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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，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;
char *fileData;
public:
char buff[MAXLEN + 1];
int buffLen;
SOCKET sockClient; //客户端的套接字
public:
SOCKET CreateConn(); /*创建连接*/
BOOL Send(string &message);
BOOL Recv();
int GetStrLen(char* pString); //得到字符串的长度
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
BOOL SendAttachment_Ex();
BOOL SendEnd();
int SendEmail();
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();
char* base64Encode(char const* origSigned, unsigned origLength);
};Smtp.cpp#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 = 0;
this->user = "";
this->pass = "";
this->targetAddr = "";
this->title = "";
this->domain = "";
this->sockClient = 0;
}
CSmtp::~CSmtp(void)
{
delete []fileData;
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 = CreateConn(); //创建连接
}
SOCKET 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 0;
//printf("链接失败\n");
}
return sockClient;
}
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()
{
Recv();
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);
}
BOOL 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 += "base64.cpp\"";
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);
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 FALSE;
}
delete []chSendBuff;
}
return TRUE;
}
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()
{
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*/
}
if (FALSE == SendAttachment_Ex())
{
return 1; /*错误码1是由于网络的错误*/
}
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)
{
listFile.remove(*pIter);
delete *pIter;
break;
}
}
}
void CSmtp::DeleteAllAttachment() /*删除所有的文件*/
{
for (list<FILEINFO *>::iterator pIter = listFile.begin(); pIter != listFile.end(); pIter++)
{
listFile.remove(*pIter);
delete *pIter;
}
}
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*/
"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("C:\\Users\\李懿虎\\Desktop\\App\\SAkura\\模版.png");
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);
smtp.SendEmail_Ex();
system("pause");
return 0;
}
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