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



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#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

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#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

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#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*/

"it_is_just_a_test@163.com", /*你的邮箱地址*/

"19930714lyh", /*邮箱密码*/

"it_is_just_a_test@126.com", /*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！