff += "\r\n\r\n";return Send(sendBuff); }  int CSmtp::SendAttachment_Ex() /*发送附件*/ {
     for (std::list<FILEINFO *>::iterator pIter = listFile.begin(); pIter != listFile.end(); pIter++){
     //cout << "Attachment is sending ~~~~~" << endl;//cout << "Please be patient!" << endl;std::string sendBuff;sendBuff = "--qwertyuiop\r\n";sendBuff += "Content-Type: application/octet-stream;\r\n";sendBuff += " name=\"";sendBuff += (*pIter)->fileName;sendBuff += "\"";sendBuff += "\r\n"; sendBuff += "Content-Transfer-Encoding: base64\r\n";sendBuff += "Content-Disposition: attachment;\r\n";sendBuff += " filename=\"";sendBuff += (*pIter)->fileName;sendBuff += "\""; sendBuff += "\r\n";sendBuff += "\r\n";Send(sendBuff);std::ifstream ifs((*pIter)->filePath, std::ios::in | std::ios::binary);if (false == ifs.is_open()){
     return 4; /*错误码4表示文件打开错误*/}char fileBuff[MAX_FILE_LEN];char *chSendBuff;memset(fileBuff, 0, sizeof(fileBuff));/*文件使用base64加密传送*/while (ifs.read(fileBuff, MAX_FILE_LEN)){
     //cout << ifs.gcount() << endl;chSendBuff = base64Encode(fileBuff, MAX_FILE_LEN);chSendBuff[strlen(chSendBuff)] = '\r';chSendBuff[strlen(chSendBuff)] = '\n';send(sockClient, chSendBuff, strlen(chSendBuff), 0);delete[]chSendBuff;}//cout << ifs.gcount() << endl;chSendBuff = base64Encode(fileBuff, ifs.gcount());chSendBuff[strlen(chSendBuff)] = '\r';chSendBuff[strlen(chSendBuff)] = '\n';int err = send(sockClient, chSendBuff, strlen(chSendBuff), 0); if (err != strlen(chSendBuff)){
     //cout << "文件传送出错!" << endl;return 1;}delete[]chSendBuff;}return 0; }  bool CSmtp::SendEnd() /*发送结尾信息*/ {
     std::string sendBuff;sendBuff = "--qwertyuiop--";sendBuff += "\r\n.\r\n";if (false == Send(sendBuff) || false == Recv()){
     return false;}//cout << buff << endl;sendBuff.empty();sendBuff = "QUIT\r\n";return (Send(sendBuff) && Recv()); }  int CSmtp::SendEmail_Ex() {
     if (false == CreateConn()){
     return 1;}//Recv();int err = Login(); //先登录if (err != 0){
     return err; //错误代码必须要返回}if (false == SendEmailHead()) //发送EMAIL头部信息{
     return 1; /*错误码1是由于网络的错误*/}if (false == SendTextBody()){
     return 1; /*错误码1是由于网络的错误*/}err = SendAttachment_Ex();if (err != 0){
     return err;}if (false == SendEnd()){
     return 1; /*错误码1是由于网络的错误*/}return 0; /*0表示没有出错*/ }  void CSmtp::AddAttachment(std::string &filePath) //添加附件 {
     FILEINFO *pFile = new FILEINFO;strcpy_s(pFile->filePath, filePath.c_str());const char *p = filePath.c_str();strcpy_s(pFile->fileName, p + filePath.find_last_of("\\") + 1);listFile.push_back(pFile); }  void CSmtp::DeleteAttachment(std::string &filePath) //删除附件 {
     std::list<FILEINFO *>::iterator pIter;for (pIter = listFile.begin(); pIter != listFile.end(); pIter++){
     if (strcmp((*pIter)->filePath, filePath.c_str()) == 0){
     FILEINFO *p = *pIter;listFile.remove(*pIter);delete p;break;}} }  void CSmtp::DeleteAllAttachment() /*删除所有的文件*/ {
     for (std::list<FILEINFO *>::iterator pIter = listFile.begin(); pIter != listFile.end();){
     FILEINFO *p = *pIter;pIter = listFile.erase(pIter);delete p;} }  void CSmtp::SetSrvDomain(std::string &domain) {
     this->domain = domain; }  void CSmtp::SetUserName(std::string &user) {
     this->user = user; }  void CSmtp::SetPass(std::string &pass) {
     this->pass = pass; } void CSmtp::SetTargetEmail(std::string &targetAddr) {
     this->targetAddr = targetAddr; } void CSmtp::SetEmailTitle(std::string &title) {
     this->title = title; } void CSmtp::SetContent(std::string &content) {
     this->content = content; } void CSmtp::SetPort(int port) {
     this->port = port; }

测试程序
#include "Smtp.h"
#include <iostream>
using namespace std;

int main()
{
    
CSmtp smtp(25,                             /*smtp端口*/"smtp.163.com",                 /*smtp服务器地址*/"yourname@163.com",         /*你的邮箱地址*/"yourpasswd",                   /*邮箱密码*/"target1@163.com target2@163.com",  /*目的邮箱地址,这一部分用空格分割可添加多个收信人*/"消息",                           /*主题*/"消息提示"      /*邮件正文*/);/**//添加附件时注意,\一定要写成\\，因为转义字符的缘故string filePath("D:\\课程设计报告.doc");smtp.AddAttachment(filePath);*/
/*还可以调用CSmtp::DeleteAttachment函数删除附件，还有一些函数，自己看头文件吧!*///filePath = "C:\\Users\\李懿虎\\Desktop\\sendEmail.cpp";//smtp.AddAttachment(filePath);
int err;if ((err = smtp.SendEmail_Ex()) != 0){
    if (err == 1)cout << "错误1: 由于网络不畅通，发送失败!" << endl;if (err == 2)cout << "错误2: 用户名错误,请核对!" << endl;if (err == 3)cout << "错误3: 用户密码错误，请核对!" << endl;if (err == 4)cout << "错误4: 请检查附件目录是否正确，以及文件是否存在!" << endl;}system("pause");return 0;
}


  

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