smtp邮件发送客户端c++

[yfyf4455]

正在用Visual C++6.0开发平台实现基于SMTP协议邮件发送程序。应用的是MFC AppWizard [exe] 基于基本对话框的Windows Sockets编程。

现在已经可以向收件人发送邮件。

问题是：

但若以附件形式发送邮件，在接收方没有附件显示，无法下载附件。

并且，抄送和暗送功能没有实现。

请大家帮帮忙！先谢谢了^_^

[yfyf4455]

那你就随便写一个吧！

[ok1234567]

抄送和暗送仅仅是重复的 RCPT TO: 命令
附件则需要处理：multipart/mixed; boundary
以定义边界（通常base64编码）的方式发送数据

[wutaihua]

你参考下这个代码吧，可以用的

#include <winsock2.h>
#include <string.h>
#include <stdio.h>

const int  BASE64_MAXLINE = 76;
const char EOL[] = "\r\n";
const char BASE64_TAB[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
      "abcdefghijklmnopqrstuvwxyz0123456789+/";
const char HEADER[] =
  "HELO support.com\r\n"
  //"AUTH LOGIN\r\n" //+ BASE64 USER + BASE64 PASS
  "MAIL FROM: [e-mail]\r\n"
  "RCPT TO: [e-mail]\r\n"
  "DATA\r\n"
  "FROM: [e-mail]\r\n"
  "TO: [e-mail]\r\n"
  "SUBJECT: this is a test\r\n"
  "Date: 2002-5-14\r\n"
  "X-Mailer: shadowstar's mailer\r\n"
  "MIME-Version: 1.0\r\n"
  "Content-type: multipart/mixed; boundary=\"#BOUNDARY#\"\r\n"
  //"Content-Type: text/plain; charset=gb2312\r\n"
  "\r\n";
const char CONTENT[] =
  "\r\n--#BOUNDARY#\r\n"
  "Content-Type: text/plain; charset=gb2312\r\n"
  "Content-Transfer-Encoding: quoted-printable\r\n"
  "\r\n"
  "/*************************************************************"
  " *  smtp.cpp - Use SMTP to send an eMail with an Attachment and verify  *"
  " *  Copyright (C) 2001-2002 by ShadowStar.                                          *"
  " *  Use and modify freely.                                                                      *"
  " *  http://shadowstar.126.com/                                                               *"
  " *************************************************************"
  " */\r\n"
  "\r\n";
const char ATT_HEADER[] =
  "\r\n--#BOUNDARY#\r\n"
  "Content-Type: application/octet-stream; name=smtp.exe\r\n"
  "Content-Disposition: attachment; filename=smtp.exe\r\n"
  "Content-Transfer-Encoding: base64\r\n"
  "\r\n";

//---------------------------------------------------------------------------
int ANSIToBase64(const char *szInANSI, int nInLen, char *szOutBase64, int nOutLen);

int main(int argc, char* argv[])
{
 WSADATA wsaData;
 int  SockFD;
 struct sockaddr_in ServAddr;
 char  buf[0x100];
 int     x;
 FILE    *fp;
 char    *aatt = new char[0x400000];
 char *batt = new char[0x555556];

 WSAStartup(MAKEWORD(2,2), &wsaData);

 LPHOSTENT pHost = gethostbyname("172.16.234.111");
 SockFD = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 ServAddr.sin_family = AF_INET;
 ServAddr.sin_addr.s_addr = *(ULONG *)pHost->h_addr_list[0];
 ServAddr.sin_port = htons(25);

 connect(SockFD, (struct sockaddr *)&ServAddr, sizeof(ServAddr));
 //send HEADER
 send(SockFD, HEADER, strlen(HEADER), 0);
 //send CONTENT
 send(SockFD, CONTENT, strlen(CONTENT), 0);
 //send ATT_HEADER
 send(SockFD, ATT_HEADER, strlen(ATT_HEADER), 0);
 //read attachment
 fp = fopen(argv[0], "rb");
 fseek(fp, 0, 2);
 x = ftell(fp);
 if (x > 0x400000)
  x = 0;
 rewind(fp);
 fread(aatt, x, 1, fp);
 fclose(fp);
 x = ANSIToBase64(aatt, x, batt, 0x555556);
 //send base64 attachment
 send(SockFD, batt, x, 0);

 send(SockFD, ".\r\n", strlen(".\r\n"), 0);   //end
 send(SockFD, "QUIT\r\n", strlen("QUIT\r\n"), 0); //quit

 closesocket(SockFD);
 WSACleanup();

 delete []aatt;
 delete []batt;
 return 0;
}
//---------------------------------------------------------------------------
int ANSIToBase64(const char *szInANSI, int nInLen, char *szOutBase64, int nOutLen)
{
 //Input Parameter validation
 if ((szInANSI == NULL) || (nInLen == 0) || (szOutBase64 == NULL) || (nOutLen == 0))
  return 0;
 if (nOutLen < (nInLen*4/3 + 1 + nInLen*4/3/BASE64_MAXLINE*2 + 1 + 4))
  return 0;

