C++发送邮件实现代码

// SendMail.h#ifndef _SEND_MAIL_H_#define _SEND_MAIL_H_#include <windows.h>#include <stdio.h>#include <WinSock.h>#include <iostream>using namespace std;// 协议中加密部分使用的是base64方法char ConvertToBase64(char c6);void EncodeBase64(char *dbuf, char *buf128, int len);void SendMail(char *email, const char *body);int OpenSocket(struct sockaddr *addr);#endif

// SendMail.cpp#include "SendMail.h"#pragma comment(lib, "ws2_32.lib")struct Base64Date6{  unsigned int d4 : 6;  unsigned int d3 : 6;  unsigned int d2 : 6;  unsigned int d1 : 6;};char ConvertToBase64(char uc){  if (uc < 26)  {    return 'A' + uc;  }  if (uc < 52)  {    return 'a' + (uc - 26);  }  if (uc < 62)  {    return '0' + (uc - 52);  }  if (uc == 62)  {    return '+';  }  return '/';}// base64的实现void EncodeBase64(char *dbuf, char *buf128, int len){  struct Base64Date6 *ddd = NULL;  int      i = 0;  char     buf[256] = { 0 };  char     *tmp = NULL;  char     cc = '/0';  memset(buf, 0, 256);  strcpy_s(buf, 256, buf128);  for (i = 1; i <= len / 3; i++)  {    tmp = buf + (i - 1) * 3;    cc = tmp[2];    tmp[2] = tmp[0];    tmp[0] = cc;    ddd = (struct Base64Date6 *)tmp;    dbuf[(i - 1) * 4 + 0] = ConvertToBase64((unsigned int)ddd->d1);    dbuf[(i - 1) * 4 + 1] = ConvertToBase64((unsigned int)ddd->d2);    dbuf[(i - 1) * 4 + 2] = ConvertToBase64((unsigned int)ddd->d3);    dbuf[(i - 1) * 4 + 3] = ConvertToBase64((unsigned int)ddd->d4);  }  if (len % 3 == 1)  {    tmp = buf + (i - 1) * 3;    cc = tmp[2];    tmp[2] = tmp[0];    tmp[0] = cc;    ddd = (struct Base64Date6 *)tmp;    dbuf[(i - 1) * 4 + 0] = ConvertToBase64((unsigned int)ddd->d1);    dbuf[(i - 1) * 4 + 1] = ConvertToBase64((unsigned int)ddd->d2);    dbuf[(i - 1) * 4 + 2] = '=';    dbuf[(i - 1) * 4 + 3] = '=';  }  if (len % 3 == 2)  {    tmp = buf + (i - 1) * 3;    cc = tmp[2];    tmp[2] = tmp[0];    tmp[0] = cc;    ddd = (struct Base64Date6 *)tmp;    dbuf[(i - 1) * 4 + 0] = ConvertToBase64((unsigned int)ddd->d1);    dbuf[(i - 1) * 4 + 1] = ConvertToBase64((unsigned int)ddd->d2);    dbuf[(i - 1) * 4 + 2] = ConvertToBase64((unsigned int)ddd->d3);    dbuf[(i - 1) * 4 + 3] = '=';  }  return;}// 发送邮件void SendMail(char *email, const char *body){  int   sockfd = { 0 };  char  buf[1500] = { 0 };  char  rbuf[1500] = { 0 };  char  login[128] = { 0 };  char  pass[128] = { 0 };  WSADATA WSAData;  struct sockaddr_in their_addr = { 0 };  WSAStartup(MAKEWORD(2, 2), &WSAData);  memset(&their_addr, 0, sizeof(their_addr));  their_addr.sin_family = AF_INET;  their_addr.sin_port = htons(25);  // 一般是25端口不需要改  hostent* hptr = gethostbyname("smtp.126.com");     // 端口和服务器  memcpy(&their_addr.sin_addr.S_un.S_addr, hptr->h_addr_list[0], hptr->h_length);  printf("IP of smpt.163.com is : %d:%d:%d:%d/n",    their_addr.sin_addr.S_un.S_un_b.s_b1,    their_addr.sin_addr.S_un.S_un_b.s_b2,    their_addr.sin_addr.S_un.S_un_b.s_b3,    their_addr.sin_addr.S_un.S_un_b.s_b4);  // 连接邮件服务器，如果连接后没有响应，则2 秒后重新连接  sockfd = OpenSocket((struct sockaddr *)&their_addr);  memset(rbuf, 0, 1500);  while (recv(sockfd, rbuf, 1500, 0) == 0)  {    cout << "reconnect..." << endl;    