第四部分，私有方法至结束

第四部分，私有方法至结束

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--- 第四部分，私有方法至结束 (http://www.webasp.net/article/5/4002.htm)

-- 作者：未知
-- 发布日期： 2003-07-12

/// <summary>
 /// SMTP回应代码哈希表
 /// </summary>
 private void SMTPCodeAdd()
 {
 ErrCodeHT.Add("500","邮箱地址错误");
 ErrCodeHT.Add("501","参数格式错误");
 ErrCodeHT.Add("502","命令不可实现");
 ErrCodeHT.Add("503","服务器需要SMTP验证");
 ErrCodeHT.Add("504","命令参数不可实现");
 ErrCodeHT.Add("421","服务未就绪，关闭传输信道");
 ErrCodeHT.Add("450","要求的邮件操作未完成，邮箱不可用（例如，邮箱忙）");
 ErrCodeHT.Add("550","要求的邮件操作未完成，邮箱不可用（例如，邮箱未找到，或不可访问）");
 ErrCodeHT.Add("451","放弃要求的操作；处理过程中出错");
 ErrCodeHT.Add("551","用户非本地，请尝试<forward-path>");
 ErrCodeHT.Add("452","系统存储不足，要求的操作未执行");
 ErrCodeHT.Add("552","过量的存储分配，要求的操作未执行");
 ErrCodeHT.Add("553","邮箱名不可用，要求的操作未执行（例如邮箱格式错误）");
 ErrCodeHT.Add("432","需要一个密码转换");
 ErrCodeHT.Add("534","认证机制过于简单");
 ErrCodeHT.Add("538","当前请求的认证机制需要加密");
 ErrCodeHT.Add("454","临时认证失败");
 ErrCodeHT.Add("530","需要认证");

 RightCodeHT.Add("220","服务就绪");
 RightCodeHT.Add("250","要求的邮件操作完成");
 RightCodeHT.Add("251","用户非本地，将转发向<forward-path>");
 RightCodeHT.Add("354","开始邮件输入，以<enter>.<enter>结束");
 RightCodeHT.Add("221","服务关闭传输信道");
 RightCodeHT.Add("334","服务器响应验证Base64字符串");
 RightCodeHT.Add("235","验证成功");
 }

 /// <summary>
 /// 将字符串编码为Base64字符串
 /// </summary>
 /// <param name="estr">要编码的字符串</param>
 private string Base64Encode(string str)
 {
 byte[] barray;
 barray=Encoding.Default.GetBytes(str);
 return Convert.ToBase64String(barray);
 }

 /// <summary>
 /// 将Base64字符串解码为普通字符串
 /// </summary>
 /// <param name="dstr">要解码的字符串</param>
 private string Base64Decode(string str)
 {
 byte[] barray;
 barray=Convert.FromBase64String(str);
 return Encoding.Default.GetString(barray);
 }


 /// <summary>
 /// 得到上传附件的文件流
 /// </summary>
 /// <param name="FilePath">附件的绝对路径</param>
 private string GetStream(string FilePath)
 {
 //建立文件流对象
 System.IO.FileStream FileStr=new System.IO.FileStream(FilePath,System.IO.FileMode.Open);
 byte[] by=new byte[System.Convert.ToInt32(FileStr.Length)];
 FileStr.Read(by,0,by.Length);
 FileStr.Close();
 return(System.Convert.ToBase64String(by));
 }

 /// <summary>
 /// 发送SMTP命令
 /// </summary>
 private bool SendCommand(string str)
 {
 byte[] WriteBuffer;
 if(str==null||str.Trim()=="")
 {
 return true;
 }
 logs+=str;
 logs+=(enter+enter);
 htmllog+="";
 htmllog+=str;
 htmllog+="";
 WriteBuffer = Encoding.Default.GetBytes(str);
 try
 {
 ns.Write(WriteBuffer,0,WriteBuffer.Length);
 }
 catch
 {
 errmsg="网络连接错误";
 return false;
 }
 return true;
 }

 /// <summary>
 /// 接收SMTP服务器回应
 /// </summary>
 private string RecvResponse()
 {
 int StreamSize;
 string ReturnValue = "";
 byte[] ReadBuffer = new byte[1024] ;
 try
 {
 StreamSize=ns.Read(ReadBuffer,0,ReadBuffer.Length);
 }
 catch
 {
 errmsg="网络连接错误";
 return "false";
 }

 if (StreamSize==0)
 {
 return ReturnValue ;
 }
 else
 {
 ReturnValue = Encoding.Default.GetString(ReadBuffer).Substring(0,StreamSize);
 logs+=ReturnValue + enter + enter;
 htmllog+="";
 htmllog+=ReturnValue;
 htmllog+="";
 return ReturnValue;
 }
 }

 /// <summary>
 /// 与服务器交互，发送一条命令并接收回应。
 /// </summary>
 /// <param name="Command">一个要发送的命令</param>
 /// <param name="errstr">如果错误，要反馈的信息</param>
 private bool Dialog(string str,string errstr)
 {
 if(str==null||str.Trim()=="")
 {
 return true;
 }
 if(SendCommand(str))
 {
 string RR=RecvResponse();
 if(RR=="false")
 {
 return false;
 }
 string RRCode=RR.Substring(0,3);
 if(RightCodeHT[RRCode]!=null)
 {
 return true;
 }
 else
 {
 if(ErrCodeHT[RRCode]!=null)
 {
 errmsg+=(RRCode+ErrCodeHT[RRCode].ToString());
 errmsg+=enter;
 }
 else
 {
 errmsg+=RR;
 }
 errmsg+=errstr;
 return false;
 }
 }
 else
 {
 return false;
 }

