VB学习:MX记录获取组件

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　　   源码是老外的，俺做了点修改，写成了dll
 
  方法：

  Public Function GetDNSinfo() As String
 
  获取dns信息
 
  Public Function MX_Query(DNS_Addr As String, ByVal Domain_Addr As String) As String

  获取mx最佳记录，

  dns_addr,域名解析服务器，可以用getdnsinfo获取，也可以用nslookup命令

  domain_addr，想要获取邮件服务器的域名，如163.com ,hotmail.com

  http://www.aspcdrom.com/down/mxquery.rar

  VERSION 1.0 CLASS
  BEGIN
  MultiUse = -1 'True
  Persistable = 0 'NotPersistable
  DataBindingBehavior = 0 'vbNone
  DataSourceBehavior = 0 'vbNone
  MTSTransactionMode = 0 'NotAnMTSObject
  END
  Attribute VB_Name = "mxquery"
  Attribute VB_GlobalNameSpace = False
  Attribute VB_Creatable = True
  Attribute VB_PredeclaredId = False
  Attribute VB_Exposed = True
  Option Explicit

  Private WithEvents objWinSock As MSWinsockLib.Winsock
  Attribute objWinSock.VB_VarHelpID = -1

 Private Const ERROR_BUFFER_OVERFLOW = 111

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