c++ 发邮件（含附件）

本程序在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","xxx@126.com",// 来源邮箱"xxx",   //密码"xxx.com" //目标邮箱);if (!mail.CReateSocket()){cout << "ReateSocket failed!" << endl;return -1;//}//标题默认是主机名，内容默认是ipmail.setTitle("test mail");mail.setContent("this is content.");//附件路径错误，不影响邮件正文的发送。mail.addfile("test.jpg"); //添加附件//mail.addfile("test2.png"); //添加附件mail.SendMail(); //类主函数system("pause");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25string _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 << "附件发送出错!" << 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ipsockClient = 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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c++ 发邮件（含附件）

本程序在vs2013测试通过，一共3个文件，发邮件的程序封装为Csmtp 类。

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