C++实现邮件发送程序在vs2013测试通过，一共3个文件，发邮件的程序封装为Csmtp 类。
1.测试用的主函数
//
#include "Csmtp.h"
#pragma comment(lib, "Kernel32.lib")
int main()
{
Csmtp mail(
25,
"smtp.126.com",
"[email protected]",// 来源邮箱
"pwd",
"[email protected]" //目标邮箱
);
if (!mail.CReateSocket())
{
cout << "ReateSocket failed!" << endl;
return -1;//
}
mail.setTitle("test mail");
mail.setContent("this is content.");
mail.addfile("test1.png"); //添加附件
mail.addfile("test2.png"); //添加附件
mail.SendMail(); //类主函数
return 0;
} 2.Csmtp类定义
#include <iostream>
#include <string>
#include <vector>
#include <fstream>
#include <WinSock2.h> //适用平台 Windows
#pragma comment(lib, "ws2_32.lib") /*链接ws2_32.lib动态链接库*/
// POP3服务器（端口：110） Csmtp服务器（端口：25）
using namespace std;
class Csmtp
{
int port;
string domain;
string user;
string pass;
string target;
string title; //邮件标题
string content; //邮件内容
HOSTENT* pHostent;
SOCKET sockClient; //客户端的套接字
vector <string> filename; //存储附件名的向量
public:
Csmtp(
int _port, //端口25
string _domain, //域名
string _user, //发送者的邮箱
string _pass, //密码
string _target) //目标邮箱
:port(_port),domain(_domain),user(_user),pass(_pass), target(_target){};//内容
bool CReateSocket();
void setTitle(string tem){title = tem;}
void setContent(string tem){content = tem;}
int SendAttachment(SOCKET &sockClient);
int SendMail();
void addfile(string str){filename.push_back(str);}
}; 3. Csmtp 类的实现
#include "Csmtp.h"
//#include <afx.h>//异常类
static const char base64Char[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
char* 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;
}
int Csmtp::SendAttachment(SOCKET &sockClient) /*发送附件*/
{
for (std::vector<string>::iterator iter = filename.begin();iter != filename.end(); iter++)
{
cout << "Attachment is sending··· " << endl;
string path=*iter;
ifstream ifs(path, ios::in | ios::binary); //'或链接2个属性，以输入、二进制打开'
if (false == ifs.is_open())
{
cout<<"无法打开文件！"<<endl;
return 1;
}
string sendstring;
sendstring = "--@boundary@\r\nContent-Type: application/octet-stream; name=\"1.jpg\"\r\n";
sendstring += "Content-Disposition: attachment; filename=\"1.jpg\"\r\n";
sendstring += "Content-Transfer-Encoding: base64\r\n\r\n";
send(sockClient, sendstring.c_str(), sendstring.length(), 0);
//infile.read((char*)buffer,sizeof(数据类型));
// get length of file:
ifs.seekg (0, ifs.end);
int length = ifs.tellg();
ifs.seekg (0, ifs.beg);
cout<<"length:"<<length<<endl;
// allocate memory:
char * buffer = new char [length];
// read data as a block:
ifs.read (buffer,length);
ifs.close();
char *pbase;
pbase = base64Encode(buffer, length);
delete[]buffer;
string str(pbase);
delete[]pbase;
str+="\r\n";
int err =send(sockClient, str.c_str(), strlen(str.c_str()), 0);
if (err != strlen(str.c_str()))
{
cout << "文件传送出错!" << endl;
return 1;
}
}
return 0;
}
bool Csmtp::CReateSocket()
{
WSADATA wsaData;
WORD wVersionRequested = MAKEWORD(2, 1);
//WSAStarup，即WSA(Windows SocKNDs Asynchronous，Windows套接字异步)的启动命令
int err = WSAStartup(wVersionRequested, &wsaData);
cout<<"WSAStartup(0:successful):"<<err<<endl;
char namebuf[128]; //获得本地计算机名
string ip_list;
if(0==gethostname(namebuf,128))
{
struct hostent* pHost; //获得本地IP地址
pHost=gethostbyname(namebuf); //pHost返回的是指向主机的列表
for (int i=0;pHost!=NULL&&pHost->h_addr_list[i]!=NULL;i++)
{
string tem = inet_ntoa(*(struct in_addr *)pHost->h_addr_list[i]);
ip_list += tem;
ip_list += "\n";
}
}
else
{
cout<<"获取主机信息失败..."<<endl ;
}
