邮件正文及其附件的发送的C++实现

       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,纯c++代码。(在VS2013下测试完美通过!)

   废话不多说，直接上代码!

   Smtp.h

#ifndef __SMTP_H__ //避免重复包含#define __SMTP_H__#include <iostream>#include <list>#include <WinSock2.h>using namespace std;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void SetSrvDomain(string &domain);void SetUserName(string &user);void SetPass(string &pass);void SetTargetEmail(string &targetAddr);void SetEmailTitle(string &title);void SetContent(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 "Smtp.h"#include <iostream>#include <fstream>using namespace std;#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,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;}string message01;cout << message.c_str() << 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*/"[e-mail]",/*你的邮箱地址*/"XXXXXXX",/*邮箱密码*/"[e-mail]",/*目的邮箱地址*/"好啊!",/*主题*/"XXX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！

     附上我的一个工程：https://github.com/lishuhuakai/Mail