FtpWebRequest不会更改目录 [英] FtpWebRequest won't change directory

问题描述

嗨 我需要通过ftp连接到设备，将目录更改为系统，然后从中获取一些文件.我在下面使用代码

 reqFTP =(FtpWebRequest)WebRequest.Create
    (新 Uri("  + ftpServerIP + "  + fileName)))；
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
reqFTP.UseBinary =  true ;
reqFTP.UsePassive =  false ;
reqFTP.Credentials = 新 NetworkCredential(ftpUserID，ftpPassword);
FtpWebResponse响应=(FtpWebResponse)reqFTP.GetResponse();

我也尝试过这样的Uri

 Uri("  + ftpServerIP + "  + fileName)

但设备会回答:

550 Cannot find the file /system/filename.\r\n

:(但是，当我使用套接字编程并发送命令

 "  + directoryName 

我能够获取文件.FtpWebRequest有什么问题?

解决方案

尝试查看此MSDN修复文章. FIX:在FTP 7.5服务器上找不到文件时，您会收到一条错误消息:"550-系统找不到指定的文件" [^ ].
除此之外，请参见下面的链接.

1. 使用FtpWebRequest通过SSL进行FTP [ ^ ]
2. 错误550-无法访问文件 [ ^ ]

hi I need to connect to a device via ftp, change directory to system and then get some files from it. I use code below

reqFTP = (FtpWebRequest)WebRequest.Create
    (new Uri("ftp://" + ftpServerIP + "/system/" + fileName));
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
reqFTP.UseBinary = true;
reqFTP.UsePassive = false;
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

I also tried the Uri like this

Uri("ftp://" + ftpServerIP + "/%2fsystem/" + fileName)

but the device answers:

550 Cannot find the file /system/filename.\r\n

:( but when i use the socket programming and send the command

"CWD " + directoryName

I am able to get the file. what''s wrong with FtpWebRequest??

解决方案

Try to see this MSDN fix article.FIX: You receive an error message when no file is found on an FTP 7.5 server: "550-The system cannot find the file specified"[^].
In addition to this see the links below.

1. Using FtpWebRequest to do FTP over SSL[^]
2. Error 550 - Can''t Access File[^]

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