 //Set up the parameters prior to the main encoding loop
 int nInPos  = 0;
 int nOutPos = 0;
 int nLineLen = 0;
 int c1, c2, c3;
 int i;

 // Get three characters at a time from the input buffer and encode them
 for (i=0; i<nInLen/3; ++i)
 {
  //Get the next 2 characters
  c1 = szInANSI[nInPos++] & 0xFF;
  c2 = szInANSI[nInPos++] & 0xFF;
  c3 = szInANSI[nInPos++] & 0xFF;

  //Encode into the 4 6 bit characters
  szOutBase64[nOutPos++] = BASE64_TAB[c1 >> 2];
  szOutBase64[nOutPos++] = BASE64_TAB[((c1 << 4) | (c2 >> 4)) & 0x3F];
  szOutBase64[nOutPos++] = BASE64_TAB[((c2 << 2) | (c3 >> 6)) & 0x3F];
  szOutBase64[nOutPos++] = BASE64_TAB[c3 & 0x3F];
  nLineLen += 4;

  //Handle the case where we have gone over the max line boundary
  if (nLineLen > BASE64_MAXLINE - 4)
  {
   szOutBase64[nOutPos++] = EOL[0];
   szOutBase64[nOutPos++] = EOL[1];
   nLineLen = 0;
  }
 }

 // Encode the remaining one or two characters in the input buffer
 switch (nInLen % 3)
 {
  case 0:
  {
   szOutBase64[nOutPos++] = EOL[0];
   szOutBase64[nOutPos++] = EOL[1];
   break;
  }
  case 1:
  {
   c1 = szInANSI[nInPos] & 0xFF;
   szOutBase64[nOutPos++] = BASE64_TAB[(c1 & 0xFC) >> 2];
   szOutBase64[nOutPos++] = BASE64_TAB[((c1 & 0x03) << 4)];
   szOutBase64[nOutPos++] = '=';
   szOutBase64[nOutPos++] = '=';
   szOutBase64[nOutPos++] = EOL[0];
   szOutBase64[nOutPos++] = EOL[1];
   break;
  }
  case 2:
  {
   c1 = szInANSI[nInPos++] & 0xFF;
   c2 = szInANSI[nInPos] & 0xFF;
   szOutBase64[nOutPos++] = BASE64_TAB[(c1 & 0xFC) >> 2];
   szOutBase64[nOutPos++] = BASE64_TAB[((c1 & 0x03) << 4) | ((c2 & 0xF0) >> 4)];
   szOutBase64[nOutPos++] = BASE64_TAB[((c2 & 0x0F) << 2)];
   szOutBase64[nOutPos++] = '=';
   szOutBase64[nOutPos++] = EOL[0];
   szOutBase64[nOutPos++] = EOL[1];
   break;
  }
  default:
  {
   return 0;
  }
 }

 szOutBase64[nOutPos] = 0;

 return nOutPos;
}

[wutaihua]

我写了一个dll，也是实现了这个功能了，但是跟楼主差不多，关键是我没有可以去写这个

[jevinss]

mark

[yfyf4455]

谢谢你的回答。^_^

可是...

还是不太明白怎么具体的去实现。

[yfyf4455]

你能解释一下基于SMTP协议的邮件发送客户端是工作原理、工作过程吗？比如点击“发送”按钮后会发生什么事情，哪些函数是怎么配合彼此工作的....

[僵哥]

还是看看SMTP/ESMTP的资料吧http://www.ietf.org/rfc/rfc0821.txthttp://www.ietf.org/rfc/rfc2821.txt

[僵哥]

中文:http://www.longen.org/s-z/details~z/smtp.htm
http://dev.21tx.com/2002/11/19/10070.html

[peecars]

学习...

[luckyboy101]

用Jmail组件吧，可以轻松实现邮件发送接收等各种功能

[yjgx007]

理解协议写数据结构.

[subyg_0009]

学习...