 }

 /// <summary>
 /// 与服务器交互，发送一组命令并接收回应。
 /// </summary>

 private bool Dialog(string[] str,string errstr)
 {
 for(int i=0;i<str.Length;i++)
 {
 if(!Dialog(str[i],""))
 {
 errmsg+=enter;
 errmsg+=errstr;
 return false;
 }
 }

 return true;
 }

 //发送邮件
 private bool SendEmail()
 {
 //连接网络
 try
 {
 tc=new TcpClient(mailserver,mailserverport);
 }
 catch(Exception e)
 {
 errmsg=e.ToString();
 return false;
 }

 ns = tc.GetStream();
 SMTPCodeAdd();

 //验证网络连接是否正确
 if(RightCodeHT[RecvResponse().Substring(0,3)]==null)
 {
 errmsg="网络连接失败";
 return false;
 }

 string[] SendBuffer;
 string SendBufferstr;

 //进行SMTP验证
 if(ESmtp)
 {
 SendBuffer=new String[4];
 SendBuffer[0]="EHLO " + mailserver + enter;
 SendBuffer[1]="AUTH LOGIN" + enter;
 SendBuffer[2]=Base64Encode(username) + enter;
 SendBuffer[3]=Base64Encode(password) + enter;
 if(!Dialog(SendBuffer,"SMTP服务器验证失败，请核对用户名和密码。"))
 return false;
 }
 else
 {
 SendBufferstr="HELO " + mailserver + enter;
 if(!Dialog(SendBufferstr,""))
 return false;
 }

 //
 SendBufferstr="MAIL FROM:<" + From + ">" + enter;
 if(!Dialog(SendBufferstr,"发件人地址错误，或不能为空"))
 return false;

 //
 SendBuffer=new string[recipientmaxnum];
 for(int i=0;i<Recipient.Count;i++)
 {

 SendBuffer[i]="RCPT TO:<" + Recipient[i].ToString() +">" + enter;

 }
 if(!Dialog(SendBuffer,"收件人地址有误"))
 return false;

 SendBufferstr="DATA" + enter;
 if(!Dialog(SendBufferstr,""))
 return false;

 SendBufferstr="From:" + FromName + "<" + From +">" +enter;

 SendBufferstr += "To:=?"+Charset.ToUpper()+"?B?"+Base64Encode(RecipientName)+"?="+"<"+Recipient[0]+">"+enter;
 SendBufferstr+="CC:";
 for(int i=0;i<Recipient.Count;i++)
 {
 SendBufferstr+=Recipient[i].ToString() + "<" + Recipient[i].ToString() +">,";
 }
 SendBufferstr+=enter;

 if(Charset=="")
 {
 SendBufferstr+="Subject:" + Subject + enter;
 }
 else
 {
 SendBufferstr+="Subject:" + "=?" + Charset.ToUpper() + "?B?" + Base64Encode(Subject) +"?=" +enter;
 }

 SendBufferstr+="X-Priority:" + priority + enter;
 SendBufferstr+="X-MSMail-Priority:" + priority + enter;
 SendBufferstr+="Importance:" + priority + enter;
 SendBufferstr+="X-Mailer: Huolx.Pubclass" + enter;
 SendBufferstr+="MIME-Version: 1.0" + enter;

 SendBufferstr += "Content-Type: multipart/mixed;"+enter;//内容格式和分隔符
 SendBufferstr += " boundary=\"----=_NextPart_000_00D6_01C29593.AAB31770\""+enter;
 SendBufferstr += "------=_NextPart_000_00D6_01C29593.AAB31770"+enter;

 if(Html)
 {
 SendBufferstr+="Content-Type: text/html;" + enter;
 }
 else
 {
 SendBufferstr+="Content-Type: text/plain;" + enter;
 }

 if(Charset=="")
 {
 SendBufferstr+=" charset=\"iso-8859-1\"" + enter;
 }
 else
 {
 SendBufferstr+=" charset=\"" + Charset.ToLower() + "\"" + enter;
 }
 //SendBufferstr += "Content-Transfer-Encoding: base64"+enter;

 SendBufferstr+="Content-Transfer-Encoding: base64" + enter + enter;

 SendBufferstr+= Base64Encode(Body) + enter;
 if(Attachments.Count!=0)
 {
 foreach(string filepath in Attachments)
 {

 SendBufferstr += "------=_NextPart_000_00D6_01C29593.AAB31770"+enter;
 SendBufferstr += "Content-Type: application/octet-stream"+enter;
 SendBufferstr += " name=\"=?"+Charset.ToUpper()+"?B?"+Base64Encode(filepath.Substring(filepath.LastIndexOf("\\")+1))+"?=\""+enter;
 SendBufferstr += "Content-Transfer-Encoding: base64"+enter;
 SendBufferstr += "Content-Disposition: attachment;"+enter;
 SendBufferstr += " filename=\"=?"+Charset.ToUpper()+"?B?"+Base64Encode(filepath.Substring(filepath.LastIndexOf("\\")+1))+"?=\""+enter+enter;
 SendBufferstr += GetStream(filepath)+enter+enter;
 }
 }
 SendBufferstr += "------=_NextPart_000_00D6_01C29593.AAB31770--"+enter+enter;


 SendBufferstr += enter + "." + enter;

 if(!Dialog(SendBufferstr,"错误信件信息"))
 return false;

 SendBufferstr="QUIT" + enter;
 if(!Dialog(SendBufferstr,"断开连接时错误"))
 return false;

 ns.Close();
 tc.Close();
 return true;
 }


 }

}

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