如何用smtp实现带附件的邮件传输

Question

就是在向服务器发送DATA\r\n之后,发送格式是什么?

Answer 1

CString sData;
sData.Format("DATA\r\n");
if(send(sockMail,(LPCTSTR)sData,sData.GetLength(),0)==SOCKET_ERROR)
{
MessageBox(NULL,_T("套接字错误"),NULL,NULL);
return false;
}
if(__getresponce(354)==false)
{
MessageBox(NULL,_T("服务器不能接收数据"),NULL,NULL);
return false;
}
CString content="";
content= "From: cky <"+mailfrom+">\r\n";
content+="To: <"+recvto+">\r\n";
content+="Subject: this is a test\r\n";
content+="Date:";
CTime tmNow=tmNow.GetCurrentTime();
content+=tmNow.Format("%a,%d %b %y %H:%M:%S%Z");
content+="\r\n\r\nMIME-Version: 1.0\r\n";
content+="Content-type: multipart/mixed;\r\n\tboundary=\"----=_NextPart_000_0003_01C60A6E.5B1D3940\"\r\n";
content+="X-Priority: 3\r\nX-MSMail-Priority: Normal\r\nX-Mailer: Microsoft Outlook Express 6.00.2900.2180\r\n";
content+="X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180\r\n"; content+="\r\n";
content+="This is a multi-part message in MIME format.\r\n\r\n";
// content+="\r\n.\r\n"; content+="----=_NextPart_000_0003_01C60A6E.5B1D3940\r\n";
content+="Content-type: text/plain;\r\n";
content+="\tcharset=\"gb2312\" \r\nContent-Transfer-Encoding: base64\r\n";
content+="\r\n";
CString temp;
Base64Encrypt(szText,temp);
content+=temp;
content+="\r\n\r\n";
content+="----=_NextPart_000_0003_01C60A6E.5B1D3940\r\n";
content+="Content-Type: text/plain;\r\n name=\"cmd.text\"\r\nContent-Transfer-Encoding: quoted-printable\r\nContent-Disposition: attachment;\r\n filename=\"cmd.text\"\r\n";
content+="\r\nafcvasdfsdfasdfasdfasdfasdf\r\n";
content+="\r\n";
content+="----=_NextPart_000_0003_01C60A6E.5B1D3940--\r\n.\r\n"; if(SOCKET_ERROR==send(sockMail,content,content.GetLength(),0))
{
MessageBox(NULL,_T("socket error"),NULL,NULL);
closesocket(sockMail);
return false;
}

Answer 2

自己没写过，你可以参考
http://www.vckbase.com/document/viewdoc/?id=703

Answer 3

在RFC上.
RFC 821 - Simple Mail Transfer Protocol (SMTP)
RFC 2821 - Simple Mail Transfer Protocol
RFC 1869 - SMTP Service Extensions (ESMTP)网址:
http://www.ietf.org/rfc.html