Sleep(2);    sockfd = OpenSocket((struct sockaddr *)&their_addr);    memset(rbuf, 0, 1500);  }  cout << rbuf << endl;  // EHLO  memset(buf, 0, 1500);  sprintf_s(buf, 1500, "EHLO HYL-PC/r/n");  send(sockfd, buf, strlen(buf), 0);  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout << "EHLO REceive: " << rbuf << endl;  // AUTH LOGIN  memset(buf, 0, 1500);  sprintf_s(buf, 1500, "AUTH LOGIN/r/n");  send(sockfd, buf, strlen(buf), 0);  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout << "Auth Login Receive: " << rbuf << endl;  // USER  memset(buf, 0, 1500);  sprintf_s(buf, 1500, "xxxxxx@126.com");//你的邮箱账号  memset(login, 0, 128);  EncodeBase64(login, buf, strlen(buf));  sprintf_s(buf, 1500, "%s/r/n", login);  send(sockfd, buf, strlen(buf), 0);  cout << "Base64 UserName: " << buf << endl;  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout << "User Login Receive: " << rbuf << endl;  // PASSWORD  sprintf_s(buf, 1500, "********");//你的邮箱密码  memset(pass, 0, 128);  EncodeBase64(pass, buf, strlen(buf));  sprintf_s(buf, 1500, "%s/r/n", pass);  send(sockfd, buf, strlen(buf), 0);  cout << "Base64 Password: " << buf << endl;  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout << "Send Password Receive: " << rbuf << endl;  // MAIL FROM  memset(buf, 0, 1500);  sprintf_s(buf, 1500, "MAIL FROM: <xxxx@126.com>/r/n"); //此处要和发邮件的邮箱保持一致  send(sockfd, buf, strlen(buf), 0);  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout << "set Mail From Receive: " << rbuf << endl;  // RCPT TO 第一个收件人  sprintf_s(buf, 1500, "RCPT TO:<%s>/r/n", email);  send(sockfd, buf, strlen(buf), 0);  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout << "Tell Sendto Receive: " << rbuf << endl;  // DATA 准备开始发送邮件内容  sprintf_s(buf, 1500, "DATA/r/n");  send(sockfd, buf, strlen(buf), 0);  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout << "Send Mail Prepare Receive: " << rbuf << endl;  // 发送邮件内容，/r/n./r/n内容结束标记  sprintf_s(buf, 1500, "%s/r/n./r/n", body);  send(sockfd, buf, strlen(buf), 0);  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout << "Send Mail Receive: " << rbuf << endl;  // QUIT  sprintf_s(buf, 1500, "QUIT/r/n");  send(sockfd, buf, strlen(buf), 0);  memset(rbuf, 0, 1500);  recv(sockfd, rbuf, 1500, 0);  cout << "Quit Receive: " << rbuf << endl;  //清理工作  closesocket(sockfd);  WSACleanup();  return;}// 打开TCP Socket连接int OpenSocket(struct sockaddr *addr){  int sockfd = 0;  sockfd = socket(PF_INET, SOCK_STREAM, 0);  if (sockfd < 0)  {    cout << "Open sockfd(TCP) error!" << endl;    exit(-1);  }  if (connect(sockfd, addr, sizeof(struct sockaddr)) < 0)  {    cout << "Connect sockfd(TCP) error!" << endl;    exit(-1);  }  return sockfd;}

// SendMailTest.cpp#include "SendMail.h"int main(){  int num = 100;  string EmailContents = "From: /"lucy/"<xxxx@126.com>/r/n"               + string("To: /"dasiy/"<yyyy@126.com>/r/n")              + "Subject: Hello/r/n/r/n"               + "test sending variable" + to_string(num) + "/n";  char EmailTo[] = "yyyy@126.com";  //此处是送达的邮箱, 需和EmailContents里的保持一致  SendMail(EmailTo, EmailContents.c_str());  return 0;}