//////////////////////////////////////////////////////////////////////////
title=namebuf;// 邮件标题
content=ip_list; //主机ip
sockClient = socket(AF_INET, SOCK_STREAM, 0); //建立socket对象
pHostent = gethostbyname(domain.c_str()); //得到有关于域名的信息
if (pHostent == NULL)
{
printf( "创建连接失败，也许没联网！\n" );
return false;
}
return true;
}
int Csmtp::SendMail()
{
char *ecode;
char buff[500]; //recv函数返回的结果
int err = 0;
string message; //
SOCKADDR_IN addrServer; //服务端地址
addrServer.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
addrServer.sin_family = AF_INET;
addrServer.sin_port = htons(port); //连接端口25
//int connect (SOCKET s , const struct sockaddr FAR *name , int namelen );
err = connect(sockClient, (SOCKADDR*)&addrServer, sizeof(SOCKADDR)); //向服务器发送请求
cout<<"connect:"<<err<<endl;
//telnet smtp.126.com 25 连接服务器结束
buff[recv(sockClient, buff, 500, 0)]='\0';
//cout<<"connect:"<<buff<<endl;
message="ehlo 126.com\r\n";
send(sockClient, message.c_str(), message.length(), 0);
buff[recv(sockClient, buff, 500, 0)]='\0';
//cout<<"helo:"<<buff<<endl;
message="auth login \r\n";
send(sockClient, message.c_str(), message.length(), 0);
buff[recv(sockClient, buff, 500, 0)]='\0';
//cout<<"auth login:"<<buff<<endl;
//上传邮箱名
message=user;
ecode = base64Encode(message.c_str(), strlen(message.c_str()));
message = ecode;
message += "\r\n";
delete[]ecode;
send(sockClient, message.c_str(), message.length(), 0);
buff[recv(sockClient, buff, 500, 0)]='\0';
//cout<<"usrname:"<<buff<<endl;
//上传邮箱密码
message=pass;
ecode = base64Encode(message.c_str(), strlen(message.c_str()));
message = ecode;
delete[]ecode;
message += "\r\n";
send(sockClient, message.c_str(), message.length(), 0);
buff[recv(sockClient, buff, 500, 0)]='\0';
//cout<<"password:"<<buff<<endl;
message="mail from:<"+user+">\r\nrcpt to:<"+target+">\r\n";
send(sockClient, message.c_str(), message.length(), 0);
buff[recv(sockClient, buff, 500, 0)]='\0';
//cout<<"mail from: "<<buff<<endl;
buff[recv(sockClient, buff, 500, 0)]='\0';
//cout<<"rcpt to: "<<buff<<endl;
message="data\r\n";//data要单独发送一次
send(sockClient, message.c_str(), message.length(), 0);
buff[recv(sockClient, buff, 500, 0)]='\0';
//cout<<"data: "<<buff<<endl;
///-----------------------------------------DATA-------------------------------------
//要使用Csmtp 发送附件, 需要对Csmtp 头信息进行说明, 改变Content-type 及为每一段正文添加BOUNDARY 名,
cout<<"-------------------DATA------------------------"<<endl;
// 头
message="from:"+user+"\r\nto:"+target+"\r\nsubject:"+title+"\r\n";
message += "MIME-Version: 1.0\r\n";
message += "Content-Type: multipart/mixed;boundary=@boundary@\r\n\r\n";
send(sockClient, message.c_str(), message.length(), 0);
// 正文
message = "--@boundary@\r\nContent-Type: text/plain;charset=\"gb2312\"\r\n\r\n"+content+"\r\n\r\n";
send(sockClient, message.c_str(), message.length(), 0);
//------------------------------------------------------------------------------------------------
// 发送附件
SendAttachment(sockClient);
/*发送结尾信息*/
message = "--@boundary@--\r\n.\r\n";
send(sockClient, message.c_str(), message.length(), 0);
buff[recv(sockClient, buff, 500, 0)]='\0';
//cout<<"end_qwertyuiop:"<<buff<<endl;
message="QUIT\r\n";
send(sockClient, message.c_str(), message.length(), 0);
buff[recv(sockClient, buff, 500, 0)]='\0';
cout<<"Send mail is finish:"<<buff<<endl;
return 0;
}容易理解的简化版可以点击->这里
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