通过 FTP 上传文件 - 服务器返回错误 (550) 文件不可用，找不到文件答案

【问题标题】：Upload file via FTP - Server returned error (550) File is unavailable, cannot find file通过 FTP 上传文件 - 服务器返回错误 (550) 文件不可用，找不到文件
【发布时间】：2009-10-31 17:59:06
【问题描述】：

我正在尝试通过 FTP 从我的本地计算机将文件上传到 FTP 服务器，该服务器目前也在我的本地计算机上。我有这个正在打电话的潜艇：

    Public Sub UploadFTPFile(ByVal ftpservername, ByVal fullfilepath, ByVal filename, ByVal username, ByVal password)

    Dim clsRequest As System.Net.FtpWebRequest = _
    DirectCast(System.Net.WebRequest.Create("ftp://" & ftpservername & "/" & filename), System.Net.FtpWebRequest)
    clsRequest.Credentials = New System.Net.NetworkCredential(username, password)
    clsRequest.Method = System.Net.WebRequestMethods.Ftp.UploadFile

    clsRequest.KeepAlive = False

    ' read in file...
    Dim bFile() As Byte = System.IO.File.ReadAllBytes(fullfilepath)

    ' upload file...
    Dim clsStream As System.IO.Stream = _
        clsRequest.GetRequestStream()
    clsStream.Write(bFile, 0, bFile.Length)
    clsStream.Close()
    clsStream.Dispose()
End Sub

当调用 sub 时，我是这样做的：

UploadFTPFile("192.168.1.3/Temp", selectedSoundFileLong, OpenFileDialog.SafeFileName, "", "")

也就是说，在Sub里，这个字符串：

DirectCast(System.Net.WebRequest.Create("ftp://" & ftpservername & "/" & filename), System.Net.FtpWebRequest)

，创建以下内容：

    DirectCast(System.Net.WebRequest.Create("ftp://192.168.1.3/Temp/test.mp3"), System.Net.FtpWebRequest)

并且在 sub 中的这一行：

        Dim clsStream As System.IO.Stream = _
        clsRequest.GetRequestStream()

出现此错误：

The remote server returned an error: (550) File unavailable

这可能是什么原因？我正在使用免费软件 Golder FTP Server 运行 FTP 服务器。我认为它设置正确，因为使用与上面使用 Windows Explorer 完全相同的字符串连接到 FTP 服务器效果很好。

【问题讨论】：

标签： c# vb.net ftp ftpwebrequest

【解决方案1】：

您确定 webRequest 字符串中没有多余的空格吗？如果字符串碰巧像“ftp://192.168.1.3/Temp/test.mp3”，我相信您会收到此错误另外，请检查以确保您具有写入该服务器的正确权限。此外，请确保您的文件是 test.mp3 而不是 test.MP3。

【讨论】：

文件名中根本没有空格。写入服务器的权限是解决方案:)

【解决方案2】：

尝试翻转UsePassive 属性。控制和数据使用different ports in FTP，有可能您在控制端口上通过，但在数据端口上以某种方式被阻塞。

【讨论】：

Thanx，我试过了，它似乎成功了 :) 尽管它不能单独工作，但我需要在 FTP 服务器上设置一些设置以允许传入流量。现在工作，谢谢！ :)
顺便说一句，知道如何让进度条显示进度吗？

