邮件正文及其附件的发送的C++实现

来源

这段代码我花了整整一天来编写，如果转载，请注明出处，谢谢！

   前面的一篇文章已经讲了如何发送邮件正文，原理我就不再叙述了，要了解的同学请到这里查看!

   http://blog.csdn.net/lishuhuakai/article/details/27503503

   网上很多发送邮件附件的代码都不能用，所以我用心写了一个，直接封装成了一个类，需要的同学可以直接调用这个类来发送邮件，使用的是纯C++,不含MFC，请放心使用。(在VS2013下测试完美通过!)

   废话不多说，直接上代码!

   Smtp.h

 #include <WinSock2.h>
 #include <iostream>
 #include <string>
 #include <list>
 using namespace std;

 #pragma  comment(lib, "ws2_32.lib") /*链接ws2_32.lib动态链接库*/
 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,
         string srvDomain,   //smtp服务器域名
         string userName,    //用户名
         string password,    //密码
         string targetEmail, //目的邮件地址
         string emailTitle,  //主题
         string content       //内容
         );
 public:
     ~CSmtp(void);
 public:
     int port;
 public:
     string domain;
     string user;
     string pass;
     string targetAddr;
     string title;
     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*/
     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(string &message);
     BOOL Recv();

     void FormatEmailHead(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(string &filePath); //添加附件
     void DeleteAttachment(string &filePath); //删除附件
     void DeleteAllAttachment(); //删除所有的附件
     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);
 };

      Smtp.cpp

 #include "stdafx.h"
 #include "Smtp.h"
 #include <iostream>
 #include <fstream>
 using namespace std;

 /*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 set
     if (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,
              string srvDomain,
              string userName,
              string password,
              string targetEmail,
              string emailTitle,
              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(string &message)
 {
     int err = send(sockClient, message.c_str(), message.length(), 0);
     if (err == SOCKET_ERROR)
     {
         return FALSE;
     }
     cout << message << endl;
     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';
     cout << buff << endl;
     return TRUE;
 }

 int CSmtp::Login()
 {
     string sendBuff;
     sendBuff = "EHLO ";
     sendBuff += user;
     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
 {
     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*/
     }


     sendBuff.empty();
     sendBuff = "RCPT TO: <" + targetAddr + ">\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(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*/
 {
     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 (list<FILEINFO *>::iterator pIter = listFile.begin(); pIter != listFile.end(); pIter++)
     {
         cout << "Attachment is sending ~~~~~" << endl;
         cout << "Please be patient!" << endl;
         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);
         ifstream ifs((*pIter)->filePath,ios::in | 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*/
 {
     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(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(string &filePath) //删除附件
 {
     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 (list<FILEINFO *>::iterator pIter = listFile.begin(); pIter != listFile.end(); )
     {
         FILEINFO *p = *pIter;
         pIter = listFile.erase(pIter);
         delete p;
     }
 }

 void CSmtp::SetSrvDomain(string &domain)
 {
     this->domain = domain;
 }

 void CSmtp::SetUserName(string &user)
 {
     this->user = user;
 }

 void CSmtp::SetPass(string &pass)
 {
     this->pass = pass;
 }
 void CSmtp::SetTargetEmail(string &targetAddr)
 {
     this->targetAddr = targetAddr;
 }
 void CSmtp::SetEmailTitle(string &title)
 {
     this->title = title;
 }
 void CSmtp::SetContent(string &content)
 {
     this->content = content;
 }
 void CSmtp::SetPort(int port)
 {
     this->port = port;
 }

   测试代码如下:

   main.cpp

 #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*/
         "[email protected]",    /*你的邮箱地址*/
         "19930714lyh",                  /*邮箱密码*/
         "[email protected]",    /*目的邮箱地址*/
         "好啊!",                          /*主题*/
         "李懿虎同学，你好！收到请回复！"       /*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;
 }

        在VS2005下面，很有可能会出现带中文的目录或者中文名文件打不开的情况，这个时候这么解决：在两个构造函数里面的第一句加上:setlocale(LC_ALL,"Chinese-simplified");这一句话即可解决！

     在VS2013里面貌似这个程序可以运行，微软这朵奇葩！不说了！

     请尽量不使用QQ邮箱登陆，因为我试过，貌似连不上。qq邮箱的服务器返回告诉你要求安全的连接，用SSL什么的，哎，qq也是朵奇葩！