VB.Net实现Ftp下载的方法
调用方式：DownloadFile("abc.rar","d:\abc.rar","Flase") '3个参数分别为远程ftp的文件名、保存到本地的完整路径、是否续传
功能函数：
Public Sub DownloadFile(ByVal Str_RemoteFileName As String, _
ByVal Str_LocalFileName As String, _
ByVal Bool_Resume As Boolean)
Dim Data_St As Stream
Dim output As FileStream
Dim LobSocket As Socket
Dim offset, npos As Long
If (Not Logined()) Then
Logined()
End If
SetBinaryMode(True)
If (Str_LocalFileName.Equals("")) Then
Str_LocalFileName = Str_RemoteFileName
End If
If (Not (File.Exists(Str_LocalFileName))) Then
Data_St = File.Create(Str_LocalFileName)
Data_St.Close()
End If
output = New FileStream(Str_LocalFileName, FileMode.Open)
LobSocket = CreateDataSocket()
offset = 0
If (Bool_Resume) Then
offset = output.Length
If (offset > 0) Then
SendCommand("REST " & offset)
Str_Reply = ServerReply(True)
Int_Reply = Int32.Parse(Str_Reply.Substring(0, 3))
If (Int_Reply350) Then
offset = 0
End If
End If
If (offset > 0) Then
npos = output.Seek(offset, SeekOrigin.Begin)
End If
End If
SendCommand("RETR " & Str_RemoteFileName)
Str_Reply = ServerReply(True)
Int_Reply = Int32.Parse(Str_Reply.Substring(0, 3))
If (Not (Int_Reply = 150 Or Int_Reply = 125)) Then
MsgBox(Str_Reply.Substring(4))
End If
Do While (True)
Array.Clear(Byte_Buffer, 0, Byte_Buffer.Length)
Int_Bytes = LobSocket.Receive(Byte_Buffer, Byte_Buffer.Length, 0)
output.Write(Byte_Buffer, 0, Int_Bytes)
If (Int_Bytes
页:
[1]