【解决方案3】：

550 是 System.Net.FtpWebRequest 连接错误代码。

另外，您还没有正确构建您的 FTP，请查看我的 FTP 类：它非常简单。

Public Class FTP
        '-------------------------[BroCode]--------------------------
        '----------------------------FTP-----------------------------
        Private _credentials As System.Net.NetworkCredential
        Sub New(ByVal _FTPUser As String, ByVal _FTPPass As String)
            setCredentials(_FTPUser, _FTPPass)
        End Sub
        Public Sub UploadFile(ByVal _FileName As String, ByVal _UploadPath As String)
            Dim _FileInfo As New System.IO.FileInfo(_FileName)
            Dim _FtpWebRequest As System.Net.FtpWebRequest = CType(System.Net.FtpWebRequest.Create(New Uri(_UploadPath)), System.Net.FtpWebRequest)
            _FtpWebRequest.Credentials = _credentials
            _FtpWebRequest.KeepAlive = False
            _FtpWebRequest.Timeout = 20000
            _FtpWebRequest.Method = System.Net.WebRequestMethods.Ftp.UploadFile
            _FtpWebRequest.UseBinary = True
            _FtpWebRequest.ContentLength = _FileInfo.Length
            Dim buffLength As Integer = 2048
            Dim buff(buffLength - 1) As Byte
            Dim _FileStream As System.IO.FileStream = _FileInfo.OpenRead()
            Try
                Dim _Stream As System.IO.Stream = _FtpWebRequest.GetRequestStream()
                Dim contentLen As Integer = _FileStream.Read(buff, 0, buffLength)
                Do While contentLen <> 0
                    _Stream.Write(buff, 0, contentLen)
                    contentLen = _FileStream.Read(buff, 0, buffLength)
                Loop
                _Stream.Close()
                _Stream.Dispose()
                _FileStream.Close()
                _FileStream.Dispose()
            Catch ex As Exception
                MessageBox.Show(ex.Message, "Upload Error: ", MessageBoxButtons.OK, MessageBoxIcon.Error)
            End Try
        End Sub
        Public Sub DownloadFile(ByVal _FileName As String, ByVal _ftpDownloadPath As String)
            Try
                Dim _request As System.Net.FtpWebRequest = System.Net.WebRequest.Create(_ftpDownloadPath)
                _request.KeepAlive = False
                _request.Method = System.Net.WebRequestMethods.Ftp.DownloadFile
                _request.Credentials = _credentials
                Dim _response As System.Net.FtpWebResponse = _request.GetResponse()
                Dim responseStream As System.IO.Stream = _response.GetResponseStream()
                Dim fs As New System.IO.FileStream(_FileName, System.IO.FileMode.Create)
                responseStream.CopyTo(fs)
                responseStream.Close()
                _response.Close()
            Catch ex As Exception
                MessageBox.Show(ex.Message, "Download Error: ", MessageBoxButtons.OK, MessageBoxIcon.Error)
            End Try
        End Sub
        Public Function GetDirectory(ByVal _ftpPath As String) As List(Of String)
            Dim ret As New List(Of String)
            Try
                Dim _request As System.Net.FtpWebRequest = System.Net.WebRequest.Create(_ftpPath)
                _request.KeepAlive = False
                _request.Method = System.Net.WebRequestMethods.Ftp.ListDirectoryDetails
                _request.Credentials = _credentials
                Dim _response As System.Net.FtpWebResponse = _request.GetResponse()
                Dim responseStream As System.IO.Stream = _response.GetResponseStream()
                Dim _reader As System.IO.StreamReader = New System.IO.StreamReader(responseStream)
                Dim FileData As String = _reader.ReadToEnd
                Dim Lines() As String = FileData.Split(New String() {Environment.NewLine}, StringSplitOptions.RemoveEmptyEntries)
                For Each l As String In Lines
                    ret.Add(l)
                Next
                _reader.Close()
                _response.Close()
            Catch ex As Exception
                MessageBox.Show(ex.Message, "Directory Fetch Error: ", MessageBoxButtons.OK, MessageBoxIcon.Error)
            End Try
            Return ret
        End Function

        Private Sub setCredentials(ByVal _FTPUser As String, ByVal _FTPPass As String)
            _credentials = New System.Net.NetworkCredential(_FTPUser, _FTPPass)
        End Sub
    End Class

初始化：

Dim ftp As New FORM.FTP("username", "password")

ftp.UploadFile("c:\file.jpeg", "ftp://domain/file.jpeg")

ftp.DownloadFile("c:\file.jpeg", "ftp://ftp://domain/file.jpeg")

Dim directory As List(Of String) = ftp.GetDirectory("ftp://ftp.domain.net/")
        ListBox1.Items.Clear()
        For Each item As String In directory
            ListBox1.Items.Add(item)
        Next

【讨论】：