VB.Net实现Ftp上传的方法

调用方式：

UploadFile("d:\lob.rar", False) '  2个参数分别为 准备上传的文件完整路径、是否续传

功能函数：

 Public Sub UploadFile(ByVal Str_LocalFileName As String, ByVal Bool_Resume As Boolean)

        Dim LobSocket As Socket
        Dim offset As Long
        Dim input As FileStream
        Dim bFileNotFound As Boolean
        If (Not Logined()) Then  
            Logined()
        End If
        LobSocket = CreateDataSocket()
        offset = 0
        If (Bool_Resume) Then
            Try
                SetBinaryMode(True)
                offset = GetFileSize(Str_LocalFileName)
            Catch ex As Exception
                offset = 0
            End Try
        End If
        If (offset > 0) Then
            SendCommand("REST " & offset)
            If (Int_Reply <> 350) Then
                offset = 0
            End If
        End If
        SendCommand("STOR " & Path.GetFileName(Str_LocalFileName))
        Str_Reply = ServerReply(True)
        Int_Reply = Int32.Parse(Str_Reply.Substring(0, 3))
        If (Not (Int_Reply = 125 Or Int_Reply = 150)) Then
            MsgBox(Str_Reply.Substring(4))
        End If
        bFileNotFound = False
        If (File.Exists(Str_LocalFileName)) Then
            input = New FileStream(Str_LocalFileName, FileMode.Open)
            If (offset <> 0) Then
                input.Seek(offset, SeekOrigin.Begin)
            End If
            Int_Bytes = input.Read(Byte_Buffer, 0, Byte_Buffer.Length)
            Do While (Int_Bytes > 0)
                LobSocket.Send(Byte_Buffer, Int_Bytes, 0)
                Int_Bytes = input.Read(Byte_Buffer, 0, Byte_Buffer.Length)
            Loop
            input.Close()
        Else
            bFileNotFound = True
        End If
        If (LobSocket.Connected) Then
            LobSocket.Close()
        End If
        If (bFileNotFound) Then
            MsgBox(Str_LocalFileName & "文件未找到，无法上传")
        End If
        Str_Reply = ServerReply(True)
        Int_Reply = Int32.Parse(Str_Reply.Substring(0, 3))
        If (Not (Int_Reply = 226 Or Int_Reply = 250)) Then
            MsgBox(Str_Reply.Substring(4))
        End If

    End Sub

    Public Function GetFileSize(ByVal sFileName As String) As Long

        Dim size As Long
        SendCommand("SIZE " & sFileName)
        size = 0
        Str_Reply = ServerReply(True)
        Int_Reply = Int32.Parse(Str_Reply.Substring(0, 3))
        If (Int_Reply = 213) Then
            size = Int64.Parse(Str_Reply.Substring(4))
        Else
            MsgBox(Str_Reply.Substring(4))
        End If
        Return size

    End Function