VB.NET FTP登录类

Imports System
Imports System.Net
Imports System.IO
Imports System.Text
Imports System.Net.Sockets
Public Class Class1
    Public Const BLOCK_SIZE = 512
    Private Obj_ClientSocket As Socket
    Private Str_Domain As String = "XXX"          'ftp服务器地址
    Private Str_User As String = "XXX"                      'ftp登陆帐号
    Private Str_Password As String = "XXX"    'ftp登陆密码
    Private Int_RemotePort As Integer = 21              'ftp服务器端口
    Private Int_Reply,Int_Bytes As Int32
    Private Str_Message,Str_Reply As String
    Private Byte_Buffer(BLOCK_SIZE) As Byte
    Private ASCII As Encoding = Encoding.ASCII

    Public Function Logined() As Boolean

        Obj_ClientSocket = New Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp)
        Dim x_lob As New IPEndPoint(Dns.GetHostEntry(Str_Domain).AddressList(0),Int_RemotePort)
        Try
            Obj_ClientSocket.Connect(x_lob)
        Catch ex As Exception
            MsgBox("无法登陆远程Ftp服务器")
        End Try
        Str_Message = ""
        Str_Reply = ServerReply()
        Int_Reply = Int32.Parse(Str_Reply.Substring(0,3))
        If (Int_Reply <> 220) Then
            MsgBox(Str_Reply.Substring(4))
        End If

        SendCommand("USER " & Str_User)
        Str_Reply = ServerReply(True)
        Int_Reply = Int32.Parse(Str_Reply.Substring(0,3))
        If (Not (Int_Reply = 331 Or Int_Reply = 230)) Then
            MsgBox(Str_Reply.Substring(4))
            Return False
        End If

        If (Int_Reply <> 230) Then
            SendCommand("PASS " & Str_Password)
            Str_Reply = ServerReply(True)
            Int_Reply = Int32.Parse(Str_Reply.Substring(0,3))
            If (Not (Int_Reply = 230 Or Int_Reply = 202)) Then
                MsgBox(Str_Reply.Substring(4))
                Return False
            End If
        End If

        Return True

    End Function

    Private Function ServerReply(Optional ByVal Bool_Clear As Boolean = False) As String

        Dim Sep As Char = ControlChars.Lf
        Dim Arr_Msg() As String
        If (Bool_Clear) Then
            Str_Message = ""
        End If
        Do While (True)
            Array.Clear(Byte_Buffer,BLOCK_SIZE)
            Int_Bytes = Obj_ClientSocket.Receive(Byte_Buffer,Byte_Buffer.Length,0)
            Str_Message += ASCII.GetString(Byte_Buffer,Int_Bytes)
            If (Int_Bytes < Byte_Buffer.Length) Then
                Exit Do
            End If
        Loop
        Arr_Msg = Str_Message.Split(Sep)
        If (Str_Message.Length > 2) Then
            Str_Message = Arr_Msg(Arr_Msg.Length - 2)
        Else
            Str_Message = Arr_Msg(0)
        End If
        If (Not (Str_Message.Substring(3,1).Equals(" "))) Then
            Return ServerReply(True)
        End If
        Return Str_Message

    End Function


    Private Sub SendCommand(ByVal Str_Command As String)

        Str_Command = Str_Command & ControlChars.CrLf
        Dim cmdbytes As Byte() = ASCII.GetBytes(Str_Command)
        Obj_ClientSocket.Send(cmdbytes,cmdbytes.Length,0)

    End Sub

End Class

网上找到的一个VB.NET的FTP类文件，能够不错的兼容使用，但是还是存在一些问题，现在整合在AspCms内容管理器上，在寒假里希望能进行一下改进，加入上传下载的功能。

（编辑：李大同）

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